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Issue 1, 2013
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New benzotrithiophene derivative with a broad band gap for high performance polymer solar cells

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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

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The article was received on 25 Sep 2012, accepted on 25 Oct 2012 and first published on 25 Oct 2012


Article type: Communication
DOI: 10.1039/C2PY20786A
Polym. Chem., 2013,4, 57-60

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    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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