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A large-bandgap small-molecule electron acceptor utilizing a new indacenodibenzothiophene core for organic solar cells

Abstract

A weak electron-donating ladder-type heteroarene, indacenodibenzothiophene (IDBT), is designed and synthesized for the development of acceptor-donor-acceptor (A-D-A)-type small-molecule acceptors featuring a large optical bandgap to match high-performance low-bandgap electron donors. Small-molecule acceptor NIDBT based on the IDBT core and 2-(2,3-dihydro-3-oxo-1H-inden-1-ylidene)propanedinitrile as electron-deficient ending group is designed and synthesized. NIDBT shows a wide optical bandgap of 1.84 eV with a high absorption coefficient. A low-bandgap polymer PTB7-Th is selected as the donor to construct photovoltaic devices with NIDBT as the acceptor. After a thermal-annealing treatment at 160 oC for 10 min, an optimal power conversion efficiency (PCE) of 4.45% with with an open-circult voltage (Voc) of 0.831 V, a short-circuit current (Jsc) of 11.45 mA cm-2 and a fill factor (FF) of 46.73% is realized.

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Publication details

The article was received on 04 Sep 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Research Article
DOI: 10.1039/C7QM00403F
Citation: Mater. Chem. Front., 2017, Accepted Manuscript
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    A large-bandgap small-molecule electron acceptor utilizing a new indacenodibenzothiophene core for organic solar cells

    P. Wang, H. Fan, C. Zhang and X. Zhu, Mater. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QM00403F

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