標題: Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics
作者: Sahu, Duryodhan
Tsai, Chia-Hua
Wei, Hung-Yu
Ho, Kuo-Chuan
Chang, Feng-Chih
Chu, Chih-Wei
應用化學系
光電工程學系
Department of Applied Chemistry
Department of Photonics
公開日期: 2012
摘要: In this study, we used facile synthetic routes to construct two well-defined starburst donor/acceptor conjugated small molecules with broad absorption features; in TPAKP-2 and TPAKP-3, triphenylamine (TPA) moieties served as electron donor core units and dialkylated diketopyrrolopyrrole (DKP) moieties with symmetrical thiophene units served as electron acceptors, in 1 : 2 and 1 : 3 ratios, respectively. Our investigation of the photophysical properties indicated that the absorption bands of TPAKP-2, and TPAKP-3 extended up to 793 nm, with low optical band gaps of 1.56 and 1.65 eV respectively. Under illumination with AM 1.5 white light (100 mW cm(-2)), we investigated the performance of bulk heterojunction (BHJ) photovoltaic devices incorporating an active layer of an electron-donor small molecule (TPAKP-2 or TPAKP-3) blended with an electron acceptor: [6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) at various weight ratios. The photovoltaic device containing the donor TPAKP-3 and the acceptor PC(71)BMat a 1 : 3 weight ratio exhibited the best power conversion efficiency (1.81%), with an open circuit voltage of 0.66 V, a short circuit current density of 7.93 mA cm(-2), and a fill factor of 34.7%.
URI: http://hdl.handle.net/11536/15860
http://dx.doi.org/10.1039/c2jm16760c
ISSN: 0959-9428
DOI: 10.1039/c2jm16760c
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 22
Issue: 16
起始頁: 7945
結束頁: 7953
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