期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 33, 页码 11584-11589出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b06322
关键词
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资金
- Swiss NSF via the NCCR:MUST
- European Research Council [H2020 ERCEA 695197 DYNAMOX]
- [206021-157773]
- [407040-154056 (PNR 70)]
Ultrafast interfacial electron transfer in sensitized solar cells has mostly been probed by visible-to-terahertz radiation, which is sensitive to the free carriers in the conduction band of the semiconductor substrate. Here; we demonstrate the use of deep-ultraviolet continuum pulses to probe the interfacial electron transfer, by detecting a specific excitonic transition in both N719-sensitized anatase TiO2 and wurtzite ZnO nanoparticles. Our results are compared to those obtained on bare nanoparticles upon above-gap excitation. We show that the signal upon electron injection from the N719 dye into, TiO2 is dominated by long-range Coulomb screening of the final states of the excitonic transitions, whereas in sensitized ZnO it is dominated by phase-space filling: The present approach offers a possible route to detecting interfacial electron transfer Sf a broad class of systems, including other transition metal oxides or sensitizers.
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