Design of narrow bandgap non-fullerene acceptors for photovoltaic applications and investigation of non-geminate recombination dynamics

Autor:	Jaewon Lee, Akchheta Karki, Thuc-Quyen Nguyen, Martin Seifrid, Viktor V. Brus, Seo-Jin Ko, William Le, Michael J. Ford, Joachim Vollbrecht, Guillermo C. Bazan, Kilwon Cho
Rok vydání:	2020
Předmět:	chemistry.chemical_classification Materials science Fullerene Organic solar cell business.industry Band gap Photovoltaic system General Chemistry Polymer Electron acceptor Acceptor chemistry Materials Chemistry Optoelectronics business Recombination
Zdroj:	Journal of Materials Chemistry C. 8:15175-15182
ISSN:	2050-7534 2050-7526
DOI:	10.1039/d0tc02136a
Popis:	A new narrow bandgap non-fullerene electron acceptor was designed, synthesized, and characterized for near-infrared organic photovoltaics. This acceptor was compared to a structurally similar compound with systematically modified side chains, and a series of solar cells were fabricated, employing the common donor polymers PTB7-Th and PBDBT. The devices exhibited charge generation over a wide spectral range and power conversion efficiencies up to 8.1%. The non-geminate recombination dynamics were investigated and quantified via a combination of capacitance spectroscopy and transient open-circuit voltage decay measurements. The reduction of the bandgap results in increased bimolecular recombination losses, while solar cells composed of PBDBT were afflicted by stronger monomolecular, i.e. trap-assisted, recombination losses that ultimately caused the lower power conversion efficiencies of the respective devices. The latter observation could be correlated to less ordered blend film morphology.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c62703f623b9d8a79c4b629d7962cb20 https://doi.org/10.1039/d0tc02136a Zobrazit plný text záznamu