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  Ultrafast electron ejection and trapping in semiconductor colloids after multiple photon absorption.

Kaschke, M., Ernsting, N. P., Muller, U., & Weller, H. (1990). Ultrafast electron ejection and trapping in semiconductor colloids after multiple photon absorption. Chemical Physics Letters, 168(6), 543-550. doi:10.1016/0009-2614(90)85668-3.

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Kaschke, M., Author
Ernsting, N. P.1, Author              
Muller, U., Author
Weller, H., Author
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1Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society, ou_578547              

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 Abstract: Quantum-size semiconductor microcrystallites of ZnCdS and CdS in aqueous and isopropanol solution were optically excited using intense sub-picosecond UV laser pump pulses. Broad-band optical probing monitored the yield of electron emission and the build-up of primary photochemical products. With typical pmp fluences of femtosecond light pulses multiple photons are absorbed by one quantum-dot leading to a quantum yield of up to 0.3 of photogenerated electrons. The yield curves, as a function of pump fluence, are described by a simple kinetic model which involves the trapping-rate constant and a maximum number of electrons which can be emitted per particle. This model is shown to be consistent with thermodynamic considerations.

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Language(s): eng - English
 Dates: 1990-05-18
 Publication Status: Published in print
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 Rev. Type: Peer
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Title: Chemical Physics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 168 (6) Sequence Number: - Start / End Page: 543 - 550 Identifier: ISSN: 0009-2614