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Electron Injection, Recombination, and Halide Oxidation Dynamics at Dye-Sensitized Metal Oxide Interfaces

机译:染料敏化金属氧化物界面上的电子注入,复合和卤化物氧化动力学

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摘要

Time-resolved infrared measurements indicate ultrafast, <350 fs, electron injection from (4, 4'dcb)_2Ru(NCS)_2 (1) and (5, 5'dcb)_2Ru(NCS)_2 (2) to nanostructured TiO_2 electrodes (where 4, 4'dcb = 4, 4'-(COOH)_2-2, 2'-bipyridine). Although rapid, the injection from 2 apparently occurs with a lower quantum yield than that from 1, explaining a lower overall photon-to-current efficiency for 2/TiO_2 solar cells. Transient visible spectroscopy reveals similar rates of both halide oxidation and injected electron-oxidized dye recombination for the two sensitizers. Substituting SnO_2 for TiO_2 increases the electron injection yield from 2 in the case of transparent metal oxide films and improves the photon-to-current efficiency. Results indicate a wavelength-dependent electron injection yield.
机译:时间分辨的红外测量表明<350 fs超快,从(4,4'dcb)_2Ru(NCS)_2(1)和(5,5'dcb)_2Ru(NCS)_2(2)向纳米结构TiO_2电极注入电子(其中4,4'dcb = 4,4'-(COOH)_2-2,2'-联吡啶)。尽管快速,但是从2注入的量子产率显然比从1注入的量子产率低,这说明了2 / TiO_2太阳能电池的总体光子-电流效率较低。瞬态可见光谱揭示了两种敏化剂的卤化物氧化和注入的电子氧化染料复合的相似速率。在透明金属氧化物膜的情况下,用SnO_2代替TiO_2可使电子注入产率从2提高,并提高了光子电流效率。结果表明与波长有关的电子注入产率。

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