Low-bandgap push–pull molecules in polymer matrices for use in thin-film organic photovoltaic devices

Autor:	Thierry Maris, Marc-André Dubois, Alice Heskia, Daniel Beaudoin, Pierre-Louis M. Brunner, James D. Wuest
Rok vydání:	2020
Předmět:	chemistry.chemical_classification Chemistry Band gap Organic Chemistry Photovoltaic system Nanotechnology General Chemistry Electron Polymer Thin film Conjugated system Catalysis Push pull molecules
Zdroj:	Canadian Journal of Chemistry. 98:564-574
ISSN:	1480-3291 0008-4042
DOI:	10.1139/cjc-2020-0081
Popis:	Conjugated polymers are widely used in thin-film organic photovoltaic devices to absorb light and serve as electron donors or acceptors. Small molecular analogues are attractive substitutes because they have fully defined structures, can be purified rigorously, and are typically more soluble and volatile. However, producing active films composed primarily of small molecules remains challenging. We have devised bulk heterojunction solar cells in which poly(3-hexylthiophene-2,5-diyl) and poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] are used as matrices to prepare films containing low-bandgap push–pull molecules as electron donors and (6,6)-phenyl-C61-butyric acid methyl ester or (6,6)-phenyl-C71-butyric acid methyl ester as electron acceptors. Compared with reference devices devoid of push–pull molecular additives, increases in power conversion efficiencies up to 30.4% were measured.
Databáze:	OpenAIRE
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