|Title:||New D-A-A-Configured Small-Molecule Donors for High-Efficiency Vacuum-Processed Organic Photovoltaics under Ambient Light||Authors:||Chen, C.-H.
|Issue Date:||2019||Journal Volume:||11||Journal Issue:||8||Start page/Pages:||8337-8349||Source:||ACS Applied Materials and Interfaces||Abstract:||
Four new donor-acceptor-acceptor (D-A-A) type molecules (DTCPB, DTCTB, DTCPBO, and DTCTBO), wherein benzothiadiazole or benzoxadiazole serves as the central A bridging triarylamine (D) and cyano group (terminal A), have been synthesized and characterized. The intramolecular charge-transfer character renders these molecules with strong visible light absorption and forms antiparallel dimeric crystal packing with evident Ï-Ïintermolecular interactions. The characteristics of the vacuum-processed photovoltaic device with a bulk heterojunction active layer employing these molecules as electronic donors combining C 70 as electronic acceptor were examined and a clear structure-property-performance relationship was concluded. Among them, the DTCPB-based device delivers the best power conversion efficiency (PCE) up to 6.55% under AM 1.5 G irradiation. The study of PCE dependence on the light intensity indicates the DTCPB-based device exhibits superior exciton dissociation and less propensity of geminated recombination, which was further verified by a steady photoluminescence study. The DTCPB-based device was further optimized to give an improved PCE up to 6.96% with relatively high stability under AM 1.5 G continuous light-soaking for 150 h. This device can also perform a PCE close to 16% under a TLD-840 fluorescent lamp (800 lux), indicating its promising prospect for indoor photovoltaic application. © 2019 American Chemical Society.
|DOI:||10.1021/acsami.8b20415||SDG/Keyword:||Charge transfer; Efficiency; Heterojunctions; Light absorption; Molecules; Synthesis (chemical); Ambient light; Device stability; Organic photovoltaics; Small molecules; Vacuum process; DAA configuration; Light
|Appears in Collections:||化學系|
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