Issue 1, 2013

New benzotrithiophene derivative with a broad band gap for high performance polymer solar cells

Abstract

A new planar conjugated polymer, poly{benzo(1,2-b:3,4-b′:5,6-d′′)trithiophene-alt-4,4′-dihexyl-2,2′-bithiazole} (BTT-BTz), with a broad band gap and higher Voc based on benzotrithiophene and bithiazole units, was designed and synthesized. This copolymer possesses a deeper HOMO (−5.65 eV), and after 1,8-diiodoctane treatment, the power conversion efficiency of the photovoltaic device based on the BTT-BTz/PC71BM photoactive layer reaches 5.06% with 0.81 V of open-circuit voltage, 10.9 mA cm−2 of short-circuit current and 0.57 of fill factor, which is the highest one among the conjugated polymers based on BTT or BTz derivatives. This new conjugated copolymer seems a promising candidate for the application in tandem solar cells.

Graphical abstract: New benzotrithiophene derivative with a broad band gap for high performance polymer solar cells

Supplementary files

Article information

Article type
Communication
Submitted
25 Sep 2012
Accepted
25 Oct 2012
First published
25 Oct 2012

Polym. Chem., 2013,4, 57-60

New benzotrithiophene derivative with a broad band gap for high performance polymer solar cells

X. Zhao, D. Yang, H. Lv, L. Yin and X. Yang, Polym. Chem., 2013, 4, 57 DOI: 10.1039/C2PY20786A

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