Ultrafast Recombination Dynamics in Dye-Sensitized SnO2/TiO2 Core/Shell Films
Ultrafast Recombination Dynamics in Dye-Sensitized SnO2/TiO2 Core/Shell Films
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DOI：
10.1021/acs.jpclett.6b02388
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发表时间：
2016-12-15
影响因子：
5.7
通讯作者：
Papanikolas, John M.
中科院分区：
文献类型：
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作者：
Gish, Melissa K.;Lapides, Alexander M.;Papanikolas, John M.
用瞬态吸收法研究了Ru（II）-聚吡啶生色团（[Ru-II（bpy）（2）（4，4 '-（PO 3 H2）（2）bPY）（2+），RuP）衍生的SnO 2/TiO 2核壳膜的界面动力学.从生色团到二氧化钛壳层的电子注入发生在光激发后的几皮秒内。氧化染料通过重组的损失发生在跨越10个数量级的时间尺度上。大多数（60%）电荷复合事件发生在注入后不久（τ = 220 ps），而一小部分（
Interfacial dynamics are investigated in SnO2/TiO2 core/shell films derivatized with a Ru(II)-polypyridyl chromophore ([Ru-II(bpy)(2)(4,4'-(PO3H2)(2)bPY)(2+), RuP) using transient absorption methods. Electron injection from the chromophore into the TiO2 shell occurs within a few picoseconds after photoexcitation. Loss of the oxidized dye through recombination occurs across time scales spanning 10 orders of magnitude. The majority (60%) of charge recombination events occur shortly after injection (tau = 220 ps), while a small fraction (