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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The role of branched alkylthio side chain on dispersion and thermoelectric properties of regioregular polythiophene/carbon nanotubes nanocomposites
TL;DR: In this paper , poly(3-alkylthiophene)s (P3ATs) with linear/branched alkyl groups and branched Alkylthio moieties with short/long side chain lengths for dispersing single-walled carbon nanotubes (SWCNTs), and the resulting composites are solution-processed for use as p-type thin film thermoelectric devices.
Journal ArticleDOI
Visible to Near‐Infrared‐Absorbing Polymers Containing Bithiazole and 2,3‐Didodecyl‐6,7‐Difluoroquinoxaline Derivatives for Polymer Solar Cells
Rajalingam Agneeswari,MinSung Kong,Jihoon Lee,Vellaiappillai Tamilavan,Won-Ki Lee,Sung Heum Park,Youngeup Jin +6 more
Journal ArticleDOI
Fluorination of the π-bridge in a polymer skeleton enables a significant improvement in photovoltaic performance
Junxu Liao,Peijin Zheng,Gengbiao Xu,Fubiao Weng,Langxian Zeng,Zhangen Huang,Yongtao Chen,Yu Yang,Jianhao Chen,Zhiwei Qiu,Hongbin Zhao,Yongjun Xu +11 more
TL;DR: In this paper, an easy and efficient approach for the synthesis of an important photoelectric intermediate 3-fluoro-2-iodithiophene is developed, and a polymer J52FF, featuring fluorination of the π-bridges on the backbone and side chains of the classical polymer, J52, is synthesized.
Journal ArticleDOI
Synthesis and properties of mono‐ and di‐fluoro‐substituted 2,3‐didodecylquinoxaline‐based polymers for polymer solar cells
Rajalingam Agneeswari,Yeongkwon Kang,Jihoon Lee,Ji Hyeon Kwon,Vellaiappillai Tamilavan,Seong Soo Park,Sung Heum Park,Youngeup Jin +7 more
Journal ArticleDOI
A comparison of the positional effect of difluorination and the synergistic effect of siloxane-terminated side chains on benzodithiophene-based conjugated polymers for efficient photovoltaic application
TL;DR: In this article , the authors studied the positional effect of halogen and proved that halogenation is one of the most efficient chemical modification strategies to manipulate the energy levels and molecular assembly.
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