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Journal Article

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

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Ernsting,  N. P.
Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-0DC9-3
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.