Positive and negative temperature dependences of electron-impact ionization in In[sub 0.53]Ga[sub 0.47]As

Choo, K. Y. and Ong, D. S. (2005) Positive and negative temperature dependences of electron-impact ionization in In[sub 0.53]Ga[sub 0.47]As. Journal of Applied Physics, 98 (2). 023714. ISSN 00218979

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Official URL: http://dx.doi.org/10.1063/1.1993755

Abstract

The electron-impact ionization coefficient (α) in In0.53Ga0.47As increases with temperature at electric fields below 200 kV/cm, in contrast to most crystalline semiconductors. It exhibits conventional negative temperature dependence at higher fields. A four-valley analytical band Monte Carlo model is used to study this anomalous behavior. The simulations show that both alloy scattering and the temperature dependence of the impact ionization threshold energy contribute to the temperature dependence of α. At low fields, we find that most ionization events occur in the first conduction band causing an increase of α with temperature in In0.53Ga0.47As. At high fields, α decreases with temperature again because of the reduced hot-electron population in the second conduction band.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 04 Sep 2013 07:20
Last Modified: 04 Sep 2013 07:20
URI: http://shdl.mmu.edu.my/id/eprint/3930

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