Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 43, Pages 15175-15182Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc02136a
Keywords
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Funding
- Alexander-von-Humboldt Stiftung
- Office of Naval Research (ONR) [N000141410076]
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science and ICT, Korea [2011-0031628]
- DOE Office of Science [DE-AC02-05CH11231]
- National Research Foundation of Korea [21A20151513147] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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