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

Calvin J. Lee, Valerie D. Mitchell, Jonathan White, Xuechen Jiao, Christopher R. McNeill, Jegadesan Subbiah, David J. Jones

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6312-6326
Number of pages15
JournalJournal of Materials Chemistry A
Volume7
Issue number11
DOIs
Publication statusPublished - 1 Jan 2019

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