Synthesis, characterization and photovoltaic performances of D–A copolymers based on BDT and DBPz: the largely improved performance caused by additional thiophene blocks

Shuang Li; Baofeng Zhao; Zhicai He; Su'an Chen; Jian Yu; Aoshu Zhong; Runli Tang; Hongbin Wu; Qianqian Li; Jingui Qin; Zhen Li

doi:10.1039/C3TA01305G

Synthesis, characterization and photovoltaic performances of D–A copolymers based on BDT and DBPz: the largely improved performance caused by additional thiophene blocks

Shuang Li,^a Baofeng Zhao,^b Zhicai He,^b Su'an Chen,^a Jian Yu,^a Aoshu Zhong,^a Runli Tang,^a Hongbin Wu,*^b Qianqian Li,^a Jingui Qin^a and Zhen Li*^a

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* Corresponding authors

^a Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China
E-mail: lizhen@whu.edu.cn, lichemlab@163.com

^b College of Materials Science, South China University of Technology, Guangzhou 510640, China
E-mail: hbwu@scut.edu.cn

Abstract

Two new low bandgap copolymers, PBDT-DBPz and PBDT-DTDBPz, were prepared, in which the only difference was the additional added thiophene bridge between the BDT donor unit and DBPz acceptor unit for PBDT-DTDBPz. In addition to the improvements of UV-vis absorption and hole mobility, the PSC based on PBDT-DTDBPz:PC₇₁BM demonstrated a power conversion efficiency of 4.75%, much higher than that of the device based on PBDT-DBPz:PC₇₁BM (0.46%), under the same experimental conditions.

Journal of Materials Chemistry A

Synthesis, characterization and photovoltaic performances of D–A copolymers based on BDT and DBPz: the largely improved performance caused by additional thiophene blocks

Abstract

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Synthesis, characterization and photovoltaic performances of D–A copolymers based on BDT and DBPz: the largely improved performance caused by additional thiophene blocks

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