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Scattering induced by Al segregation in AlGaN/GaN heterostructures

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4928932· OSTI ID:22489111
;  [1];  [2]
  1. Department of Physics, Beijing Jiaotong University, Beijing 100044 (China)
  2. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85281 (United States)
The effect of Al segregation near dislocations on the mobility of two-dimensional electron gas in AlGaN/GaN heterostructure-based high-electron-mobility transistors was investigated. Exponentially varied composition fluctuation was effective in describing Al segregation near dislocations when calculating scattering behavior. Mobility, which was limited by Al segregation surrounding dislocation lines, was calculated to be in the order of 10{sup 3} cm{sup 2}/Vs to 10{sup 6} cm{sup 2}/Vs. Results indicated that the mobility in AlGaN/GaN heterojunction was enhanced upon the reduction of dislocation density at low temperature. This study contributes to generating higher electron mobility in AlGaN/GaN heterojunctions.
OSTI ID:
22489111
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 107; ISSN APPLAB; ISSN 0003-6951
Country of Publication:
United States
Language:
English