Magneto-Hall Characterization of Delta-Doped Pseudomorphic High-Electron-Mobility Transistor Structures

Authors

David C. Look, Wright State University - Main CampusFollow
B. Jogai
C. E. Stutz
R. E. SherriffFollow
G. C. DesalvoFollow
T. J. RogersFollow
J. M. Ballingall

Document Type

Article

Publication Date

7-1-1994

Abstract

Conventional Hall‐effect determination of the two‐dimensional electron gas (2DEG) concentration n_2D in pseudomorphic high electron mobility transistor structures is invalid because of interference from the highly doped GaAs cap. Furthermore, the usual methods of dealing with this cap‐interference problem, namely, (1) etching off the cap totally, (2) etching the cap until the mobility reaches a maximum, or (3) growing a separate structure with a thin, depleted cap, in general, give n_2D values that are too low. However, we show here that magnetic‐field‐dependent Hall (M‐Hall) measurements can separately determine the carrier concentrations and mobilities in the cap and 2DEG regions, as verified by comparison with a self‐consistent, four‐band, k⋅p calculation and also by electrochemical capacitance‐voltage measurements in structures with different cap and spacer thicknesses.

Comments

Copyright © 1994, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in the Journal of Applied Physics 76.1, and may be found at http://jap.aip.org/resource/1/japiau/v76/i1/p328_s1

Repository Citation

Look, D. C., Jogai, B., Stutz, C. E., Sherriff, R. E., Desalvo, G. C., Rogers, T. J., & Ballingall, J. M. (1994). Magneto-Hall Characterization of Delta-Doped Pseudomorphic High-Electron-Mobility Transistor Structures. Journal of Applied Physics, 76 (1), 328-331.
https://corescholar.libraries.wright.edu/physics/126

DOI

10.1063/1.357148