https://scholars.lib.ntu.edu.tw/handle/123456789/502506
Title: | Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics | Authors: | Sahu, Duryodhan Tsai, Chia-Hua Wei, Hung-Yu Ho, Kuo-Chuan Chang, Feng-Chih KUO-CHUAN HO HUNG-YU WEI |
Issue Date: | 2012 | Journal Volume: | 22 | Journal Issue: | 16 | Start page/Pages: | 7945-7953 | Source: | Journal of Materials Chemistry | Abstract: | 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 (PC 61BM) or [6,6]-phenyl-C 71-butyric acid methyl ester (PC 71BM) at various weight ratios. The photovoltaic device containing the donor TPAKP-3 and the acceptor PC 71BM at 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%. © 2012 The Royal Society of Chemistry. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/502506 | ISSN: | 0959-9428 | DOI: | 10.1039/c2jm16760c | SDG/Keyword: | Active Layer; Bulk heterojunction; Diketopyrrolopyrroles; Electron acceptor; Electron donors; Fill factor; Low bandgap; Methyl esters; Organic photovoltaics; Photophysical properties; Photovoltaic devices; Power conversion efficiencies; Small molecules; Starbursts; Synthetic routes; Triphenylamines; Weight ratios; White light; Butyric acid; Conversion efficiency; Electrons; Esterification; Esters; Heterojunctions; Molecules; Open circuit voltage; Photovoltaic effects; Thiophene; Synthesis (chemical) |
Appears in Collections: | 電機工程學系 |
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