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Size-Dependent Electron Transfer from PbSe Quantum Dots to SnO2 Monitored by Picosecond Terahertz Spectroscopy

التفاصيل البيبلوغرافية
العنوان: Size-Dependent Electron Transfer from PbSe Quantum Dots to SnO2 Monitored by Picosecond Terahertz Spectroscopy
المؤلفون: Laurens D. A. Siebbeles, Puck M. Moll, Yunan Gao, Enrique Cánovas, Mischa Bonn, Arjan J. Houtepen, Sachin Kinge, Soren A. Jensen
المصدر: Nano Letters. 11:5234-5239
بيانات النشر: American Chemical Society (ACS), 2011.
سنة النشر: 2011
مصطلحات موضوعية: Electron density, business.industry, Chemistry, Mechanical Engineering, Bioengineering, General Chemistry, Condensed Matter Physics, Laser, Terahertz spectroscopy and technology, law.invention, Marcus theory, Electron transfer, Quantum dot, law, Picosecond, Femtosecond, Optoelectronics, General Materials Science, business
الوصف: 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 ∼2% in our samples under 800 nm pumping with a marked dependence on QD size, ranging from ∼100 ps injection times for the smallest, ∼2 nm diameter QDs, to ∼1 ns time scale for ∼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.
تدمد: 1530-6992
1530-6984
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28ed36e4728209c7b1593e5bf0a41027
https://doi.org/10.1021/nl202550v
رقم الأكسشن: edsair.doi.dedup.....28ed36e4728209c7b1593e5bf0a41027
قاعدة البيانات: OpenAIRE
الوصف
تدمد:15306992
15306984