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Efficient NDT small molecule solar cells with high fill factor using pendant group engineering

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Abstract

Three naphthodithiophene (NDT)-based small molecules, bearing hexyl- (NDT-Hex), null (NDT) and fluorene (NDT-F) substituents at the β-position of the thiophene vertically conjugated to the NDT core, were designed and synthesized. The photovoltaic effect of engineered NDT molecules was investigated with a detailed characterization of optical absorption, electronic energy levels, blend morphology, carrier mobility and photovoltaic performance. It shows that the hexyl-substitution enhances the morphological tunability for NDT molecules, which contributes to achieving a promising power conversion efficiency (PCE) with high fill factor (FF). The optimized solar cells based on NDT-Hex:PC71BM blends provide a PCE of 6.7% with an FF of 0.717 and it reaches 8.6% with an FF of 0.638 if a non-fullerene molecular acceptor, NBDTP-Fout, is adopted to blend with NDT-Hex. Both FF are among the top values for the respective kinds of solar cells based on an NDT small molecule. The work demonstrates a feasible morphology-tuning method toward efficient organic solar cells with high FF.

Graphical abstract: Efficient NDT small molecule solar cells with high fill factor using pendant group engineering

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Supplementary files

Article information


Submitted
16 Mar 2020
Accepted
27 Apr 2020
First published
27 Apr 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Efficient NDT small molecule solar cells with high fill factor using pendant group engineering

C. Xia, H. Wu, H. Fan, L. Shui and X. Zhu, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01352H

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