07 Nov 13:36
by Jakob Wolansky,
Cedric Hoffmann,
Michel Panhans,
Louis Conrad Winkler,
Felix Talnack,
Sebastian Hutsch,
Huotian Zhang,
Anton Kirch,
Kaila M. Yallum,
Hannes Friedrich,
Jonas Kublitski,
Feng Gao,
Donato Spoltore,
Stefan C. B. Mannsfeld,
Frank Ortmann,
Natalie Banerji,
Karl Leo,
Johannes Benduhn
A fully thermally evaporated single-component organic photodetector is demonstrated with high photoresponsivity at zero bias, resulting in a specific detectivity of 1 · 1013 Jones based on noise measurements. Ultrafast charge generation within one picosecond is observed in the neat photoactive material, which is attributed to the strong electronic coupling of the molecular exciton and charge-transfer states in the small molecule.
Abstract
Typically, organic solar cells (OSCs) and photodetectors (OPDs) comprise an electron donating and accepting material to facilitate efficient charge carrier generation. This approach has proven successful in achieving high-performance devices but has several drawbacks for upscaling and stability. This study presents a fully vacuum-deposited single-component OPD, employing the neat oligothiophene derivative DCV2-5T in the photoactive layer. Free charge carriers are generated with an internal quantum efficiency of 20 % at zero bias. By optimizing the device structure, a very low dark current of 3.4 · 10−11 A cm−2 at −0.1 V is achieved, comparable to the dark current of state-of-the-art bulk heterojunction OPDs. This optimization results in specific detectivities of 1· 1013 Jones (based on noise measurements), accompanied by a fast photoresponse (f
-3dB = 200 kHz) and a broad linear dynamic range (> 150 dB). Ultrafast transient absorption spectroscopy unveils that charge carriers are already formed at very short time scales (< 1 ps). The surprisingly efficient bulk charge generation mechanism is attributed to a strong electronic coupling of the molecular exciton and charge transfer states. This work demonstrates the very high performance of single-component OPDs and proves that this novel device design is a successful strategy for highly efficient, morphological stable and easily manufacturable devices.
07 Nov 13:20
Mater. Adv., 2024, Advance Article
DOI: 10.1039/D4MA00170B, Paper
Open Access
Bradley P. Kirk, Amira R. Alghamdi, Matthew J. Griffith, Xun Pan, Martyn Jevric, David A. Lewis, Gunther G. Andersson, Mats R. Andersson
Thermal degradation of active layer blend of PPDT2FBT:PCBM deposited via slot-die coating was investigated at 85 °C and 120 °C. The results clearly shows that care must be taken when performing accelerated ageing of OPV materials.
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07 Nov 13:20
Mater. Adv., 2024, 5,3198-3206
DOI: 10.1039/D3MA00871A, Paper
Open Access
Pavel Šimon, Jakub Štrojsa, Milan Klikar, Zuzana Burešová, Aleš Růžička, Jiří Zelenka, Jiří Kulhánek, Jiří Tydlitát
Two novel emissive chromophores based on triphenylamine and carbazole have been designed, prepared and further utilized as comonomers towards end-capped emissive colourless polyimides.
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07 Nov 09:42
by Houssein El Housseiny, Suzanne Fery-Forgues, Marc Ternisien, David Buso, Georges Zissis, and Cédric Renaud
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c13006
07 Nov 09:42
by Marko Jošt, Žan Ajdič, and Marko Topič
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c14736
07 Nov 09:41
by Ya-Nan Zhang, Shuai Feng, Shi-Hua Zhao, Bo-Wen Gao, and Cheng-Xiang Wang
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c14812
07 Nov 05:55
by Qing Sun,
Xiangxin Meng,
Gang Liu,
Shaocong Duan,
Die Hu,
Bo Shen,
Bonan Kang,
S. Ravi P. Silva
High efficient and stable rigid and flexible n-i-p perovskite solar cells are developed through incorporating 2,5-Furandicarboxylic acid multifunctional intermediate layer between SnO2 layer and perovskite layer to modify the SnO2 surface and passivate the buried interface of perovskite, which achieved high PCE of 24.5% (rigid) and 22.1% (flexible) with excellent ambient and mechanical stability.
Abstract
Flexible perovskite solar cells (PSCs) have received great attention due to their low weight, high power ratio, and potential applications in wearable electronic products. The efficiency and stability of flexible PSCs are directly affected by the carrier extraction and transport capabilities of electron transport layer. Herein, efficient flexible PSCs are prepared through incorporating 2,5-Furandicarboxylic acid (FDCA) multifunctional intermediate layer between tin oxide (SnO2) and perovskite, which can effectively eliminate defects at the interfacial to increase the electron mobility of the SnO2 layer, modify the surface of SnO2 to shift the conduction band upward to improve interface charge extraction, passivate the buried interface of perovskite to induce larger perovskite crystal growth, and establish a bridge between SnO2 and perovskite to improve charge collection efficiency. As a result, the rigid PSCs with FDCA display a champion power conversion efficiency (PCE) of 24.53% with a high open circuit voltage (V
OC) of 1.204 V. Furthermore, the flexible device with FDCA achieves a high PCE of 22.10%, and preserve 90% of its initial PCE after aging for 500 h at ambient condition without encapsulation, and maintain 81% of its original PCE after 10,000 bending cycles.
07 Nov 05:53
by Chunyu Liu,
Dezhong Zhang,
Jiayun Sun,
Dongyu Li,
Qi Xiong,
Benzheng Lyu,
Wenbin Guo,
Wallace C. H. Choy
A multi-functional polymeric-termination surface is constructed on the perovskite films to achieve highly efficient and mechanically stable flexible perovskite light-emitting diodes. The polymeric-termination surface with functional groups and polymer synergetic effects can improve the optical, electrical, and mechanical properties of perovskite films simultaneously. A record efficiency and obviously improved flexible stability of devices are achieved.
Abstract
Flexible perovskite light-emitting diodes (f-PeLEDs) have attracted increasing interest to realize true-color, low-cost, and light-weight wearable optoelectronic and flexible display applications. However, their external quantum efficiency (EQE) and mechanical stability lag far behind because of the inherent surface and brittle issues of polycrystalline perovskite films. In this work, a multi-functional polymeric-termination surface of perovskite film is constructed for achieving efficient and mechanically stable f-PeLEDs. It takes the roles to not only reduce defects through equipping coordination groups to improve emission properties, but also optimize film morphology and eliminate pinholes to solve the long-standing issue of leakage current. Meanwhile, the polymeric-termination surface with anchoring points and polymeric soft chains on perovskites demonstrates synergetic effects beyond the corresponding functional group-only or polymer-only strategies in reducing the Young's modulus and improving the mechanical flexibility. Ultimately, the record EQE of 22.1% and significantly enhanced mechanical stability of maintaining 82% of the initial performance after 2000 bending cycles with radius of 5 mm are achieved in pure-green f-PeLEDs. The work paves the way for the development of high-performance flexible optoelectronic devices.
07 Nov 05:52
by Md Arafat Mahmud,
Jianghui Zheng,
Jia‐Fu Chang,
Guoliang Wang,
Chwenhaw Liao,
Md Habibur Rahman,
Walia Binte Tarique,
Shi Tang,
Jueming Bing,
Christopher G. Bailey,
Zhuofeng Li,
Limei Yang,
Nina Novikova,
Tik Lun Leung,
Hongjun Chen,
Jianpeng Yi,
Runmin Tao,
Marko Jankovec,
Stephen P. Bremner,
Julie Cairney,
Ashraf Uddin,
Hieu T. Nguyen,
Trevor Smith,
Chu‐Chen Chueh,
Anita W. Y. Ho‐Baillie
Halogenated polycyclic aromatic hydrocarbon has a dipole moment, useful for treating hole selective layer to provide interface modification and passivation for high bandgap p–i–n perovskite solar cells. First demonstrations utilizing such technique of 1.78 eV bandgap perovskite and perovskite-OPV tandem solar cells produce record fill factors.
Abstract
Perovskite whentandemed with organic photovoltaics (OPV) for double-junctions have efficiencypotentials over 40%. However, there is still room for improvement suchas better current matching, higher fill factor, as well as lower voltage and fill factor losses in the top perovskite cell. Here weaddress the issue associated with the top perovskite cell by utilising anovel halogenated polycyclic aromatic hydrocarbon compound, 1-naphthylammoniumchloride (NA─Cl) playing dual roles of surface modification for the hole selectivelayer (HSL) and passivation of HSL/perovskiteinterface. Results of X-ray photoelectron spectroscopy and density functionaltheory calculations reveal that NA─Cl retains self-assembly property for the HSLwhile demonstrating high dipole moment and polarizability. This induces asurface dipole at the HSL/perovskite interface reducing the energetic barrierfor hole extraction by 210 meV thereby enhancing voltage output and fill factorof the device. Such scheme when implemented in a high bandgap (1.78 eV)perovskite solar cell, results in a respectable efficiency of 19.7% and thehighest fill factor of 85.4% amongst those of 1.78 eV perovskite cells reported.We have also achieved 23% cell efficient monolithic perovskite-OPV tandem withan impressive fill factor of 84%, which is the highest for perovskite-OPVtandem cells reported to-date.
07 Nov 05:51
by Naho Kurahashi,
Manuel Runkel,
Cedric Kreusel,
Maximilian Schiffer,
Timo Maschwitz,
Timo Kraus,
Kai Oliver Brinkmann,
Ralf Heiderhoff,
Maximilian Buchmüller,
Sven Oliver Schumacher,
Julius Brunner,
Detlef Rogalla,
Sercan Özen,
Felix Lang,
Yana Vaynzof,
Patrick Görrn,
Thomas Riedl
The first distributed feedback (DFB) laser based on a CsPbI3 thin film is fabricated by thermal nanoimprint. The additive polyvinyl pyrrolidone (PVP) ensures phase stability of the CsPbI3 even under the conditions of thermal imprint. The DFB lasers achieve a low lasing threshold of 45 µJ cm−2 and tunable emission in the deep red spectral region.
Abstract
All-inorganic cesium lead halide perovskites (CsPbX3, with X = I, Br, Cl) are of great interest for light-emitting diodes and lasers, as they promise improved thermal stability compared to their organic–inorganic analogues. However, among this family of materials, CsPbI3 shows a detrimental phase instability that causes the perovskite to convert to a thermodynamically preferred non-perovskite phase (yellow phase) at room temperature. In fact, reports on lasers using thin films of CsPbI3 as gain medium are missing, as of yet. Here, the first distributed feedback (DFB) lasers based on CsPbI3 thin films are presented with a resonator directly patterned into the perovskite by thermal nanoimprint. This breakthrough is unlocked by the additive polyvinyl pyrrolidone (PVP), that affords the formation of perovskite layers consisting of phase stable γ-CsPbI3 nanocrystals, that are even preserved during thermal imprint at 170 °C. The DFB lasers show a low lasing threshold of 45 µJ cm−2 at room temperature under optical pumping and a tunable emission in the deep red spectral region between 714.1 to 723.4 nm. It is anticipated that the findings of this work will have a broad relevance for future electrically driven perovskite lasers and for light-emitting diodes based on CsPbI3 as active medium.
07 Nov 05:50
by Fenghua Zhang,
Yinong Yin,
Mandi Li,
Yang Liu,
Jun Jiang,
Xiong Li
2D n-type SnS is introduced into the PM6:Y6 BHJ organic solar cells. SnS promotes Y6 crystallization and renders the face-on orientation of Y6 molecules dominant. The improved active layer morphology suppresses carrier recombination and boosts electron transport, leading to more balanced hole-electron mobility. With improved V
OC, J
SC and FF, an optimized PCE of 18.50% is achieved.
Abstract
The unbalanced electron-hole mobility is the major bottleneck for boosting the photovoltaic performance of organic solar cells. In this study, 2D n-type inorganic semiconductor material tin sulfide (SnS) is prepared and introduced into the PM6:Y6 bulk heterojunction organic solar cells to improve photovoltaic performance. The incorporation of SnS promotes Y6 crystallization, and renders the face-on orientation of Y6 molecules dominant. The improved active layer morphology suppresses carrier recombination and strengthens the electron transport. The electron mobility increases significantly from 4.71 × 10−4 cm2 V−1 s−1 to 7.61 × 10−4 cm2 V−1 s−1 with the hole/electron mobilities (µ
h/µ
e) value reducing from 1.67 to 1.11. With enhanced and balanced carrier mobility, the open-circuit voltage, short-circuit current density and fill factor of the SnS-doped PM6:Y6 organic solar cells are improved simultaneously, and the power conversion efficiency is boosted from 16.66 to 18.50%. Additionally, the SnS doped devices exhibit better thermal and storage stability. The improved photovoltaic performance is further verified in PM6:L8-BO and D18:Y6 based organic solar cells. This work demonstrates that n-type SnS dopant is an efficient and universal method to improve photovoltaic performance of non-fullerene organic solar cells.
07 Nov 05:50
by Xiaokang Sun,
Chenyang Zhang,
Yiguo Yao,
Jie Lv,
Jie Yao,
Xiaoman Ding,
Manjia Lu,
Liangxiang Zhu,
Guangye Zhang,
Haoran Lin,
Yumeng Shi,
Kai Wang,
Chunming Yang,
Xiaoping Ouyang,
Hanlin Hu,
Iain McCulloch,
Yuanbao Lin
A self-assembled monolayer (SAM) named 1Br-2PACz is developed, which weakens the interaction between the SAMs and acceptor molecules, eventually allowing for a better vertical phase distribution, crystallization, and aggregation in the active layer. The 1Br-2PACz SAM enables an impressive PCE of 19.35% for PM6:BTP-eC9 binary organic photovoltaics.
Abstract
A bromine-substituted [2-(9H-Carbazol-9-yl) ethyl] phosphonic acid, 1Br-2PACz, is designed as hole-selective self-assembled monolayers (SAMs), contributing to an outstanding power conversion efficiency (PCE) of 19.35% for binary bulk-heterojunction (BHJ) based organic solar cells (OSCs). As compared to the previous high-performance 2Br-2PACz SAMs, 1Br-2PACz molecules can effectively reduce the interaction of the SAM with the BTP-eC9 nonfullerene acceptors with a decreased binding energy, resulting in the suppressed vertical self-aggregation of BTP-eC9 small molecules as the bottom side of PM6:BTP-eC9 BHJ during the solidification process. There is decreased energetic disorder within photoactive layer together with more efficient charge transfer and suppressed non-radiative recombination. Furthermore, five additional binary BHJ systems are applied in 1Br-2PACz SAM-based OSCs, exhibiting continuously superior performance as compared to the reference cells with conventional PEDOT:PSS hole transport layer. This work underscores the potential of advancing OSCs by fine-tuning SAMs through halogenation strategies to improve active layer morphology and overall device performance.
07 Nov 05:47
by Jian Su,
Tao Hu,
Xin Chen,
Xianwei Zhang,
Ning Fang,
Jican Hao,
Huafei Guo,
Sai Jiang,
Ding Gu,
Jianhua Qiu,
Han Zhang,
Ziyao Zhou
A multi-functional perovskite interface passivation strategy based on guanidinium iodide is proposed. The guanidinium iodide, with its ammonium group, unsaturated nitrogen atoms, and iodide ions, synergistically repairs the perovskite interface defects through various pathways, passivates the grain boundaries, effectively suppresses non-radiative recombination, and significantly improves the photovoltaic performance of the device.
Abstract
Perovskite solar cells have become a leading contender in next-generation photovoltaic technologies due to their high efficiency and low-cost potential. Managing the deep defects present effectively in the crystal lattice and at the interfaces is essential for enhancing the performance and longevity of perovskite solar cells. Here, perovskite's crystallization modulation and interfacial defect passivation are achieved by developing a guanidinium iodide (GAI)-based surface passivation strategy. The integration of GAI passivates the grain boundaries, leading to a perovskite thin film with a smoother and more uniform grain distribution, facilitating charge carrier transport. Notably, the ammonium group, unsaturated nitrogen atoms, and iodide ions in GAI can collectively repair the surface defects of perovskite through various pathways, effectively suppressing non-radiative recombination, thereby enhancing the photovoltaic performance of the device. Ultimately, the champion device treated with GAI achieves a power conversion efficiency (PCE) of 23.02% and demonstrates similar ambient stability under unencapsulated conditions. These findings underscore the effectiveness of GAI passivation as a strategy to balance the improvement of the performance and stability of perovskite solar cells.
07 Nov 05:45
by Ka‐Wai Lee,
Yijian Gao,
Shu‐Hua Chou,
Yingpeng Wan,
Allen Chu‐Hsiang Hsu,
Ji‐Hua Tan,
Yuqing Li,
Zhiqiang Guan,
Huan Chen,
Shengliang Li,
Ken‐Tsung Wong,
Chun‐Sing Lee
NIR-II emissive through-space charge-transfer (TSCT) nanoparticles (NPs) of small-size TTP molecules are reported. Owing to the short conjugation of the TTP molecule with a small molecular weight of only 518 g mol-1, it shows visible absorption and NIR-I emission. After forming nanoaggregates, the efficient TSCT between monomers contributes to significantly red-shifted optical properties in NP which are applied in NIR-II bioimaging and cancer phototheranostics.
Abstract
Phototheranostics with second near-infrared (NIR-II) emissions show great potential for disease diagnosis and imaging-guided phototherapy owing to deep tissue penetration, high imaging resolution, and excellent tumor eradication. Recently, molecular conjugation engineering and J-aggregation have been used to construct organic NIR-II materials. However, these molecules generally have extensive conjugation and large molecular weight in the range of 700–1700 g mol−1, requiring complicated molecular design and synthesis. Herein, a NIR-II emissive through-space charge-transfer (TSCT) nanoparticle (NP) using short-conjugated donor-acceptor (D-A) molecules (TTP) is reported for high-performance bioimaging and cancer phototheranostics. Owing to the short conjugation of the TTP molecule with a small molecular weight of only 518 g mol−1, the TTP monomer possesses visible absorption and first near-infrared (NIR-I) emission. Upon forming NPs in water, the efficient TSCT between TTP monomers leads to significantly red-shifted absorption to the NIR-I and emission to the NIR-II region with a tail that extends to 1400 nm. TTP NPs are employed in NIR-II in vivo blood-vessel bioimaging and cancer phototheranostics successfully. This work introduces a facile strategy to construct NIR-II emissive NPs based on short-conjugated D-A molecules for high-performance biomedical applications.
07 Nov 05:45
by Xueqi Cai,
Yitong Sun,
Wenjie He,
Yifan Zheng,
Yonggang Shi,
Qiue Cao
A pair of amino-borane isomers are synthesized in order to investigate the impact of the charge transfer channel on phosphorescence emission. Interestingly, they exhibit multi-substrate multicolor luminescence, phosphorescent energy transfer, multi-level data encryption, and textile information encryption behaviors, which opens a new way for the design and application of organic room-temperature phosphorescent materials.
Abstract
Significant advances are made in understanding the structure-property relationship in room-temperature phosphorescence (RTP) materials. For example, intramolecular charge transfer (ICT) structural molecules based on electron donors(D) and electron acceptors(A) are an efficient method to achieve RTP. However, the ability to precisely regulate the singlet-triplet energy gap (ΔE
ST) through molecular design to control RTP emissions remains constrained. Herein, a group of 4BN-NP and 5BN-NP isomers is reported with D and A position isomerization, where 4BN-NP exhibits a photo-induced orange afterglow phenomenon in PMMA. Calculations show that the spin-orbit coupling (SOC) value of 4BN-NP is greater compared to 5BN-NP and the intersystem crossing (ISC) channel is more efficient, resulting in a smaller ΔE
ST value for 4BN-NP. This indicates that the short ICT channel is more conducive to inducing phosphorescence emission. In addition, compound 4BN-NP co-doped with red fluorescent dyes (RhB, Rh6G, and RBNN) in PMMA produces phosphorescence resonance energy transfer (PRET), inducing red afterglow emission. Surprisingly, light-activated yellow RTP can be obtained by attaching 4BN-NP with polymethyl methacrylate (PMMA) to nylon filaments, and its phosphorescence intensity does not diminish even when it is immersed in water containing detergent solution, thus expanding the prospects of its application in textile encryption.
07 Nov 05:45
by Yusheng Li,
Junke Jiang,
Dandan Wang,
Dong Liu,
Shota Yajima,
Hua Li,
Akihito Fuchimoto,
Hongshi Li,
Guozheng Shi,
Shuzi Hayase,
Shuxia Tao,
Jiangjian Shi,
Qingbo Meng,
Chao Ding,
Qing Shen
Capturing hot carriers is crucial for advancing optoelectronic technologies. This work reveals that in CsPbI₃ perovskite nanocrystal-fullerene hybrids, electronic coupling acts as a bridge, modulating hot carrier capture dynamics and converting a previously forbidden process into an efficient, allowed one. This highlights the importance of tuning interfacial interactions and coupling to enhance hot carrier applications.
Abstract
The efficient harnessing of hot carriers holds transformative potential for next-generation optoelectronic devices. Halide perovskites, with their remarkably long carrier lifetimes exceeding 10 picoseconds, stand at the forefront of this research frontier. Yet, a fundamental paradox persists: why does efficient hot carrier capture remain elusive despite these extended lifetimes? Here, this conundrum is unraveled by constructing a donor–acceptor model system: perovskite nanocrystal and fullerene hybrids. It is demonstrated that the challenge lies not only in the carrier lifetime itself but in the nature of the coupling between donor and acceptor components. Remarkably, it is discovered that the formation of ground-state complexes, with effective coupling across a wide energy range, not only overcomes the initially forbidden hot carrier capture within these hybrids but also dramatically enhances it, achieving a ≈76% hot carrier capture efficiency. This finding shifts the paradigm of hot carrier capture from extending carrier lifetimes to engineering donor–acceptor coupling, illuminating a path toward practical hot carrier applications.
07 Nov 03:56
Chem. Commun., 2024, 60,13819-13831
DOI: 10.1039/D4CC04884A, Highlight
Bin Du, Jintao Ma, Hongkun Xiang, Yanlong Wang, Bixin Li
Recent advances in the development of multiple classes of materials applied to buried interface engineering for highly efficient and stable perovskite solar cells, including the development of organic, inorganic, and polymeric materials.
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07 Nov 03:53
Chem. Commun., 2024, 60,14196-14199
DOI: 10.1039/D4CC04938A, Communication
Junqing Wang, Xiaoyi Lai, Yongzhi Zhou, Lei Hua, Weiguo Zhu, Pengfei Duan, Yafei Wang
Two orange-red emission circularly polarized thermally activated delayed fluorescence emitters (R)-ad-PXZ/(S)-ad-PXZ were synthesized. The solution processable device exhibits the maximum external quantum efficiency of 9.0% and gEL value of 10−3.
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07 Nov 03:41
J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC04214J, Paper
Xingxing Duan, Bufan Yu, Guangrong Jin, Dengliang Zhang, Jiangshan Chen, Dongge Ma
Aminophylline modification enables mixed-halide blue quasi-2D perovskite LEDs to achieve low efficiency roll-off and excellent spectral stability.
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07 Nov 03:41
J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC03641G, Paper
Jianing Wang, Yuanhong Gao, Minming Yan, Xiwei Zheng, Meili Xu, Hong Chen, Lingqiang Meng, Wei Huang, Hong Meng
We design a novel hybrid-layered organic phototransistor (HLPT) as a solar-blind ultraviolet (SBUV) photodetector based on wide-band series materials.
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07 Nov 03:38
J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC03780D, Paper
Dan Chen, Yu Mao, Xianglan Huang, Jichen Zhao, Zhiyuan Zhang, Jian Wang, Junbiao Peng
Our findings show that the spectral stability of the quasi-2D perovskite system is mainly affected by the uniformity of the Br–Cl distribution, rather than defects.
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07 Nov 03:38
J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC03735A, Paper
Xiaocheng Wu, Junjie Liu, Yunhao Xu, Longzhen Qiu, Xiaohong Wang
High-performance circularly polarized photodetectors with photocurrent asymmetry factor (|gph|) as high as 0.58 were prepared by a blending-induced chiral transfer method.
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07 Nov 03:38
J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC03915G, Paper
Yawei Miao, Tingting Xue, Xue Zhou, Shaoyun Jia, Chuantao Gu
Benefiting from optimized molecular co-facial conformation and π–π stacking by using an asymmetric strategy, the B-TPA based PSCs yielded a PCE of 23.2%.
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07 Nov 03:36
J. Mater. Chem. A, 2024, Advance Article
DOI: 10.1039/D4TA05776G, Paper
Ting Su, Wenjun Liu, Hao Xu, Huilong Chen, Kin Long Wong, Wanru Zhang, Qingting Su, Tongxin Wang, Shanlei Xu, Xingting Liu, Weiwei Lv, Renyong Geng, Jun Yin, Xin Song
The efficiency and stability of nickel oxide (NiOx)-based perovskite solar cells (PSCs) are critically hindered by defects and suboptimal charge transfer at the interface between perovskite crystals and the NiOx layer.
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以昇陳, Ben and one other like this
07 Nov 03:35
J. Mater. Chem. A, 2024, 12,31740-31768
DOI: 10.1039/D4TA04233F, Review Article
Dae Hwan Lee, Chanhyeok Kim, Giwon Shin, Geoneop Choi, Sang Shin Park, Taiho Park, Sung Yun Son
Quantum dot solar cells (QDSCs) have excellent optoelectronic properties but face challenges in performance and stability. This review highlights advances in organic conjugated materials to improve QDSC performance and outlines key design principles.
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07 Nov 03:28
Energy Environ. Sci., 2024, 17,9580-9589
DOI: 10.1039/D4EE03045A, Paper
Mingqian Chen, Yanxun Li, Zixin Zeng, Ming Liu, Tao Du, Xiaofeng Huang, Leyu Bi, Jiarong Wang, Wenlin Jiang, Yidan An, Sai-Wing Tsang, Jun Yin, Shengfan Wu, Alex K.-Y. Jen
Inhomogeneous halide distribution and high defect levels result from unbalanced crystallization in mixed halide perovskites. IA cations regulate crystallization and minimize defects, creating high-performance perovskite solar cells and tandems.
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04 Nov 03:01
by Xujie Wang,
Xinhui Gao,
Hai Zhong,
Kai Yang,
Biao Zhao,
Jianping Deng
Three-level chirality transfer and amplification from point chirality of small molecules to helical chirality of helical polymers and finally to supramolecular chirality of cholesteric liquid crystals consisting of chiral nonfluorescent polymers and nematic liquid crystals is constructed. Full-color and white CPL are realized via further introducing achiral fluorophores. Anti-counterfeiting security, information encryption, and chiral logic gate applications are developed.
Abstract
Chiral liquid crystal supramolecular assembly provides an ideal strategy for constructing excellent circularly polarized luminescence (CPL) materials. However, the chirality transfer in chiral liquid crystals normally occurs at two levels from the configurational chirality to the supramolecular phase chirality. The more precise and more levels of chirality transmission are fascinating but remain challenging. The present work reports the first success of three-level chirality transfer and amplification from configurationally point chirality of small molecules to conformationally helical chirality of helical polymers and finally to supramolecular phase chirality of cholesteric liquid crystals composed of chiral nonfluorescent polymers (P46) and nematic liquid crystals. Noticeably, the helical twisting power of P46 is five-fold larger than its monomer. Full-color and white CPL with maximum luminescence dissymmetry factor up to 1.54 and photoluminescence quantum yield up to 63.8% are realized utilizing helical supramolecular assembly combined with selective reflection mechanism. Also significantly, the electrically stimuli-responsive CPL switching device as well as anti-counterfeiting security, information encryption, and chiral logic gate applications are developed. This study deepens the understanding of chirality transfer and amplification across different hierarchical levels.
04 Nov 02:51
J. Mater. Chem. C, 2024, 12,18952-18971
DOI: 10.1039/D4TC04111A, Review Article
Xiaoxiao Yang, Xin Luo, Yuxiao Guo, Dan Zhao, Esmaeil Sheibani, Bo Xu
Recent progress in cross-linkable organic hole-transporting materials (HTMs) in perovskite-based solar cells (PSCs) and light-emitting diodes (PeLEDs) has been systematically summarized and discussed.
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04 Nov 02:51
J. Mater. Chem. C, 2024, 12,5596-5607
DOI: 10.1039/D4TC00271G, Paper
D. S. Shtarev, D. A. Chaplygina, O. V. Patrusheva, C. Chen, A. V. Shtareva, C. C. Stoumpos, R. Kevorkyants, A. V. Emeline
This work presents the synthesis and optoelectronic properties of the crystalline phases [Pb2Br5][C6NH8] and [PbBr3][C6NH8] of 2-methylpyridinium lead bromide.
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04 Nov 02:50
J. Mater. Chem. C, 2024, 12,5469-5479
DOI: 10.1039/D3TC03768A, Paper
Seon Bin Song, Myungsun Sim, Min Seok Ki, Taewoo Kim, You Kyoung Chung, Joonsuk Huh, Ohyun Kwon, Keewook Paeng
Simultaneous improvement in the thermal stability and electrical properties of an electron transport material by mixing components that form intermolecular lithium bonding between different mixing components.
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