https://scholars.lib.ntu.edu.tw/handle/123456789/415806
Title: | New D-A-A-Configured Small-Molecule Donors for High-Efficiency Vacuum-Processed Organic Photovoltaics under Ambient Light | Authors: | Chen, C.-H. Ting, H.-C. Li, Y.-Z. Lo, Y.-C. Sher, P.-H. Wang, J.-K. Chiu, T.-L. Lin, C.-F. Hsu, I.-S. Lee, J.-H. Liu, S.-W. JIUN-HAW LEE Wang, J.-K. |
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. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062374953&doi=10.1021%2facsami.8b20415&partnerID=40&md5=4cce90761000688cfefe91acfdc1bdee https://scholars.lib.ntu.edu.tw/handle/123456789/415806 |
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 [SDGs]SDG7 |
Appears in Collections: | 化學系 |
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