Issue 31, 2013
From the journal:

Journal of Materials Chemistry A

Small molecules based on 2,7-carbazole for efficient solution-processed organic solar cells†

Pengcheng Li,ab   Hui Tong,*a   Junqiao Ding,a   Zhiyuan Xiea  and  Lixiang Wang*a  

* Corresponding authors

a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: chemtonghui@ciac.jl.cn, lixiang@ciac.jl.cn
Fax: +86-431-85684937
Tel: +86-431-85262108

b University of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Abstract

A series of small molecules (DTCz-TBT, DTCz-2TBT and DTCz-3TBT) with 2,7-carbazole as a center core donor, benzothiadiazole as acceptor units and oligothiophenes as end-capping units were synthesized and characterized. Their thermal, optical, electrochemical and photovoltaic properties were examined. With increasing the number of the terminal thiophene units and conjugation length, these molecules exhibit red-shifted absorption (529–594 nm), up-shifted HOMO levels (−5.27 to −5.08 eV), and reduced optical band gaps (2.04 to 1.80 eV). Solution processed organic solar cells (OSCs) based on DTCz-TBT/PC71BM exhibit a power conversion efficiency of 2.26% with a high open-circuit voltage up to 1.02 V, while the OSCs based on DTCz-2TBT/PC71BM and DTCz-3TBT/PC71BM exhibit power conversion efficiencies of 3.44% and 3.90% without any post-treatment.

Graphical abstract: Small molecules based on 2,7-carbazole for efficient solution-processed organic solar cells

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Article information

DOI
https://doi.org/10.1039/C3TA11168G
Article type
Paper
Submitted
24 Mar 2013
Accepted
23 May 2013
First published
24 May 2013

J. Mater. Chem. A, 2013,1, 8805-8812

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Small molecules based on 2,7-carbazole for efficient solution-processed organic solar cells

P. Li, H. Tong, J. Ding, Z. Xie and L. Wang, J. Mater. Chem. A, 2013, 1, 8805 DOI: 10.1039/C3TA11168G

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