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• W2181953987 abstract "The selective extraction of hot electrons to suitable energy contacts is a key aspect towards the development of hot carrier solar cells. Here we employ Time Resolved THz Spectroscopy (TRTS) to evaluate the extent to which hot electron transfer (HET) takes place from the 1Pe states of colloidal 3 nm PbSe quantum dots molecularly linked by 3-mercaptopropionic acid to mesoporous SnO2 and TiO2 sensitized films. For PbSe–3MPA–SnO2 samples, we show that the efficiency of hot electron transfer is negligibly small at room temperature, i.e. within the ∼10% detection limit of our measurements. The impact of spurious signals on TRTS data arising from carrier dynamics regarding QDs aggregates – which can be misinterpreted as HET – is discussed in detail. In contrast, in line with previous reports, hot electron transfer is observed to take place from the Pe states of colloidal PbSe QDs in the PbSe–3MPA–TiO2 system, with an efficiency ⩾80%. These results are rationalized in terms of a stronger donor–acceptor coupling between QD and oxide for the TiO2 electrode when compared with a SnO2 electrode, a factor that ultimately defines the kinetic competition between electron transfer rate towards the oxide and intraband cooling within the QDs." @default.
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• W2181953987 date "2016-06-01" @default.
• W2181953987 modified "2023-09-25" @default.
• W2181953987 title "Hot electron transfer from PbSe quantum dots molecularly bridged to mesoporous tin and titanium oxide films" @default.
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• W2181953987 doi "https://doi.org/10.1016/j.chemphys.2015.11.005" @default.
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