期刊
NANO LETTERS
卷 11, 期 12, 页码 5234-5239出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl202550v
关键词
QD sensitized solar cell; THz spectroscopy; electron transfer; Marcus theory; PbSe QDs
类别
资金
- Toyota Motor Europe NV/SA
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- 3TU Centre for Sustainable Energy Technologies (Federation of the Three Universities of Technology)
We report the direct and unambiguous determination of electron transfer rates and efficiencies from PbSe quantum dots (QDs) to mesoporous SnO2 films. We monitor the time-dependent electron density within the oxide with picosecond time resolution using Terahertz spectroscopy, following optical excitation of the QDs using a femtosecond laser pulse. QD-oxide electron transfer occurs with efficiencies of similar to 2% in our samples under 800 nm pumping with a marked dependence on QD size, ranging from similar to 100 ps injection times for the smallest, similar to 2 nm diameter QDs, to similar to 1 ns time scale for similar to 7 nm QDs. The size-dependent electron transfer rates are modeled within the framework of Marcus theory and the implications of the results for device design are discussed.
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