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
Merocyanines for vacuum-deposited small-molecule organic solar cells
Ko-Wei Chen,Chong-Wei Huang,Shao-Yu Lin,Yi-Hung Liu,Tanmay Chatterjee,Wen-Yi Hung,Shun-Wei Liu,Ken-Tsung Wong,Ken-Tsung Wong +8 more
TL;DR: In this paper, three merocyanines dyes (DPPT, DTPT, 1-NPPT) are functionalized with electron withdrawing thiazolidenemalononitrile and electron rich diarylamine functionalities.
Journal ArticleDOI
Thiophene dendrimer-based low donor content solar cells
Dani M. Stoltzfus,Chang-Qi Ma,Ravi Chandra Raju Nagiri,Andrew J. Clulow,Peter Bäuerle,Paul L. Burn,Ian R. Gentle,Paul Meredith +7 more
TL;DR: In this paper, a third generation dendrimer containing 42 thiophene units (42T) was found to give power conversion efficiencies of up to 3.5% when blended with PC70BM in optimized devices.
Journal ArticleDOI
Controlling Open-Circuit Voltage in Organic Solar Cells by Terminal Fluoro-Functionalization of Narrow-Bandgap π-Conjugated Molecules
TL;DR: In this article, a series of narrow-bandgap π-conjugated small molecules composed of benzodithiophene (BDT) and diketopyrrolopyrrole (DPP) chromophoric units with different electron-withdrawing fluorinated end groups was designed and synthesized as donor materials for systematically studying their structure-property relationship in organic solar cells.
Journal ArticleDOI
Designation and Match of Non-Fullerene Acceptors with X-Shaped Donors toward Organic Solar Cells
Ushna Saeed,Shamsa Bibi,Shafiq urRehman,Shanza Rauf Khan,Muhammad Shoaib,Muhammad Iqbal,Faisal Nawaz,Ran Jia +7 more
Journal ArticleDOI
Theoretical characterization on photoelectric properties of benzothiadiazole- and fluorene-based small molecule acceptor materials for the organic photovoltaics
TL;DR: In this paper, the authors theoretically designed some small molecule acceptors (2∼5) based on fluorene (F), benzothiadiazole, and cyano group (CN) referring to the reported acceptor material 2-[{7-(9,9-di-n-propyl-9H-fluoren-2-yl)benzo[c][1,2,5]thiadiadiazol-4-yl}methylene]malononitrile (1), the crucial parameters affecting photoelectrical properties of compounds
References
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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.
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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
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