標題: Temperature-dependent transport properties of n(+) GaAs/low-temperature GaAs/n(+) GaAs structures grown by molecular beam epitaxy
作者: Chen, JF
Chen, NC
Chiu, SY
Wang, PY
Lee, WI
Chin, A
電子物理學系
Department of Electrophysics
公開日期: 1-Jun-1996
摘要: The temperature-dependent I-V characteristics of n(+) GaAs low-temperature GaAs(AlGaAs) n(+) GaAs structures in which the low-temperature layers were grown at 250, 350, and 450 degrees C were analyzed. Band conduction with an activation energy of 0.72 eV dominates at T>250 K. Hopping conduction dominates at T<250 K, where the resistivity was found to be insensitive to temperature. From this analysis, it is shown that Fermi level is pinned to an acceptorlike deep level of about 10(17) cm(-3), which lies at 0.72 eV below the conduction band. Measured capacitance can be described in terms of a parallel-plate capacitance with separation being equal to the expected growth thickness. Majority traps (electrons) were observed by deep-level transient spectroscopy with an activation energy about 0.72 eV, confirming the result of the resistivity analysis. In addition, the I-V characteristics were fitted to the simulated curves based on a simplified space-charge limited theory and the result was found to be consistent with the resistivity analysis. (C) 1996 American Institute of Physics.
URI: http://hdl.handle.net/11536/1266
ISSN: 0021-8979
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 79
Issue: 11
起始頁: 8488
結束頁: 8492
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