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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Journal ArticleDOI
Triplet Acceptors with a D-A Structure and Twisted Conformation for Efficient Organic Solar Cells
Linqing Qin,Xingzheng Liu,Xin Zhang,Jianwei Yu,Lei Yang,Fenggui Zhao,Miaofei Huang,Kangwei Wang,Xiaoxi Wu,Yuhao Li,Hao Chen,Kai Wang,Jianlong Xia,Xinhui Lu,Feng Gao,Yuanping Yi,Hui Huang +16 more
TL;DR: The mechanism of triplet excitons were investigated to show that the twisted and D‐A structures result in large spin–orbit coupling (SOC) and small energy gap between the singlet and triplet states, and thus efficient intersystem crossing.
Journal ArticleDOI
A wide-bandgap D–A copolymer donor based on a chlorine substituted acceptor unit for high performance polymer solar cells
Tao Wang,Rui Sun,Shengjie Xu,Jie Guo,Wei Wang,Jing Guo,Xuechen Jiao,Jianbo Wang,Shuangfeng Jia,Xiaozhang Zhu,Yongfang Li,Jie Min,Jie Min,Jie Min +13 more
TL;DR: In this paper, a new widebandgap donor-acceptor copolymer, J101, with a downshifted highest occupied molecular orbital (HOMO) level by chlorine substitution on its 2-alkyl-benzo[d][1,2,3]triazole (BTz) unit was developed.
Journal ArticleDOI
Enhancing photovoltaic performance by tuning the domain sizes of a small-molecule acceptor by side-chain-engineered polymer donors
Yu Che Lin,Yi Ju Lu,Cheng Si Tsao,Akinori Saeki,Jia Xing Li,Chung Hao Chen,Hao Cheng Wang,Hsiu Cheng Chen,Dong Meng,Kaung-Hsiung Wu,Yang Yang,Kung-Hwa Wei +11 more
TL;DR: In this article, two new fluorine-substituted polymer donors (BO2FC8, BO2FEH), with different side-chain architectures, and a new chlorine-substantituted small-molecule acceptor (m-ITIC-OR-4Cl) that are capable of simultaneous charge and energy transfer as the binary blend active layer for organic photovoltaics.
Journal ArticleDOI
Fused-Ring Nonfullerene Acceptor Forming Interpenetrating J-Architecture for Fullerene-Free Polymer Solar Cells
Journal ArticleDOI
Enhanced Charge Transfer between Fullerene and Non-Fullerene Acceptors Enables Highly Efficient Ternary Organic Solar Cells
Lingling Zhan,Shuixing Li,Shuhua Zhang,Xingzhi Chen,Tsz-Ki Lau,Xinhui Lu,Minmin Shi,Chang-Zhi Li,Hongzheng Chen +8 more
TL;DR: This work demonstrates efficient and thermally stable ternary OSCs with enhanced charge transfer between fullerene and non-fullerene acceptors via the modulation of energy levels, which helps to better understand the working mechanism of ternaries OSC's.
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