Journal ArticleDOI
Side Chain Engineering on Medium Bandgap Copolymers to Suppress Triplet Formation for High-Efficiency Polymer Solar Cells.
Lingwei Xue,Lingwei Xue,Yankang Yang,Jianqiu Xu,Jianqiu Xu,Chunfeng Zhang,Chunfeng Zhang,Haijun Bin,Zhi-Guo Zhang,Beibei Qiu,Xiaojun Li,Chenkai Sun,Liang Gao,Jia Yao,Xiaofeng Chen,YunXu Yang,Min Xiao,Min Xiao,Yongfang Li,Yongfang Li +19 more
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TLDR
It is demonstrated difluoro-substitution of thiophene conjugated side chain on donor polymer can suppress triplet formation for reducing carrier recombination and indicates that side chain engineering can provide a new solution to suppress carrier recombinations toward high efficiency.Abstract:
Suppression of carrier recombination is critically important in realizing high-efficiency polymer solar cells. Herein, it is demonstrated difluoro-substitution of thiophene conjugated side chain on donor polymer can suppress triplet formation for reducing carrier recombination. A new medium bandgap 2D-conjugated D-A copolymer J91 is designed and synthesized with bi(alkyl-difluorothienyl)-benzodithiophene as donor unit and fluorobenzotriazole as acceptor unit, for taking the advantages of the synergistic fluorination on the backbone and thiophene side chain. J91 demonstrates enhanced absorption, low-lying highest occupied molecular orbital energy level, and higher hole mobility, in comparison with its control polymer J52 without fluorination on the thiophene side chains. The transient absorption spectra indicate that J91 can suppress the triplet formation in its blend film with n-type organic semiconductor acceptor m-ITIC (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone)-5,5,11,11-tetrakis(3-hexylphenyl)-dithieno[2,3-d:2,3'-d']-s-indaceno[1,2-b:5,6-b']-dithiophene). With these favorable properties, a higher power conversion efficiency of 11.63% with high VOC of 0.984 V and high JSC of 18.03 mA cm-2 is obtained for the polymer solar cells based on J91/m-ITIC with thermal annealing. The improved photovoltaic performance by thermal annealing is explained from the morphology change upon thermal annealing as revealed by photoinduced force microscopy. The results indicate that side chain engineering can provide a new solution to suppress carrier recombination toward high efficiency, thus deserves further attention.read more
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Chain Engineering of Benzodifuran-Based Wide-Bandgap Polymers for Efficient Non-Fullerene Polymer Solar Cells.
Ruoxi Zhu,Zhen Wang,Yueyue Gao,Zhi Zheng,Fengyun Guo,Shiyong Gao,Kun Lu,Liancheng Zhao,Yong Zhang,Yong Zhang +9 more
TL;DR: Two novel benzo[1,2-b:4,5-b' ]difuran (BDF)-based wide-bandgap polymers, PBDFT-FBz and PBDFF- FBz, featuring a difluorobenzotriazole (FBz) acceptor unit, exhibit highly promising photovoltaic performance.
Journal ArticleDOI
Sequentially Fluorinated Polythiophene Donors for High‐Performance Organic Solar Cells with 16.4% Efficiency
Dahyun Jeong,Dongchan Lee,S. J. Seo,Seungjin Lee,Da-Som Han,Hyeonjung Park,Biwu Ma,Shin uk Cho,Bumjoon J. Kim +8 more
TL;DR: In this article , two sequentially fluorinated polythiophenes (PTs) donors (PT•2F and PT•4F) are designed to contain two and four fluorine atoms, respectively, per repeating unit to decrease their highest occupied molecular orbital energy levels and increase the opencircuit voltages of the OSCs.
Journal ArticleDOI
Carbon–oxygen-bridged hexacyclic non-fullerene acceptors with chlorinated end groups
Tao Liu,Qiaoqiao Zhao,Huan Wang,Jianfei Qu,Pengjie Chao,Nan Zheng,Hanjian Lai,Daize Mo,Feng He +8 more
TL;DR: In this article, three new chlorine substituted non-fullerene acceptors (COi6-2Cl-γ, COi6 2Cl-δ and COi 6-2CL-m) were designed and synthesized, showing ultra-narrow bandgaps as low as 1.31 eV.
Journal ArticleDOI
Effects of Heteroatom Substitution on the Photovoltaic Performance of Donor Materials in Organic Solar Cells
Journal ArticleDOI
Thioether Bond Modification Enables Boosted Photovoltaic Performance of Nonfullerene Polymer Solar Cells.
Youdi Zhang,Ying Wang,Tao Yang,Tao Liu,Yiqun Xiao,Xinhui Lu,He Yan,Zhongyi Yuan,Yiwang Chen,Yongfang Li +9 more
TL;DR: In this article, a small-molecule nonfullerene acceptor, ITIC-S, bearing a fused heptacyclic benzodi(cyclopentadithiophene) core with a thioether-bond-substituted thiophene, is designed, synthesized, and compared with its alkyl-substantituted analog.
References
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