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Issue 11, 2019
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Solubilizing core modifications on high-performing benzodithiophene-based molecular semiconductors and their influences on film nanostructure and photovoltaic performance

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Abstract

Sidechain engineering of the benzodithiophene-based high-performance organic solar cell (OSC) material BTR generated four novel p-type small-molecule semiconducting materials to investigate structure–property relationships in p-type organic semiconductors. Through depth-dependent grazing incidence wide-angle X-ray scattering (GIWAXS) studies, it is found that our best performing materials possess an active-layer morphology comprised of a vertically graded structure with different crystallite orientations. We further establish a correlation between a high solubility in the spin-coating deposition solution and the occurrence of this vertical distribution, whereas materials with lower solubility are found to possess a predominantly edge-on molecular orientation. These results further the understanding of this high-performing class of materials and suggest the importance of solubility considerations to OSC morphology.

Graphical abstract: Solubilizing core modifications on high-performing benzodithiophene-based molecular semiconductors and their influences on film nanostructure and photovoltaic performance

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Article information


Submitted
06 Jan 2019
Accepted
21 Feb 2019
First published
21 Feb 2019

J. Mater. Chem. A, 2019,7, 6312-6326
Article type
Paper

Solubilizing core modifications on high-performing benzodithiophene-based molecular semiconductors and their influences on film nanostructure and photovoltaic performance

C. J. Lee, V. D. Mitchell, J. White, X. Jiao, C. R. McNeill, J. Subbiah and D. J. Jones, J. Mater. Chem. A, 2019, 7, 6312
DOI: 10.1039/C9TA00168A

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