COMPARATIVE ANALYSIS OF ABSORPTION COEFFICIENT FOR PARABOLIC AND GAUSSIAN QUANTUM WELLS FOR PHOTODETECTOR APPLICATION

Abstract

The Absorption coefficient of double Gaussian and parabolic quantum wells are analytically computed as a function of wavelength for different structural parameters and material composition. Lorentzian lineshape function is considered for near accurate estimation, and intersubband transitions between lowest three quantum states are considered for calculation. The transition between ground and first quantum state is primarily considered for the analysis, and Kane-type first order band nonparabolicity is taken into account. Electric field is applied along the direction of quantum confinement. Result plays important role for design of the device for photodetector application.