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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Journal ArticleDOI
An A2–π–A1–π–A2-type small molecule donor for high-performance organic solar cells
Qian Zhang,Yanna Sun,Chen Xianjie,Lin Zhijing,Xin Ke,Xiaoyuan Wang,Tian He,Shouchun Yin,Yongsheng Chen,Huayu Qiu +9 more
TL;DR: In this article, a new small molecule denoted as BDD-IN was synthesized employing a strong electron-withdrawing unit, 3-bis(4-(2-ethylhexyl)-thiophen-2-yl)-5,7-bis (2-methylhexyl)benzo[1,2:4,5-c′]-dithiophene-4,8-dione (BDD), and indenedione (IN) as the end-capped unit.
Book ChapterDOI
Ternary organic solar cells
Xiaoling Ma,Fujun Zhang +1 more
TL;DR: In this paper, the development of ternary OSCs based on different system is summarized, as well as the main working mechanisms and the potential research directions are also highlighted in this chapter.
Journal ArticleDOI
Following the TRMC Trail: Optimization of Photovoltaic Efficiency and Structure-Property Correlation of Thiophene Oligomers.
Tanwistha Ghosh,Tanwistha Ghosh,Anesh Gopal,Shinji Nagasawa,Nila Mohan,Akinori Saeki,Vijayakumar C. Nair,Vijayakumar C. Nair +7 more
TL;DR: Flash photolysis time-resolved microwave conductivity (FP-TRMC) technique shows OT-TT has significantly higher photoconductivity than OT-T and OT-BT implying that the former can outperform the latter two derivatives by a wide margin under identical conditions in a bulk-heterojunction solar cell device.
Journal ArticleDOI
Impact of the alkyl side chain position on the photovoltaic properties of solution-processable organic molecule donor materials
J. Y. Zhang,Xiangwei Zhu,Cheng-Yu He,Haijun Bin,Lingwei Xue,Wankai Wang,Yunhua Yang,N. Y. Yuan,Jianning Ding,Z. X. Wei,Zhenggang Zhang,Yan-Zhou Li +11 more
TL;DR: In this article, two new structured organic molecules with bithienyl-substituted benzodithiophene (BDT) as core and donor unit, indenedione (ID) as the end group and acceptor unit, 3,3′-dihexyl-2,2′:5′, 2′′-terthiophene(3T(3-Hex)) or 4,4′-dihophene-2.2.
Journal ArticleDOI
Crystallization and Optical Compensation by Fluorinated Rod Liquid Crystals for Ternary Organic Solar Cells
TL;DR: In this article, a fluorinate donor-acceptor-donor rod-like liquid crystal (RLC), 5,6-difluoro-4,7-bis(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo (DFBT-TT6), is designed and synthesized as additive for bulk-heterojunction organic solar cells.
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.