Nitrogen-Activated Bowing of Dilute In yGa1-yAs1- xNx Based on Photoreflectance Studies

Published

December 1, 2003

Author(s)

M M. Fahmi, A Kahn, J A. Griffin, G L. Harris, Larry Robins, Anthony G. Birdwell, Youn S. Kang, D J. Smith, T Steiner, S N. Mohammad

Abstract

The dependence of the fundamental band gap and higher-lying critical-point energies of dilute-nitrogen Ga_1-yIn_yAs_1-xN_x epilayers on nitrogen mole fraction (x), for x less than or equal to} 0.0125, and temperature, from 20 K to 295 K, was investigated by photoreflectance spectroscopy. The band gap, E_G, was found to decrease with increasing x in a highly nonlinear manner. The bowing parameter (the second-order parameter b in a quadratic expression for the dependence of E_G on x) was found to become less negative with increasing x; the value of b changed from -50 eV, at very low nitrogen fraction, to -20 eV, at x > 0.01. These results strongly suggest that nitrogen-related impurity levels arise within the band gap of dilute-nitrogen Ga_1-yIn_yAs_1-xN_x alloys.

Citation

Journal of Applied Physics

Volume

94

Issue

No. 12

Pub Type

Journals

Keywords

critical-point energies, dilute-nitrogen GA(1-y)In(y)As(1-x)N(x), nitrogen-activated bowing, photoreflectance

Citation

Fahmi, M. , Kahn, A. , Griffin, J. , Harris, G. , Robins, L. , Birdwell, A. , Kang, Y. , Smith, D. , Steiner, T. and Mohammad, S. (2003), Nitrogen-Activated Bowing of Dilute In _yGa_1-yAs_{1- x}N_x Based on Photoreflectance Studies, Journal of Applied Physics (Accessed April 18, 2024)