Issue 1, 2018

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 an electron-deficient end 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 °C for 10 min, an optimal power conversion efficiency (PCE) of 4.45% 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.

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

Supplementary files

Article information

Article type
Research Article
Submitted
04 Leo 2017
Accepted
13 Pun 2017
First published
14 Pun 2017

Mater. Chem. Front., 2018,2, 136-142

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., 2018, 2, 136 DOI: 10.1039/C7QM00403F

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