Issue 11, 2013
From the journal:

Polymer Chemistry

Benzotrithiophene and benzodithiophene-based polymers for efficient polymer solar cells with high open-circuit voltage†

Guobing Zhang,*a   Jianyu Yuan,b   Peng Li,ac   Jingxuan Ma,c   Hongbo Lu,a   Longzhen Qiu*a  and  Wanli Ma*b  

* Corresponding authors

a Key Lab of Special Display Technology, Ministry of Education, National Engineering Lab of Special Display Technology, State Key Lab of Advanced Display Technology, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, China
E-mail: gbzhang@hfut.edu.cn, lzqiu@ustc.edu

b Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu 215123, P. R. China
E-mail: wlma@suda.edu.cn

c Department of polymer Science and Engineering, School of chemistry and chemical Engineering, Hefei University of Technology, Hefei, China

Abstract

Two new conjugated polymers based on benzodithiophene (BDT) and alkyl-benzotrithiophene (alkyl-BTT, P1), or acyl-benzotrithiophene (acyl-BTT, P2) were synthesized by a Stille cross-coupling reaction. The polymers were characterized by gel permeation chromatography (GPC), ultraviolet-visible (UV-vis) absorption as well as electrochemical cyclic voltammetry (CV) tests. Compared to the alkyl-BTT-based polymer (P1), the acyl-BTT-based polymer (P2) displayed a lower optical bandgap and a lower HOMO energy level. Polymer solar cells (PSCs) also confirmed that P2-based devices possessed better photovoltaic properties than those of P1-based devices. The optimized photovoltaic devices were fabricated with an active layer of a blend P2 and PC71BM using 2 vol% 1,8-diiodooctane (DIO) as a solvent additive, and a PCE of 4.20% was obtained, with a Voc as high as 0.96 V under AM 1.5G illumination at 100 mW cm−2 with a solar simulator.

Graphical abstract: Benzotrithiophene and benzodithiophene-based polymers for efficient polymer solar cells with high open-circuit voltage

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Article information

DOI
https://doi.org/10.1039/C3PY00251A
Article type
Paper
Submitted
20 Feb 2013
Accepted
21 Mar 2013
First published
22 Mar 2013

Polym. Chem., 2013,4, 3390-3397

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Benzotrithiophene and benzodithiophene-based polymers for efficient polymer solar cells with high open-circuit voltage

G. Zhang, J. Yuan, P. Li, J. Ma, H. Lu, L. Qiu and W. Ma, Polym. Chem., 2013, 4, 3390 DOI: 10.1039/C3PY00251A

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