New application of Localization landscape theory on type II SL modeling

Tsung-Yin Tsai, Krystian Michalczewski, Piotr Martyniuk, Chao-Hsin Wu,1 and Yuh-Renn Wu

J. Appl. Phys. 127, 033104 (2020); doi: 10.1063/1.513147

Localization landscape (LL) theory is applied to directly model carrier transport in a type II superlattice (T2SL) InAs/InAsSb photoconductor
system. It is difficult to apply the classical Poisson and drift–diffusion (DD) model to direct modeling of carrier transport in superlattice
systems because quantum effects need to be considered. With the LL theory, it is possible to obtain the effective quantum potential seen
by carriers. By coupling the LL theory with the Poisson–DD model and replacing the traditional conduction and valence potentials with
effective quantum potentials, it is possible to directly model carrier transport in a T2SL system. We compare the results of this approach
with experimental results and find very good agreement, which indicates that this method will provide an efficient tool for the T2SL design.

Comparison of the LL þ Poisson–DD solver and the Poisson–DD solver with a bias of 0.5 V. (a) Comparison of conduction band Ec and its effective quantum potential 1/uc at a cross section x= 47.5 μm along the y direction. (b) Effective quantum potential of the conduction band, 1/uc . (c) Comparison of the valence band Ev and its effective quantum potential 1/uv at a cross section x = 47.5 μm along the y direction. (d) Effective quantum potential of the valence band, 1/uv .