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
New dithienosilole- and dithienogermole-based BODIPY for solar cell applications
Gayathri Thumuganti,Gayathri Thumuganti,Vinay Gupta,Vinay Gupta,Surya Prakash Singh,Surya Prakash Singh +5 more
TL;DR: In this article, the authors report two efficient donor materials for organic solar cells, namely Si-BDP and GeBDP, composed by the union of thienyl Bodipy wings and a dithienosilole/dithienogermole core.
Journal ArticleDOI
Medium-Bandgap Small-Molecule Donors Compatible with Both Fullerene and Nonfullerene Acceptors
Yong Huo,Cenqi Yan,Bin Kan,Xiao-Fei Liu,Li-Chuan Chen,Chen-Xia Hu,Tsz-Ki Lau,Xinhui Lu,Chun-Lin Sun,Xiangfeng Shao,Yongsheng Chen,Xiaowei Zhan,Hao-Li Zhang,Hao-Li Zhang +13 more
TL;DR: The results reveal that rationally designed medium-bandgap small-molecule donors can be applied in high-performance small-Molecule organic solar cells with different types of acceptors.
Journal ArticleDOI
The effect of acceptor end groups on the physical and photovoltaic properties of A–π–D–π–A type oligomers with same S, N-heteropentacene central electron donor unit for solution processed organic solar cells
TL;DR: In this article, the authors used acceptor-donor-acceptor small molecules with different end group acceptors such as dicyanovinyl, cyanoacetate and indenedione, denoted as SM1, SM2 and SM3, linked with same central S, N-heteropentacene donor.
Journal ArticleDOI
A high performance inverted organic solar cell with a low band gap small molecule (p-DTS(FBTTh2)2) using a fullerene derivative-doped zinc oxide nano-film modified with a fullerene-based self-assembled monolayer as the cathode
TL;DR: In this article, the power conversion efficiency (PCE) of bulk heterojunction inverted small molecule solar cells (i-SMSCs) was improved by doping a ZnO cathode with a fullerene derivative (ZnO-C60) followed by a self-assembled monolayer modification on its surface in contact with the active layer.
Journal ArticleDOI
Self-Assembled Organic Materials for Photovoltaic Application
Tanwistha Ghosh,Jayanthy S. Panicker,Jayanthy S. Panicker,Vijayakumar C. Nair,Vijayakumar C. Nair +4 more
TL;DR: Advances in small molecule, oligomer and polymer based systems, wherein supramolecular interactions such as hydrogen-bonding, pi-pi stacking, and dipole-dipole are explored for realizing stable and efficient bulk-heterojunction solar cells are summarized.
References
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Journal ArticleDOI
Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure
TL;DR: In this article, the authors showed that PFN can be incorporated into polymer light-emitting devices (PLEDs) to enhance electron injection from high-work-function metals such as aluminium (work function w of 4.3 eV) and gold (w ¼ 5.2 eV).
Journal ArticleDOI
Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells.
Yuhang Liu,Jingbo Zhao,Zhengke Li,Cheng Mu,Wei Ma,Huawei Hu,Kui Jiang,Haoran Lin,Harald Ade,He Yan +9 more
TL;DR: The uncovered aggregation and design rules yield three high-efficiency (>10%) donor polymers and will allow further synthetic advances and matching of both the polymer and fullerene materials, potentially leading to significantly improved performance and increased design flexibility.
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.