Journal ArticleDOI
Efficient Nonfullerene Polymer Solar Cells Enabled by a Novel Wide Bandgap Small Molecular Acceptor.
Guangjun Zhang,Guofang Yang,He Yan,Joo-Hyun Kim,Harald Ade,Wenlin Wu,Xiaopeng Xu,Yuwei Duan,Qiang Peng +8 more
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TLDR
A wide bandgap small molecular acceptor, SFBRCN, containing a 3D spirobifluorene core flaked with a 2,1,3-benzothiadiazole (BT) and end-capped with highly electron-deficient RCN units, has been successfully synthesized as a small molecularacceptor (SMA) for nonfullerene polymer solar cells (PSCs).Abstract:
A wide bandgap small molecular acceptor, SFBRCN, containing a 3D spirobifluorene core flaked with a 2,1,3-benzothiadiazole (BT) and end-capped with highly electron-deficient (3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile (RCN) units, has been successfully synthesized as a small molecular acceptor (SMA) for nonfullerene polymer solar cells (PSCs). This SMA exhibits a relatively wide optical bandgap of 2.03 eV, which provides a complementary absorption to commonly used low bandgap donor polymers, such as PTB7-Th. The strong electron-deficient BT and RCN units afford SFBRCN with a low-lying LUMO (lowest unoccupied molecular orbital) level, while the 3D structured spirobifluorene core can effectively suppress the self-aggregation tendency of the SMA, thus yielding a polymer:SMA blend with reasonably small domain size. As the results of such molecular design, SFBRCN enables nonfullerene PSCs with a high efficiency of 10.26%, which is the highest performance reported to date for a large bandgap nonfullerene SMA.read more
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Journal ArticleDOI
Non-fullerene acceptors for organic solar cells
TL;DR: Non-fullerene acceptors (NFAs) are currently a major focus of research in the development of bulk-heterojunction organic solar cells (OSCs) as mentioned in this paper.
Journal ArticleDOI
Nonfullerene Acceptor Molecules for Bulk Heterojunction Organic Solar Cells
Guangye Zhang,Jingbo Zhao,Philip C. Y. Chow,Kui Jiang,Jianquan Zhang,Zonglong Zhu,Jie Zhang,Fei Huang,He Yan,He Yan +9 more
TL;DR: Progress is summarized, aiming to describe the molecular design strategy, to provide insight into the structure-property relationship, and to highlight the challenges the field is facing, with emphasis placed on most recent nonfullerene acceptors that demonstrated top-of-the-line photovoltaic performances.
Journal ArticleDOI
Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors.
Hao Zhang,Huifeng Yao,Junxian Hou,Jie Zhu,Jianqi Zhang,Wanning Li,Runnan Yu,Bowei Gao,Shaoqing Zhang,Jianhui Hou,Jianhui Hou +10 more
TL;DR: Chlorination demonstrates effective ability in enhancing the device performance and facile synthesis route, which both deserve further exploitation in the modification of photovoltaic materials.
Journal ArticleDOI
Realizing Over 13% Efficiency in Green-Solvent-Processed Nonfullerene Organic Solar Cells Enabled by 1,3,4-Thiadiazole-Based Wide-Bandgap Copolymers
TL;DR: Two novel wide-bandgap copolymers, PBDT-TDZ and PBDTS- TDZ, are developed based on 1,3,4-thiadiazole (TDZ) and benzo[1,2-b:4,5-b']dithiophene (BDT) building blocks, which exhibit the stronger optical absorption, lower-lying HOMO level, and higher crystallinity.
Journal ArticleDOI
Improved Charge Transport and Reduced Nonradiative Energy Loss Enable Over 16% Efficiency in Ternary Polymer Solar Cells
TL;DR: This work suggests that utilizing the complementary advantages of fullerene and NFAs is a promising way to finely tune the detailed photovoltaic parameters and further improve the PCEs of PSCs.
References
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Journal ArticleDOI
Determining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells
Gordon J. Hedley,Alexander J. Ward,Alexander Alekseev,Calvyn Travis Howells,Emiliano R. Martins,Luis A. Serrano,Graeme Cooke,Arvydas Ruseckas,Ifor D. W. Samuel +8 more
TL;DR: This work uses nanoscale photocurrent mapping, ultrafast fluorescence and exciton diffusion to observe the detailed morphology of a high-performance blend of PTB7:PC71BM, and shows that optimized blends consist of elongated fullerene-rich and polymer-rich fibre-like domains.
Journal ArticleDOI
Slip-Stacked Perylenediimides as an Alternative Strategy for High Efficiency Nonfullerene Acceptors in Organic Photovoltaics
Patrick E. Hartnett,Amod Timalsina,H. S. S. Ramakrishna Matte,Nanjia Zhou,Xugang Guo,Wei Zhao,Antonio Facchetti,Robert P. H. Chang,Mark C. Hersam,Michael R. Wasielewski,Tobin J. Marks +10 more
TL;DR: Slip-stacked PDI strategies represent a promising approach to fullerene replacements in BHJ OPVs and are found to have the deepest LUMO, intermediate crystallinity, and the most well-mixed domains.
Journal ArticleDOI
Breaking the 10% Efficiency Barrier in Organic Photovoltaics: Morphology and Device Optimization of Well‐Known PBDTTT Polymers
TL;DR: In this paper, a review of the recent advances with respect to five well-known PBDTTT polymers and their design considerations, basic properties, photovoltaic performance, as well as device application in conventional, inverted, tandem solar cells.
Journal ArticleDOI
Highly Efficient Fullerene‐Free Polymer Solar Cells Fabricated with Polythiophene Derivative
Yunpeng Qin,Yunpeng Qin,Mohammad Afsar Uddin,Yu Chen,Bomee Jang,Kang Zhao,Zhong Zheng,Runnan Yu,Tae Joo Shin,Han Young Woo,Jianhui Hou,Jianhui Hou +11 more
TL;DR: A highly efficient fullerene-free polymer solar cell (PSC) based on PDCBT, a polythiophene derivative substituted with alkoxycarbonyl, achieves an impressive power conversion efficiency of 10.16%, which is the best result in PSCs based on polythyphene derivatives to date.
Journal ArticleDOI
High-Performance Non-Fullerene Polymer Solar Cells Based on a Pair of Donor-Acceptor Materials with Complementary Absorption Properties.
Haoran Lin,Shangshang Chen,Zhengke Li,Joshua Yuk Lin Lai,Guofang Yang,Terry McAfee,Kui Jiang,Yunke Li,Yuhang Liu,Huawei Hu,Jingbo Zhao,Wei Ma,Harald Ade,He Yan +13 more
TL;DR: This work provides important guidance to improve the performance of non-fullerene polymer solar cells by combining a large- bandgap polymer PffT2-FTAZ-2DT with a small-bandgap acceptor IEIC.