Non-equilibrium distribution of hot carriers in a CdSe thin film

Fumio Sasaki, Tomobumi Mishina, Yasuaki Masumoto, Brian Fluegel, Kenith Meissner, Nasser N Peyghambarian

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Femtosecond pump-and-probe spectroscopy was adopted to study the hot carrier distribution in a CdSe thin film. In the experiment, a non-thermalized hot carrier distribution was observed when the pump was turned on. The non-thermalized distribution was observed at the 200 meV broad energy range extending from the pump energy to the low energy side. The low energy tail of the non-thermalized distribution indicates that the carrier-LO phonon scattering competes with the carrier-carrier scattering in the thermalization process. In this sense, this observation is a unique example of the non-thermalized hot carrier distribution in semiconductors. From the ratio of the non-thermalized distribution to the total one, the thermalization time was estimated to be 16-40 fs. In the wake of the thermalization, cooling of photogenerated carriers was observed. With an increase of the excitation density up to 1019 cm-3, the carrier cooling rate was slower. The observed cooling rate was slower than the theoretical calculation, taking account of the screening of the carrier-phonon interaction. This is ascribed to the hot phonon effects of the LO phonon and the TO phonon.

Original languageEnglish (US)
JournalSemiconductor Science and Technology
Volume7
Issue number3 B
StatePublished - Mar 1992
Externally publishedYes

Fingerprint

Hot carriers
Pumps
Cooling
Thin films
thin films
Phonon scattering
Screening
Spectroscopy
Scattering
pumps
Semiconductor materials
cooling
energy
Experiments
scattering
wakes
screening
probes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Sasaki, F., Mishina, T., Masumoto, Y., Fluegel, B., Meissner, K., & Peyghambarian, N. N. (1992). Non-equilibrium distribution of hot carriers in a CdSe thin film. Semiconductor Science and Technology, 7(3 B).

Non-equilibrium distribution of hot carriers in a CdSe thin film. / Sasaki, Fumio; Mishina, Tomobumi; Masumoto, Yasuaki; Fluegel, Brian; Meissner, Kenith; Peyghambarian, Nasser N.

In: Semiconductor Science and Technology, Vol. 7, No. 3 B, 03.1992.

Research output: Contribution to journalArticle

Sasaki, F, Mishina, T, Masumoto, Y, Fluegel, B, Meissner, K & Peyghambarian, NN 1992, 'Non-equilibrium distribution of hot carriers in a CdSe thin film', Semiconductor Science and Technology, vol. 7, no. 3 B.
Sasaki, Fumio ; Mishina, Tomobumi ; Masumoto, Yasuaki ; Fluegel, Brian ; Meissner, Kenith ; Peyghambarian, Nasser N. / Non-equilibrium distribution of hot carriers in a CdSe thin film. In: Semiconductor Science and Technology. 1992 ; Vol. 7, No. 3 B.
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N2 - Femtosecond pump-and-probe spectroscopy was adopted to study the hot carrier distribution in a CdSe thin film. In the experiment, a non-thermalized hot carrier distribution was observed when the pump was turned on. The non-thermalized distribution was observed at the 200 meV broad energy range extending from the pump energy to the low energy side. The low energy tail of the non-thermalized distribution indicates that the carrier-LO phonon scattering competes with the carrier-carrier scattering in the thermalization process. In this sense, this observation is a unique example of the non-thermalized hot carrier distribution in semiconductors. From the ratio of the non-thermalized distribution to the total one, the thermalization time was estimated to be 16-40 fs. In the wake of the thermalization, cooling of photogenerated carriers was observed. With an increase of the excitation density up to 1019 cm-3, the carrier cooling rate was slower. The observed cooling rate was slower than the theoretical calculation, taking account of the screening of the carrier-phonon interaction. This is ascribed to the hot phonon effects of the LO phonon and the TO phonon.

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