Journal ArticleDOI
A series of simple oligomer-like small molecules based on oligothiophenes for solution-processed solar cells with high efficiency.
Bin Kan,Miaomiao Li,Qian Zhang,Feng Liu,Xiangjian Wan,Yunchuang Wang,Wang Ni,Guankui Long,Xuan Yang,Huanran Feng,Yi Zuo,Mingtao Zhang,Fei Huang,Yong Cao,Thomas P. Russell,Yongsheng Chen +15 more
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TLDR
The results demonstrate that a fine and balanced modification/design of chemical structure can make significant performance differences and that the performance of solution-processed small-molecule-based solar cells can be comparable to or even surpass that of their polymer counterparts.Abstract:
A series of acceptor-donor-acceptor simple oligomer-like small molecules based on oligothiophenes, namely, DRCN4T-DRCN9T, were designed and synthesized. Their optical, electrical, and thermal properties and photovoltaic performances were systematically investigated. Except for DRCN4T, excellent performances were obtained for DRCN5T-DRCN9T. The devices based on DRCN5T, DRCN7T, and DRCN9T with axisymmetric chemical structures exhibit much higher short-circuit current densities than those based on DRCN6T and DRCN8T with centrosymmetric chemical structures, which is attributed to their well-developed fibrillar network with a feature size less than 20 nm. The devices based on DRCN5T/PC71BM showed a notable certified power conversion efficiency (PCE) of 10.10% under AM 1.5G irradiation (100 mW cm(-2)) using a simple solution spin-coating fabrication process. This is the highest PCE for single-junction small-molecule-based organic photovoltaics (OPVs) reported to date. DRCN5T is a rather simpler molecule compared with all of the other high-performance molecules in OPVs to date, and this might highlight its advantage in the future possible commercialization of OPVs. These results demonstrate that a fine and balanced modification/design of chemical structure can make significant performance differences and that the performance of solution-processed small-molecule-based solar cells can be comparable to or even surpass that of their polymer counterparts.read more
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Difluorobenzothiadiazole-Based Small-Molecule Organic Solar Cells with 8.7% Efficiency by Tuning of π-Conjugated Spacers and Solvent Vapor Annealing
Jin-Liang Wang,Fei Xiao,Jun Yan,Zhuo Wu,Kai-Kai Liu,Zheng-Feng Chang,Ru-Bo Zhang,Hui Chen,Hongbin Wu,Yong Cao +9 more
TL;DR: In this article, a series of tetrafluorine-substituted, wide-bandgap, small molecules consisting of various π-conjugated spacers (furan, thiophene, selenophene) between indacenodithiophene as the electrondonating core and the electron-deficient difluorobenzothiadiazole unit is reported and the effect of the πconjugation spacer on the photovoltaic properties is investigated.
Journal ArticleDOI
Oligothiophene-Bridged Conjugated Covalent Organic Frameworks
Niklas Keller,Derya Bessinger,Stephan Reuter,Mona Calik,Laura Ascherl,Fabian C. Hanusch,Florian Auras,Florian Auras,Thomas Bein +8 more
TL;DR: This work has developed a new building block design employing an asymmetric modification on an otherwise symmetric backbone that allows them to construct a series of highly crystalline quaterthiophene-derived COFs with tunable electronic properties.
Journal ArticleDOI
Time-Dependent Morphology Evolution of Solution-Processed Small Molecule Solar Cells during Solvent Vapor Annealing
Jie Min,Xuechen Jiao,Ibrahim Ata,Andres Osvet,Tayebeh Ameri,Peter Bäuerle,Harald Ade,Christoph J. Brabec +7 more
TL;DR: In this article, the authors investigated the dynamics of the BHJ evolution as a function of solvent vapor annealing (SVA) treatment and found that donor crystallinity is improved as SVA time increases, along with enhanced domain purity and reduced recombination losses.
Journal ArticleDOI
π-Bridge-Independent 2-(Benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile-Substituted Nonfullerene Acceptors for Efficient Bulk Heterojunction Solar Cells
Kai Wang,Yuliar Firdaus,Maxime Babics,Federico Cruciani,Qasim Saleem,Abdulrahman El Labban,Maha A. Alamoudi,Tomasz Marszalek,Wojciech Pisula,Wojciech Pisula,Frédéric Laquai,Pierre M. Beaujuge +11 more
TL;DR: In this article, the authors show that 2-(benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile (BM)-terminated SM acceptors can achieve efficiencies as high as 5.3% in BHJ solar cells with the polymer donor PCE10.
Journal ArticleDOI
Dual-Accepting-Unit Design of Donor Material for All-Small-Molecule Organic Solar Cells with Efficiency Approaching 11%
Yong Huo,Xiao-Ting Gong,Tsz-Ki Lau,Tong Xiao,Cenqi Yan,Xinhui Lu,Guanghao Lu,Xiaowei Zhan,Hao-Li Zhang,Hao-Li Zhang +9 more
TL;DR: In this paper, a dual accepting unit medium-bandgap small molecule donor named SBDT-BDD is developed, which consists of a benzodithiophene (BDT) as the central electron-donating unit in combination with two rhodanines (A1) and two benzo-[1,2-c:4,5-c′]dithiopane-4,8-diones (BDD) (A2) forming a unique A1-A2-D-A 2-A1 structure.
References
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Journal ArticleDOI
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Journal ArticleDOI
A polymer tandem solar cell with 10.6% power conversion efficiency
Jingbi You,Letian Dou,Ken Yoshimura,Takehito Kato,Kenichiro Ohya,Tom Moriarty,Keith Emery,Chun-Chao Chen,Jing Gao,Gang Li,Yang Yang +10 more
TL;DR: The development of a high-performance low bandgap polymer that enables a solution processed tandem solar cell with certified 10.6% power conversion efficiency under standard reporting conditions, which is the first certified polymer solar cell efficiency over 10%.
Journal ArticleDOI
Molecular design of photovoltaic materials for polymer solar cells: toward suitable electronic energy levels and broad absorption.
TL;DR: This Account discusses the basic requirements and scientific issues in the molecular design of high efficiency photovoltaic molecules, and summarizes recent progress in electronic energy level engineering and absorption spectral broadening of the donor and acceptor photvoltaic materials by my research group and others.
Journal ArticleDOI
Simultaneous Enhancement of Open-Circuit Voltage, Short-Circuit Current Density, and Fill Factor in Polymer Solar Cells
Zhicai He,Chengmei Zhong,Xun Huang,Wai Yeung Wong,Hongbin Wu,Liwei Chen,Shi-Jian Su,Yong Cao +7 more
TL;DR: Simultaneous enhancement of open-circuit voltage, short-circuits current density, and fill factor in highly efficient polymer solar cells by incorporating an alcohol/water-soluble conjugated polymer as cathode interlayer is domonstrated.