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25 Sep 03:58

[ASAP] Performance, Morphology, and Charge Recombination Correlations in Ternary Squaraine Solar Cells

by Yao Chen, Lin Yang, Jianglin Wu, Gang Wang, Wei Huang, Ferdinand S. Melkonyan, Zhiyun Lu, Yan Huang, Tobin J. Marks, Antonio Facchetti

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Chemistry of Materials
DOI: 10.1021/acs.chemmater.8b02746
19 Sep 03:55

Low Temperature Fabrication for High Performance Flexible CsPbI2Br Perovskite Solar Cells

by Hong Jiang , Jiangshan Feng , Huan Zhao , Guijun Li , Guannan Yin , Yu Han , Feng Yan , Zhike Liu , Shengzhong (Frank) Liu
Advanced Science, EarlyView.
18 Sep 01:58

Impact of 2‐Ethylhexyl Stereoisomers on the Electrical Performance of Single‐Crystal Field‐Effect Transistors

by Tao He , Pawaret Leowanawat , Christian Burschka , Vladimir Stepanenko , Matthias Stolte , Frank Würthner
Advanced Materials, EarlyView.
14 Sep 05:55

Spray-assisted deposition of CsPbBr3 films in ambient air for large-area inorganic perovskite solar cells

Publication date: December 2018

Source: Materials Today Energy, Volume 10

Author(s): Jialong Duan, Dawei Dou, Yuanyuan Zhao, Yudi Wang, Xiya Yang, Haiwen Yuan, Benlin He, Qunwei Tang

Abstract

High-purity cesium lead bromide (CsPbBr3) perovskite films are expected to promote the commercial manufacture of inorganic perovskite solar cells (PSCs). We present here a spray-assisted deposition of high-quality CsPbBr3 films in ambient air by spin-coating a PbBr2 layer and sequentially spraying CsBr multilayer to simplify the film fabrication technology. Upon optimizing spray deposition at four cycles, a high-purity CsPbBr3 phase is prepared and a maximized power conversion efficiency of 5.68% is achieved for the carbon-based inorganic PSC device. Furthermore, molybdenum disulfide quantum dots with an intermediate energy level are set at CsPbBr3/carbon interface to markedly increase charge extraction and to suppress electron-hole recombination, arising from the perovskite grain boundary passivation. Finally, the optimal inorganic PSC yields a stabilized efficiency of 6.80% under one sun illumination. Using this spray-assisted deposition method, this CsPbBr3 solar cell with an active area of 1 cm2 achieves an efficiency of 4.12%. The photovoltaic performances are relatively stable even upon 80% relative humidity over 700 h without encapsulation.

Graphical abstract

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14 Sep 05:54

Efficiency Exceeding 20% in Perovskite Solar Cells with Side‐Chain Liquid Crystalline Polymer–Doped Perovskite Absorbers

by Veera Murugan Arivunithi , Saripally Sudhaker Reddy , Vijaya Gopalan Sree , Ho‐Yeol Park , Juuyn Park , Yong‐Cheol Kang , Eun‐Sol Shin , Yong‐Young Noh , Myungkwan Song , Sung‐Ho Jin
Advanced Energy Materials, EarlyView.
14 Sep 05:54

Balance Between Light Absorption and Recombination Losses in Solution‐Processed Small Molecule Solar Cells with Normal or Inverted Structures

by Viktor V. Brus , Hang Ken Lee , Christopher M. Proctor , Michael Ford , Xiaofeng Liu , Mark A. Burgers , Jaechol Lee , Guillermo C. Bazan , Thuc‐Quyen Nguyen
Advanced Energy Materials, EarlyView.
14 Sep 05:54

Low‐Temperature Processable High‐Performance D–A‐Type Random Copolymers for Nonfullerene Polymer Solar Cells and Application to Flexible Devices

by Ji‐yeong Kim , Sungmin Park , Seungjin Lee , Hyungju Ahn , Sung‐yoon Joe , Bumjoon J. Kim , Hae Jung Son
Advanced Energy Materials, EarlyView.
14 Sep 05:51

Marching Toward Highly Efficient, Pure‐Blue, and Stable Thermally Activated Delayed Fluorescent Organic Light‐Emitting Diodes

by Xinyi Cai , Shi‐Jian Su
Advanced Functional Materials, EarlyView.
14 Sep 05:51

[ASAP] Effect of the Number and Substitution Pattern of Carbazole Donors on the Singlet and Triplet State Energies in a Series of Carbazole-Oxadiazole Derivatives Exhibiting Thermally Activated Delayed Fluorescence

by Matthew W. Cooper, Xiaoqing Zhang, Yadong Zhang, Soon Ok Jeon, Hasup Lee, Sunghan Kim, Canek Fuentes-Hernandez, Stephen Barlow, Bernard Kippelen, Seth R. Marder

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Chemistry of Materials
DOI: 10.1021/acs.chemmater.8b02632
14 Sep 05:50

[ASAP] Thermodynamically Stable Orthorhombic ?-CsPbI3 Thin Films for High-Performance Photovoltaics

by Boya Zhao, Shi-Feng Jin, Sheng Huang, Ning Liu, Jing-Yuan Ma, Ding-Jiang Xue, Qiwei Han, Jie Ding, Qian-Qing Ge, Yaqing Feng, Jin-Song Hu

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Journal of the American Chemical Society
DOI: 10.1021/jacs.8b06050
10 Sep 17:24

4,5‐Diazafluorene‐Based Donor–Acceptor Small Molecules as Charge Trapping Elements for Tunable Nonvolatile Organic Transistor Memory

by Yang Yu , Lin‐Yi Bian , Jian‐Guo Chen , Qi‐Hao Ma , Yin‐Xiang Li , Hai‐Feng Ling , Quan‐You Feng , Ling‐Hai Xie , Ming‐Dong Yi , Wei Huang
Advanced Science, EarlyView.
10 Sep 17:22

In Vivo Early Tumor Detection and Diagnosis by Infrared Luminescence Transient Nanothermometry

by Harrisson D. A. Santos , Erving C. Ximendes , Maria del Carmen Iglesias‐de la Cruz , Irene Chaves‐Coira , Blanca del Rosal , Carlos Jacinto , Luis Monge , Irene Rubia‐Rodríguez , Daniel Ortega , Sergio Mateos , José GarcíaSolé , Daniel Jaque , Nuria Fernández
Advanced Functional Materials, EarlyView.
07 Sep 00:36

[ASAP] Benzotrithiophene-Based Covalent Organic Frameworks: Construction and Structure Transformation under Ionothermal Condition

by Hongtao Wei, Jing Ning, Xingdi Cao, Xuehui Li, Long Hao

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Journal of the American Chemical Society
DOI: 10.1021/jacs.8b08282
05 Sep 09:57

[ASAP] High Efficiency and Long Lifetime of a Fluorescent Blue-Light Emitter Made of a Pyrene Core and Optimized Side Groups

by Hyocheol Jung, Seokwoo Kang, Hayoon Lee, Young-Jun Yu, Jae Ho Jeong, Jie Song, Youngmin Jeon, Jongwook Park

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.8b09013
05 Sep 09:40

[ASAP] Breaking the Efficiency Limit of Fluorescent OLEDs by Hybridized Local and Charge-Transfer Host Materials

by Lingfeng Chen, Shitong Zhang, Hui Li, Runfeng Chen, Lu Jin, Kai Yuan, Huanhuan Li, Ping Lu, Bing Yang, Wei Huang

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The Journal of Physical Chemistry Letters
DOI: 10.1021/acs.jpclett.8b02138
05 Sep 09:39

Efficient non-fullerene organic solar cells employing sequentially deposited donor–acceptor layers

J. Mater. Chem. A, 2018, 6,18225-18233
DOI: 10.1039/C8TA06860G, Paper
Jiangbin Zhang, Bin Kan, Andrew J. Pearson, Andrew J. Parnell, Joshaniel F. K. Cooper, Xiao-Ke Liu, Patrick J. Conaghan, Thomas R. Hopper, Yutian Wu, Xiangjian Wan, Feng Gao, Neil C. Greenham, Artem A. Bakulin, Yongsheng Chen, Richard H. Friend
A new fabrication method via sequentially depositing donor and acceptor layers can push the power conversion efficiency of organic solar cells based on non-fullerene acceptors to over 10%.
The content of this RSS Feed (c) The Royal Society of Chemistry
05 Sep 09:33

Boron dipyrromethene (BODIPY) with meso-perfluorinated alkyl substituents as near infrared donors in organic solar cells

J. Mater. Chem. A, 2018, Advance Article
DOI: 10.1039/C8TA06261G, Paper
Tian-yi Li, Johannes Benduhn, Yue Li, Frank Jaiser, Donato Spoltore, Olaf Zeika, Zaifei Ma, Dieter Neher, Koen Vandewal, Karl Leo
Three furan-fused BODIPYs were synthesized with perfluorinated alkyl substitutes on the meso-C. As NIR absorbers, a PCE of 6.4% was achieved in a single junction organic solar cell with relatively low energy losses.
To cite this article before page numbers are assigned, use the DOI form of citation above.
The content of this RSS Feed (c) The Royal Society of Chemistry
05 Sep 09:29

Enhancing the n‐Type Conductivity and Thermoelectric Performance of Donor–Acceptor Copolymers through Donor Engineering

by Chi‐Yuan Yang , Wen‐Long Jin , Jue Wang , Yi‐Fan Ding , Shuying Nong , Ke Shi , Yang Lu , Ya‐Zhong Dai , Fang‐Dong Zhuang , Ting Lei , Chong‐An Di , Daoben Zhu , Jie‐Yu Wang , Jian Pei
Advanced Materials, EarlyView.
05 Sep 09:29

Facile integration of low-cost black phosphorus in solution-processed organic solar cells with improved fill factor and device efficiency

Publication date: November 2018

Source: Nano Energy, Volume 53

Author(s): Yun Zhao, Teresa L. Chen, Liangang Xiao, Matthew A. Kolaczkowski, Liang Zhang, Liana M. Klivansky, Virginia Altoe, Bining Tian, Jinghua Guo, Xiaobin Peng, Yue Tian, Yi Liu

Abstract

Black phosphorus (BP) as a promising two-dimensional (2D) material has gained great attention in nanoelectronic devices because of its intrinsic semiconductor characteristics. However, the poor material availability and solution processability have been major roadblocks that hinder its wider application in microelectronics. Herein, readily available, lost-cost BP was utilized as an effective component that was integrated via a facile solution process for the fabrication of bulk heterojunction organic solar cells (OSCs). An impressive fill factor (FF) of 74.2% and power conversion efficiency (PCE) of 10.5% were realized in the OSCs incorporating 10 wt% of BP in the active layer of the benchmark polymer donor PTB7-Th and PC71BM acceptor, corresponding to a 20% PCE enhancement compared to the BP-free binary devices. The efficiency enhancement can be attributed to BP's high hole carrier mobility that facilitates better carrier extraction and suppression of the recombination. BP has been further demonstrated to be effective in additional solar cells based on other photovoltaic (PV) materials, including non-fullerene OSCs. The successful incorporation of the inexpensive BP in the solution-based fabrication of OSCs opens the door for its application in high performance, low cost flexible electronics.

Graphical abstract

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05 Sep 09:28

A facile route to grain morphology controllable perovskite thin films towards highly efficient perovskite solar cells

Publication date: November 2018

Source: Nano Energy, Volume 53

Author(s): Fuguo Zhang, Jiayan Cong, Yuanyuan Li, Jan Bergstrand, Haichun Liu, Bin Cai, Alireza Hajian, Zhaoyang Yao, Linqin Wang, Yan Hao, Xichuan Yang, James M. Gardner, Hans Ågren, Jerker Widengren, Lars Kloo, Licheng Sun

Abstract

Perovskite photovoltaics have recently attracted extensive attention due to their unprecedented high power conversion efficiencies (PCEs) in combination with primitive manufacturing conditions. However, the inherent polycrystalline nature of perovskite films renders an exceptional density of structural defects, especially at the grain boundaries (GBs) and film surfaces, representing a key challenge that impedes the further performance improvement of perovskite solar cells (PSCs) and large solar module ambitions towards commercialization. Here, a novel strategy is presented utilizing a simple ethylammonium chloride (EACl) additive in combination with a facile solvent bathing approach to achieve high quality methyammonium lead iodide (MAPbI3) films. Well-oriented, micron-sized grains were observed, which contribute to an extended carrier lifetime and reduced trap density. Further investigations unraveled the distinctively prominent effects of EACl in modulating the perovskite film quality. The EACl was found to promote the perovskite grain growing without undergoing the formation of intermediate phases. Moreover, the EACl was also revealed to deplete at relative low temperature to enhance the film quality without compromising the beneficial bandgap for solar cell applications. This new strategy boosts the power conversion efficiency (PCE) to 20.9% and 19.0% for devices with effective areas of 0.126 cm2 and 1.020 cm2, respectively, with negligible current hysteresis and enhanced stability. Besides, perovskite films with a size of 10 × 10 cm2, and an assembled 16 cm2 (5 × 5 cm2 module) perovskite solar module with a PCE of over 11% were constructed.

Graphical abstract

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05 Sep 03:05

The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide

Energy Environ. Sci., 2018, Advance Article
DOI: 10.1039/C8EE01697F, Paper
Denis Barboni, Roger A. De Souza
A quantitative description of the ionic conductivity of MAPbI3 is built on two pillars: knowledge of the iodine-vacancy jump rate and of the density of iodine defects.
To cite this article before page numbers are assigned, use the DOI form of citation above.
The content of this RSS Feed (c) The Royal Society of Chemistry
05 Sep 02:22

[ASAP] All-Polymer Solar Cells with 9.4% Efficiency from Naphthalene Diimide-Biselenophene Copolymer Acceptor

by Nagesh B. Kolhe, Hyunjong Lee, Daiki Kuzuhara, Noriyuki Yoshimoto, Tomoyuki Koganezawa, Samson A. Jenekhe

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Chemistry of Materials
DOI: 10.1021/acs.chemmater.8b03229
05 Sep 02:20

Advance solar technology by marrying quality assurance with design engineering

by Sarah Kurtz

Advance solar technology by marrying quality assurance with design engineering

Advance solar technology by marrying quality assurance with design engineering, Published online: 03 September 2018; doi:10.1038/s41560-018-0241-x

The photovoltaics industry has grown remarkably in recent decades but as it has grown, quality assurance during the manufacturing and installation processes has become increasingly important. There is often a cultural divide between those who develop and those who implement the designs, motivating partnering of these efforts.
30 Aug 08:57

[ASAP] High-Efficiency White Organic Light-Emitting Diodes Integrating Gradient Exciplex Allocation System and Novel D-Spiro-A Materials

by Xun Tang, Xiang-Yang Liu, Yi Yuan, Yong-Jie Wang, Hong-Cheng Li, Zuo-Quan Jiang, Liang-Sheng Liao

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.8b09418
29 Aug 14:26

Regulating the electron transporting properties of indacenodithiophene derivatives for perovskite solar cells with PCEs up to 19.51%

J. Mater. Chem. A, 2018, 6,18044-18049
DOI: 10.1039/C8TA06730A, Paper
Linna Zhu, Wei Gao, Fei Wu, Lu Li, Chuluo Yang
ITCPTC as an ETL provides PSCs with an efficiency of 17.42% and as an interlayer offers a remarkable efficiency of 19.51%.
The content of this RSS Feed (c) The Royal Society of Chemistry
29 Aug 00:24

Naphthobistriazole-based wide bandgap donor polymers for efficient non-fullerene organic solar cells: Significant fine-tuning absorption and energy level by backbone fluorination

Publication date: November 2018

Source: Nano Energy, Volume 53

Author(s): Dongsheng Tang, Jiahui Wan, Xiaopeng Xu, Young Woong Lee, Han Young Woo, Kui Feng, Qiang Peng

Abstract

In this work, two wide bandgap polymers of PDTT-TZNT and PDTF-TZNT were developed by Stille-coupling of naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) acceptor unit with bithiophene (DTH) and fluorinated bithiophene (DTF), respectively. These polymers exhibited a wide bandgap over 1.84 eV. The fluorinated PDTF-TZNT had lower highest occupied molecular orbital HOMO level (− 5.24 eV), higher molar absorption coefficient (1.28 × 105 M−1 cm−1), and higher molecular packing order. Using a low bandgap 3,9-bis(2-methylene-(5&6-methyl-(3-(1,1-dicyanomethylene)-indanone)))−5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]-dithiophene (IT-M) as the electron acceptor, the PDTF-TZNT:IT-M devices generated a higher power conversion efficiency (PCE) of 10.05%. To make up the weak absorption of above binary blend of PDTF-TZNT:IT-M in the short wavelength region and increase the device performance further, a large bandgap small molecular acceptor of 5,5,10,10,15,15-hexabutyl-2,7,12-tri(4-(3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile-benzothiadiazole)-truxene (meta-TrBRCN) was added as the second acceptor material to fabricate ternary blend PSCs. The meta-TrBRCN could not only expand the absorption range but also fine-tune the blend morphology by stepwise changing its content. When 0.2 of meta-TrBRCN was added, the PCE of PDTF-TZNT:IT-M devices was improved to 11.48%.

Graphical abstract

Two novel naphthobistriazole-based wide bandgap polymers, PDTH-TZNT and PDTF-TZNT, has been developed for non-fullerene polymer solar cells. The fluorinated PDTF-TZNT exhibited a higher PCE of 10.05% in binary PDTT-FTAZ:IT-M devices. By adding 0.2 of meta-TrBRCN as the second acceptor, the related ternary blend devices exhibited a significantly improved PCE of 11.48%.

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25 Aug 11:17

Quinoid‐Resonant Conducting Polymers Achieve High Electrical Conductivity over 4000 S cm−1 for Thermoelectrics

by Dafei Yuan , Liyao Liu , Xuechen Jiao , Ye Zou , Christopher R. McNeill , Wei Xu , Xiaozhang Zhu , Daoben Zhu
Advanced Science, EarlyView.
25 Aug 09:34

Highly Efficient Photosensitizers with Far‐Red/Near‐Infrared Aggregation‐Induced Emission for In Vitro and In Vivo Cancer Theranostics

by Dong Wang , Michelle M. S. Lee , Guogang Shan , Ryan T. K. Kwok , Jacky W. Y. Lam , Huifang Su , Yuchen Cai , Ben Zhong Tang
Advanced Materials, Volume 30, Issue 39, September 26, 2018.
25 Aug 06:10

[ASAP] Excited-State Planarization in Donor–Bridge Dye Sensitizers: Phenylene versus Thiophene Bridges

by Zachary Piontkowski, David W. McCamant

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Journal of the American Chemical Society
DOI: 10.1021/jacs.8b05463
23 Aug 10:10

Intensive Exposure of Functional Rings of a Polymeric Hole‐Transporting Material Enables Efficient Perovskite Solar Cells

by Luozheng Zhang , Chang Liu , Jie Zhang , Xiangnan Li , Chun Cheng , Yanqing Tian , Alex K.‐Y. Jen , Baomin Xu
Advanced Materials, Volume 30, Issue 39, September 26, 2018.