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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A three-dimensional thiophene-annulated perylene bisimide as a fullerene-free acceptor for a high performance polymer solar cell with the highest PCE of 8.28% and a VOC over 1.0 V
TL;DR: In this article, a propeller-shaped small-molecule acceptor of BPT-S with S-annulated perylene bisimide (PBI) as peripheral groups was designed and synthesized.
Journal ArticleDOI
Molecular engineering of acceptors to control aggregation for optimized nonfullerene solar cells
Linqiang Yang,Zhenghao Hu,Zhuohan Zhang,Jinru Cao,Hongtao Wang,Jiangsheng Yu,Fujun Zhang,Weihua Tang +7 more
TL;DR: In this article, dual molecular engineering of alkyl side chains and halogen accepting ends of asymmetric fused-ring acceptors has been proposed for controlling aggregation for optimized organic solar cells (OSCs).
Journal ArticleDOI
Achieving Balanced Charge Transport and Favorable Blend Morphology in Non-Fullerene Solar Cells via Acceptor End Group Modification
Minghui Hao,Tao Liu,Tao Liu,Yiqun Xiao,Lik Kuen Ma,Guangye Zhang,Cheng Zhong,Zhanxiang Chen,Zhenghui Luo,Xinhui Lu,He Yan,Lei Wang,Chuluo Yang,Chuluo Yang +13 more
TL;DR: In this article, a new end-capping group (EG) was reported, namely 5-fluoro-6-methyl-3-dicycanovinylindan-1-one (CFDCI), which simultaneously possesses an electron-withdrawing fluorine substitute and an electrondonating methyl group.
Journal ArticleDOI
Effect of Side-Chain Engineering of Bithienylbenzodithiophene-alt-fluorobenzotriazole-Based Copolymers on the Thermal Stability and Photovoltaic Performance of Polymer Solar Cells
He Huang,Haijun Bin,Zhengxing Peng,Beibei Qiu,Chenkai Sun,Alexander Liebman-Peláez,Zhi-Guo Zhang,Chenhui Zhu,Harald Ade,Zhanjun Zhang,Yongfang Li,Yongfang Li +11 more
TL;DR: Wang et al. as discussed by the authors designed and synthesized three new 2D-conjugated polymers J62, J63, and J64 with different types of side chains to further investigate the effect of side chain on their physicochemical and photovoltaic properties.
Journal ArticleDOI
As‐Cast Ternary Organic Solar Cells Based on an Asymmetric Side‐Chains Featured Acceptor with Reduced Voltage Loss and 14.0% Efficiency
Xuebin Chen,Xuebin Chen,Bin Kan,Yuanyuan Kan,Ming Zhang,Sae Byeok Jo,Ke Gao,Francis Lin,Feng Liu,Xiaobin Peng,Yong Cao,Alex K.-Y. Jen,Alex K.-Y. Jen +12 more
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