Carrier Relaxation in Self-Assembled ZnTe/ZnSe Quantum Dots

ORAL

Abstract

Carrier relaxation in the type II self-assembled ZnTe/ZnSe quantum dots have been studied using ultrafast photoluminescence upconversion technique. We found that PL exhibits fast decay for ZnTe/ZnSe QDs grown in Volmer-Weber mode than that in Stranski-Krastanow mode. The dependence of PL decay time on energy was found only for QDs grown in Stranski-Krastanow mode. We attribute the different behaviors of PL decay for these two modes to the wetting layers.

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Authors

  • Der-Jun Jang

  • Y. C. Yeh

  • S.K. Lu

  • C.L. Wu

    • Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C

  • C.-S. Yang

  • W.C. Chou

    • Department of Electrophysics, National Chiao-Tung University, Hsinchu, 30056 Taiwan, R.O.C.

  • M.E Lee

    • Department of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.