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• W2116988563 abstract "Abstract Device performance and photoinduced charge transfer are studied in donor/acceptor blends of the oxidation‐resistant conjugated polymer poly[(4,8‐bis(2‐hexyldecyl)oxy)benzo[1,2‐b:4,5‐b′]dithiophene)‐2,6‐diyl‐alt‐(2,5‐bis(3‐dodecylthiophen‐2‐yl)benzo[1,2‐d;4,5‐d′]bisthiazole)] (PBTHDDT) with the following fullerene acceptors: [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (PC 71 BM); [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (PC 61 BM); and the indene‐C 60 bis ‐adduct IC 60 BA). Power conversion efficiency improves from 1.52% in IC 60 BA‐based solar cells to 3.75% in PC 71 BM‐based devices. Photoinduced absorption (PIA) of the PBTHDDT:fullerene blends suggests that exciting the donor polymer leads to long‐lived positive polarons on the polymer and negative polarons on the fullerene in all three polymer fullerene blends. Selective excitation of the fullerene in PC 71 BM or PC 61 BM blends also generates long‐lived polarons. In contrast, no discernible PIA features are observed when selectively exciting the fullerene in a PBTHDDT/IC 60 BA blend. A relatively small driving force of ca. 70 meV appears to sustain charge separation via photoinduced hole transfer from photoexcited PC 61 BM to the polymer. The decreased driving force for photoinduced hole transfer in the IC 60 BA blend effectively turns off hole transfer from IC 60 BA excitons to the host polymer, even while electron transfer from the polymer to the IC 60 BA remains active. Suppressed hole transfer from fullerene excitons is a potentially important consideration for materials design and device engineering of organic solar cells." @default.
• W2116988563 created "2016-06-24" @default.
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• W2116988563 date "2012-10-16" @default.
• W2116988563 modified "2023-10-18" @default.
• W2116988563 title "Photoinduced Hole Transfer Becomes Suppressed with Diminished Driving Force in Polymer-Fullerene Solar Cells While Electron Transfer Remains Active" @default.
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• W2116988563 doi "https://doi.org/10.1002/adfm.201201470" @default.
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