Shared posts

20 Nov 11:27

Recent Advances in Stretchable Supercapacitors Enabled by Low‐Dimensional Nanomaterials

by Changyong Cao, Yihang Chu, Yihao Zhou, Chi Zhang, Shaoxing Qu
Small Recent Advances in Stretchable Supercapacitors Enabled by Low‐Dimensional Nanomaterials

Recent advances in the development of stretchable supercapacitors from low‐dimensional nanomaterials are reviewed, with an emphasis on the aspects of electrode materials, design strategies, and fabrication and performance of devices. The challenges and prospective of the stretchable supercapacitors are also discussed, providing fundamental insight and offering useful guidelines for future design of new high‐performance stretchable energy devices for wearable and medical applications.


Abstract

Supercapacitors (SCs) have shown great potential for mobile energy storage technology owing to their long‐term durability, electrochemical stability, structural simplicity, as well as exceptional power density without much compromise in the energy density and cycle life parameters. As a result, stretchable SC devices have been incorporated in a variety of emerging electronics applications ranging from wearable electronic textiles to microrobots to integrated energy systems. In this review, the recent progress and achievements in the field of stretchable SCs enabled by low‐dimensional nanomaterials such as polypyrrole, carbon nanotubes, and graphene are presented. First, the three major categories of stretchable supercapacitors are discussed: double‐layer supercapacitors, pseudo‐supercapacitors, and hybrid supercapacitors. Then, the representative progress in developing stretchable electrodes with low‐dimensional (0D, 1D, and 2D) nanomaterials is described. Next, the design strategies enabling the stretchability of the devices, including the wavy‐shape design, wire‐shape design, textile‐shape design, kirigami‐shape design, origami‐shape design, and serpentine bridge‐island design are emphasized, with the aim of improving the electrochemical performance under the complex stretchability conditions that may be encountered in practical applications. Finally, the newest developments, major challenges, and outlook in the field of stretchable SC development and manufacturing are discussed.

13 Sep 01:29

A Cryogenic Process for Antisolvent‐Free High‐Performance Perovskite Solar Cells

by Annie Ng , Zhiwei Ren , Hanlin Hu , Patrick W. K. Fong , Qian Shen , Sin Hang Cheung , Pingli Qin , Jin‐Wook Lee , Aleksandra B. Djurišić , Shu Kong So , Gang Li , Yang Yang , Charles Surya
Advanced Materials A Cryogenic Process for Antisolvent‐Free High‐Performance Perovskite Solar Cells

A novel cryogenic process has universal applicability to prepare mixed perovskite films. Excellent film quality and consequently promising device performance result from decoupling of nucleation and crystallization phases during the formation of perovskites. The cryogenic temperature suppresses premature reactions of the precursors and prevents premature coalescence of nuclei into large crystallites, enabling uniform film formation following the blow‐drying and annealing processes.


Abstract

A cryogenic process is introduced to control the crystallization of perovskite layers, eliminating the need for the use of environmentally harmful antisolvents. This process enables decoupling of the nucleation and the crystallization phases by inhibiting chemical reactions in as‐cast precursor films rapidly cooled down by immersion in liquid nitrogen. The cooling is followed by blow‐drying with nitrogen gas, which induces uniform precipitation of precursors due to the supersaturation of precursors in the residual solvents at very low temperature, while at the same time enhancing the evaporation of the residual solvents and preventing the ordered precursors/perovskite from redissolving into the residual solvents. Using the proposed techniques, the crystallization process can be initiated after the formation of a uniform precursor seed layer. The process is generally applicable to improve the performance of solar cells using perovskite films with different compositions, as demonstrated on three different types of mixed halide perovskites. A champion power conversion efficiency (PCE) of 21.4% with open‐circuit voltage (V OC) = 1.14 V, short‐circuit current density ( J SC) = 23.5 mA cm−2, and fill factor (FF) = 0.80 is achieved using the proposed cryogenic process.

13 Sep 01:27

Engineering Stress in Perovskite Solar Cells to Improve Stability

by Nicholas Rolston , Kevin A. Bush , Adam D. Printz , Aryeh Gold‐Parker , Yichuan Ding , Michael F. Toney , Michael D. McGehee , Reinhold H. Dauskardt
Advanced Energy Materials, Volume 8, Issue 29, October 15, 2018.
17 Aug 11:25

Understanding how excess lead iodide precursor improves halide perovskite solar cell performance

by Byung-wook Park

Understanding how excess lead iodide precursor improves halide perovskite solar cell performance

Understanding how excess lead iodide precursor improves halide perovskite solar cell performance, Published online: 17 August 2018; doi:10.1038/s41467-018-05583-w

Excess lead iodide in the mixed halide perovskites solar cells leads to high device performance but its origin remains elusive. Here Park et al. unveil the underlying microscopic mechanism to be promoting the oriented growth of the perovskites crystals and reducing the defect concentration.
16 Aug 14:26

Temperature-assisted crystallization for inorganic CsPbI2Br perovskite solar cells to attain high stabilized efficiency 14.81%

Publication date: October 2018

Source: Nano Energy, Volume 52

Author(s): Dongliang Bai, Hui Bian, Zhiwen Jin, Haoran Wang, Lina Meng, Qian Wang, Shengzhong (Frank) Liu

Abstract

Due to its super thermal stability, inorganic CsPbI2Br perovskite has attracted more and more attention in the field of photovoltaic application. However, its device performance, as reported to date, is greatly challenged in preparing CsPbI2Br films with both sufficient absorbance and high quality. Herein, crystallization engineering is applied in producing solution-processed CsPbI2Br film to guarantee sufficient light harvesting and effective carrier extraction. Further study proves that the precursor solution temperature would largely affect the crystallization progress: (1) the nucleation step is highly related to the solubility of precursor in a specific solvent or solvents at elevated temperatures; (2) the crystal growth rate is highly related to the solvent evaporation rate. To obtain thick film with larger crystalline grain size, the precursor solution temperature should be carefully adjusted for both suppressing the formation of too many nuclei and increasing the crystallization rate at the same time. Finally, the optimized CsPbI2Br would be obtained when the precursor solution is maintained at 100 °C, the corresponding device shows a stabilized efficiency as high as 14.81%. As far as we know, this is the highest PCE for the CsPbBrI2 perovskite based solar cells.

Graphical abstract

Herein, the correlation between crystallization and external factors (solubility and solvent evaporation rate) is conducted for solution-processed CsPbI2Br film. With moderate precursor solution temperature, homogenous, pinhole-free, large crystalline grain size and thick CsPbI2Br film was obtained, which effectively increased the light absorption, and decreased recombination loss. As a result, the optimized champion device achieved long-term stabilized PCE of 14.81%.

fx1

16 Aug 13:55

Functionalization of Graphene Oxide Films with Au and MoOx Nanoparticles as Efficient p‐Contact Electrodes for Inverted Planar Perovskite Solar Cells

by Sumit S. Bhosale , Efat Jokar , Amir Fathi , Cheng‐Min Tsai , Chi‐Yung Wang , Eric Wei‐Guang Diau
Advanced Materials, July 2018.
16 Aug 13:33

[ASAP] Control of Crystal Structures and Optical Properties with Hybrid Formamidinium and 2-Hydroxyethylammonium Cations for Mesoscopic Carbon-Electrode Tin-Based Perovskite Solar Cells

by Cheng-Min Tsai, Yu-Pei Lin, Murali Krishna Pola, Sudhakar Narra, Efat Jokar, Yaw-Wen Yang, Eric Wei-Guang Diau

TOC Graphic

ACS Energy Letters
DOI: 10.1021/acsenergylett.8b01046
16 Aug 13:33

[ASAP] Two-Dimensional Perovskite Solar Cells with 14.1% Power Conversion Efficiency and 0.68% External Radiative Efficiency

by Weifei Fu, Jian Wang, Lijian Zuo, Ke Gao, Feng Liu, David S. Ginger, Alex K.-Y. Jen

TOC Graphic

ACS Energy Letters
DOI: 10.1021/acsenergylett.8b01181
16 Aug 13:27

[ASAP] High Mobility Indium Oxide Electron Transport Layer for an Efficient Charge Extraction and Optimized Nanomorphology in Organic Photovoltaics

by Wenchao Huang, Bowen Zhu, Sheng-Yung Chang, Shuanglin Zhu, Pei Cheng, Yao-Tsung Hsieh, Lei Meng, Rui Wang, Chaochen Wang, Chenhui Zhu, Christopher McNeill, Mingkui Wang, Yang Yang

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.8b02452
16 Aug 12:33

2D perovskite stabilized phase-pure formamidinium perovskite solar cells

by Jin-Wook Lee

2D perovskite stabilized phase-pure formamidinium perovskite solar cells

2D perovskite stabilized phase-pure formamidinium perovskite solar cells, Published online: 01 August 2018; doi:10.1038/s41467-018-05454-4

Utilizing mixed-cation-halide can improve stability of the formamidinium perovskite films and devices but sacrifices the photocurrent due to an increase in bandgap. Here Lee et al. introduced small amounts of 2D perovskite to obtain high efficiency and stability based on phase-pure formamidinium based perovskite.
12 Jul 01:18

Efficient and stable tandem luminescent solar concentrators based on carbon dots and perovskite quantum dots

Publication date: August 2018

Source: Nano Energy, Volume 50

Author(s): Haiguang Zhao, Daniele Benetti, Xin Tong, Hui Zhang, Yufeng Zhou, Guiju Liu, Dongling Ma, Shuhui Sun, Zhiming M. Wang, Yiqian Wang, Federico Rosei

Abstract

Luminescent solar concentrator (LSC) can serve as large-area sunlight collectors, suitable for applications in building-integrated high-efficiency and low-cost photovoltaics. Inorganic perovskite quantum dots (QDs) are promising candidates as absorbers/emitters in LSCs, due to their high quantum yields (close to 100%), possibility of tuning size and chemical composition and broad absorption spectrum and high absorption coefficient. However, despite their great potential for technological development, LSCs fabricated using colloidal perovskite QDs still face major challenges such as low optical efficiency and limited long-term stability. Here we report a large-area (~ 100 cm2) tandem LSC based on nearly reabsorption-free carbon dots (C-dots) and inorganic mixed-halide perovskite QDs spectrally-tuned for optimal solar-spectrum splitting. The as-fabricated semi-transparent device, without involving any complicated processes, exhibits an external optical efficiency of ~ 3% under sunlight illumination (100 mW/cm2), which represents a 27% enhancement in efficiency over single layer LSCs based on CsPb(BrxI1-x)3 QDs and 117% over CsPb(ClxBr1-x)3 QDs. Our work shows that the addition of C-dots can dramatically enhance the long-term durability of LSC devices based on perovskite QDs due to their excellent photostability and simultaneous absorption of ultraviolet light.

Graphical abstract

fx1

12 Jul 01:09

Designing ternary blend all-polymer solar cells with an efficiency of over 10% and a fill factor of 78%

Publication date: September 2018

Source: Nano Energy, Volume 51

Author(s): Zhenye Li, Lei Ying, Ruihao Xie, Peng Zhu, Ning Li, Wenkai Zhong, Fei Huang, Yong Cao

Abstract

In recent years, ternary blend bulk-heterojunction (BHJ) all-polymer solar cells have been gradually developed to better utilize the solar irradiance spectrum. However, power conversion efficiencies remain below 10%, mainly because of the low fill factor. Generally, the fill factor of all-polymer solar cells is limited mainly by the competition between the recombination and extraction of free charges. Here, we design advanced ternary blend all-polymer solar cells with a high fill factor of 78%, thus demonstrating how such recombination thresholds can be overcome. These results can be attributed to the high and balanced bulk charge mobility, reduced recombination, and optimized morphology, as well as the intimate mixing properties of the two donors in the photoactive layer.

Graphical abstract

fx1

12 Jul 01:08

Printing organic photovoltaics

by Giulia Tregnago

Printing organic photovoltaics

Printing organic photovoltaics, Published online: 10 July 2018; doi:10.1038/s41560-018-0212-2

Printing organic photovoltaics
14 Jun 01:23

Relating open-circuit voltage losses to the active layer morphology and contact selectivity in organic solar cells

J. Mater. Chem. A, 2018, 6,12574-12581
DOI: 10.1039/C8TA01195H, Paper
Zheng Tang, Jing Wang, Armantas Melianas, Yang Wu, Renee Kroon, Weiwei Li, Wei Ma, Mats R. Andersson, Zaifei Ma, Wanzhu Cai, Wolfgang Tress, Olle Inganas
By manipulating the active-layer morphologies in OSCs, we achieve different open-circuit-voltages without affecting the energy of charge-transfer state.
The content of this RSS Feed (c) The Royal Society of Chemistry
13 Jun 01:34

A fluorine-modulated bulk-phase heterojunction and tolerance factor for enhanced performance and structure stability of cesium lead halide perovskite solar cells

J. Mater. Chem. A, 2018, 6,13263-13270
DOI: 10.1039/C8TA02899K, Paper
Lin Fu, Yanan Zhang, Bohong Chang, Bo Li, Shujie Zhou, Luyuan Zhang, Longwei Yin
The α-/δ-phase heterojunction induced by fluorine builds a matched band structure, exhibiting a champion PCE of 10.26% with improved stability.
The content of this RSS Feed (c) The Royal Society of Chemistry
13 Jun 01:34

Control over Self‐Doping in High Band Gap Perovskite Films

by Michael Kulbak , Igal Levine , Einav Barak‐Kulbak , Satyajit Gupta , Arava Zohar , Isaac Balberg , Gary Hodes , David Cahen
Advanced Energy Materials, Volume 8, Issue 23, August 16, 2018.
13 Jun 01:33

Highly Efficient 2D/3D Hybrid Perovskite Solar Cells via Low‐Pressure Vapor‐Assisted Solution Process

by Ming‐Hsien Li , Hung‐Hsiang Yeh , Yu‐Hsien Chiang , U‐Ser Jeng , Chun‐Jen Su , Hung‐Wei Shiu , Yao‐Jane Hsu , Nobuhiro Kosugi , Takuji Ohigashi , Yu‐An Chen , Po‐Shen Shen , Peter Chen , Tzung‐Fang Guo
Advanced Materials, EarlyView.
13 Jun 01:33

Grain‐Boundary “Patches” by In Situ Conversion to Enhance Perovskite Solar Cells Stability

by Lang Liu , Sheng Huang , Yue Lu , Pengfei Liu , Yizhou Zhao , Congbo Shi , Siyu Zhang , Jiafeng Wu , Haizheng Zhong , Manling Sui , Huanping Zhou , Haibo Jin , Yujing Li , Qi Chen
Advanced Materials, EarlyView.
13 Jun 01:33

Room‐Temperature Triple‐Ligand Surface Engineering Synergistically Boosts Ink Stability, Recombination Dynamics, and Charge Injection toward EQE‐11.6% Perovskite QLEDs

by Jizhong Song , Jinhang Li , Leimeng Xu , Jianhai Li , Fengjuan Zhang , Boning Han , Qingsong Shan , Haibo Zeng
Advanced Materials, EarlyView.
13 Jun 01:10

[ASAP] Reduced Charge-Transfer Threshold in Dye-Sensitized Solar Cells with an Au@Ag/N3/n-TiO2 Structure As Revealed by Surface-Enhanced Raman Scattering

by Xiaolei Wang, Xiao Xia Han, Hao Ma, Peng Li, Xueliang Li, Yasutaka Kitahama, Bing Zhao, Yukihiro Ozaki

TOC Graphic

The Journal of Physical Chemistry C
DOI: 10.1021/acs.jpcc.8b02197
13 Jun 01:09

[ASAP] Humidity-Induced Photoluminescence Hysteresis in Variable Cs/Br Ratio Hybrid Perovskites

by John M. Howard, Elizabeth M. Tennyson, Sabyasachi Barik, Rodrigo Szostak, Edo Waks, Michael F. Toney, Ana F. Nogueira, Bernardo R. A. Neves, Marina S. Leite

TOC Graphic

The Journal of Physical Chemistry Letters
DOI: 10.1021/acs.jpclett.8b01357
12 Jun 08:43

[ASAP] Predictable Particle Engineering: Programming the Energy Level, Carrier Generation, and Conductivity of Core–Shell Particles

by Conghui Yuan, Tong Wu, Jie Mao, Ting Chen, Yuntong Li, Min Li, Yiting Xu, Birong Zeng, Weiang Luo, Lingke Yu, Gaofeng Zheng, Lizong Dai

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.8b03010
12 Jun 08:38

[ASAP] Inter-Backbone Charge Transfer as Prerequisite for Long-Range Conductivity in Perylene Bisimide Hydrogels

by Max Burian, Francesco Rigodanza, Nicola Demitri, Luka D?ord?evic, Silvia Marchesan, Tereza Steinhartova, Ilse Letofsky-Papst, Ivan Khalakhan, Eléonore Mourad, Stefan A. Freunberger, Heinz Amenitsch, Maurizio Prato, Zois Syrgiannis

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.8b01689
12 Jun 08:35

[ASAP] Relating Photoelectrochemistry and Wettability of Sputtered Cu- and N-Doped TiO2 Thin Films via an Integrated Approach

by Corrado Garlisi, Chia-Yun Lai, Leslie George, Matteo Chiesa, Giovanni Palmisano

TOC Graphic

The Journal of Physical Chemistry C
DOI: 10.1021/acs.jpcc.8b03650
12 Jun 08:32

[ASAP] Enhancing Luminescence and Photostability of CsPbBr3 Nanocrystals via Surface Passivation with Silver Complex

by Hongbo Li, Yang Qian, Xing Xing, Jianfeng Zhu, Xinyu Huang, Qiang Jing, Weihua Zhang, Chunfeng Zhang, Zhenda Lu

TOC Graphic

The Journal of Physical Chemistry C
DOI: 10.1021/acs.jpcc.8b04569
12 Jun 08:28

[ASAP] “Intact” Carrier Doping by Pump–Pump–Probe Spectroscopy in Combination with Interfacial Charge Transfer: A Case Study of CsPbBr3 Nanocrystals

by Junhui Wang, Tao Ding, Jing Leng, Shengye Jin, Kaifeng Wu

TOC Graphic

The Journal of Physical Chemistry Letters
DOI: 10.1021/acs.jpclett.8b01132
12 Jun 08:26

[ASAP] Tuning the Optoelectronic Properties of Two-Dimensional Hybrid Perovskite Semiconductors with Alkyl Chain Spacers

by Claudio Quarti, Nadège Marchal, David Beljonne

TOC Graphic

The Journal of Physical Chemistry Letters
DOI: 10.1021/acs.jpclett.8b01309
12 Jun 08:24

[ASAP] Novel Plasma-Assisted Low-Temperature-Processed SnO2 Thin Films for Efficient Flexible Perovskite Photovoltaics

by Anand S. Subbiah, Nripan Mathews, Subodh Mhaisalkar, Shaibal K. Sarkar

TOC Graphic

ACS Energy Letters
DOI: 10.1021/acsenergylett.8b00692
12 Jun 08:24

[ASAP] Nonfullerene Polymer Solar Cells Based on a Main-Chain Twisted Low-Bandgap Acceptor with Power Conversion Efficiency of 13.2%

by Weiping Wang, Baofeng Zhao, Zhiyuan Cong, Yuan Xie, Haimei Wu, Quanbin Liang, Sha Liu, Feng Liu, Chao Gao, Hongbin Wu, Yong Cao

TOC Graphic

ACS Energy Letters
DOI: 10.1021/acsenergylett.8b00627
12 Jun 08:23

Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiency

by Florent Sahli

Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiency

Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiency, Published online: 11 June 2018; doi:10.1038/s41563-018-0115-4

An optimized two-step deposition process allows the formation of uniform layers of metal halide perovskites on textured silicon layers, enabling tandem silicon/perovskite solar cells with improved optical design and efficiency.