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Featured researches published by Zhiyuan Cong.


RSC Advances | 2016

High performance alternating polymers based on two-dimensional conjugated benzo[1,2-b:4,5-b′]dithiophene and fluorinated dithienylbenzothiadiazole for solar cells

Zhiyuan Cong; Shuo Liu; Baofeng Zhao; Weiping Wang; Hongli Liu; Jin Su; Zhaoqi Guo; Wei Wei; Chao Gao; Zhongwei An

Three donor–acceptor polymers based on two-dimensional conjugated alkylthienyl substituted benzo[1,2-b:4,5-b′]dithiophene (BDTT) and fluorinated 4,7-dialkylthienyl-2,1,3-benzothiadiazole (DTBT) derivatives were synthesized and applied as donor materials for bulk heterojunction solar cells. The effects of fluorine substitution on the absorption properties, energy levels, dielectric constants and photovoltaic properties of the polymers were investigated. We found that the incorporation of fluorine atoms on the DTBT unit can effectively deepen the highest occupied molecular orbital (HOMO) energy level and increase the dielectric constant of the polymers. As a result of these improved properties, a high open-circuit voltage (Voc) of 0.85 V was obtained for the optimal conventional polymer solar cells (PSCs) based on a two-fluorine-substituted analogue P3 blended with [6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) as the active layer (1:1.5), giving rise to a high power conversion efficiency (PCE) of 7.48%. The influences of the molecular weight (MW) of P3 on the device performances were further studied and enhanced photovoltaic parameters were achieved for the medium molecular weight P3 based device, with a corresponding open circuit voltage (Voc) of 0.80 V, short-circuit current density (Jsc) of 14.7 mA cm−2, high fill factor (FF) of 71.9% and the resulting best PCE of 8.47%, verifying that P3 with an appropriate MW should be a promising polymer for highly efficient photovoltaic application.


Journal of Physical Chemistry C | 2013

Highly Efficient Solar Cells Based on the Copolymer of Benzodithiophene and Thienopyrroledione with Solvent Annealing

Bo Qu; Di Tian; Zhiyuan Cong; Weiping Wang; Zhongwei An; Chao Gao; Zhi Gao; Hongsheng Yang; Lipei Zhang; Lixin Xiao; Zhijian Chen; Qihuang Gong


Reactive & Functional Polymers | 2012

A copolymer based on benzo[1,2-b:4,5-b′]dithiophene and quinoxaline derivative for photovoltaic application

Haimei Wu; Bo Qu; Zhiyuan Cong; Hongli Liu; Di Tian; Bowen Gao; Zhongwei An; Chao Gao; Lixin Xiao; Zhijian Chen; Huanhuan Liu; Qihuang Gong; Wei Wei


Synthetic Metals | 2012

Synthesis of two benzo[1,2-b:3,4-b ']dithiophene-based conjugated polymers with different side chains and their applications in photovoltaic devices

Bo Qu; Hongsheng Yang; Di Tian; Hongli Liu; Zhiyuan Cong; Chao Gao; Zhijian Chen; Lixin Xiao; Zhi Gao; Wei Wei; Qihuang Gong


Polymer | 2015

Synthesis of copolymers based on benzo[1,2-b:4,5-b′]difuran and fluorinated quinoxaline derivatives and their photovoltaic properties

Zhiyuan Cong; Baofeng Zhao; Haimei Wu; Zhaoqi Guo; Weiping Wang; Guoping Luo; Jin Xu; Yangjun Xia; Chao Gao; Zhongwei An


Reactive & Functional Polymers | 2013

Synthesis and photovoltaic properties of an alternating polymer based fluorene and fluorine substituted quinoxaline derivatives

Haimei Wu; Bo Qu; Di Tian; Zhiyuan Cong; Bowen Gao; Jianqun Liu; Zhongwei An; Chao Gao; Lixin Xiao; Zhijian Chen; Qihuang Gong; Wei Wei


Reactive & Functional Polymers | 2012

Enhanced open-circuit voltage of two side chain conjugated polythiophene derivatives blended with indene-C-60 bisadduct

Chao Gao; Bo Qu; Dong Chen; Zhiyuan Cong; Jianqun Liu; Jian Chen; Zhongwei An; Zhijian Chen; Lixin Xiao; Wei Wei; Qihuang Gong


ACS energy letters | 2018

Nonfullerene Polymer Solar Cells Based on a Main-Chain Twisted Low-Bandgap Acceptor with Power Conversion Efficiency of 13.2%

Weiping Wang; Baofeng Zhao; Zhiyuan Cong; Yuan Xie; Haimei Wu; Quanbin Liang; Sha Liu; Feng Liu; Chao Gao; Hongbin Wu; Yong Cao


Journal of Applied Polymer Science | 2013

Synthesis of a terpolymer containing fluorene, side chain conjugated thiophene and benzothiadiazole and its applications in photovoltaic devices

Hongli Liu; Bo Qu; Jian Chen; Zhiyuan Cong; Zhongwei An; Chao Gao; Lixin Xiao; Zhijian Chen; Qihuang Gong


ACS Sustainable Chemistry & Engineering | 2018

Absorptive Behaviors and Photovoltaic Performance Enhancements of Alkoxy-Phenyl Modified Indacenodithieno[3,2-b]thiophene-Based Nonfullerene Acceptors

Baofeng Zhao; Weiping Wang; Jingming Xin; Haimei Wu; Hongli Liu; Zhaoqi Guo; Zhiyuan Cong; Wei Ma; Chao Gao

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Chao Gao

Chinese Academy of Sciences

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Wei Wei

Nanjing University of Posts and Telecommunications

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Baofeng Zhao

South China University of Technology

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Haimei Wu

Nanjing University of Posts and Telecommunications

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Bowen Gao

Chinese Academy of Sciences

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