研究目的
To provide a one-dimensional numerical simulation of multiple quantum wells devices using a simple, flexible, and highly efficient simulator called MQWSS for modeling and designing structures like quantum well infrared photodetectors and quantum cascade lasers.
研究成果
The MQWSS simulator provides a flexible and efficient tool for designing multiple quantum well structures with reasonable accuracy, comparable to more complex simulations, but is limited by the neglect of nonparabolicity and other quantum effects for higher energy states.
研究不足
The simulator uses a single-band effective mass approximation, ignoring nonparabolicity effects, which limits accuracy for higher energy states. It does not include self-consistent Schr?dinger-Poisson calculations and assumes a linear potential drop for band bending.
1：Experimental Design and Method Selection:
The simulator is based on the effective mass approximation to solve the Schr?dinger equation using box integration finite differences and transfer matrix methods for bound and scattering states. It includes a graphical user interface for parameter variation.
2：Sample Selection and Data Sources:
Simulation examples include three coupled quantum wells, an asymmetric quantum well infrared photodetector, and a quantum cascade laser design, with parameters derived from literature.
3：List of Experimental Equipment and Materials:
No physical equipment is used; it is a software simulator. Materials modeled include AlGaAs/GaAs, InGaAs/InP, and GaAs/AlGaAs heterostructures.
4：Experimental Procedures and Operational Workflow:
Users input design parameters via the GUI, and the simulator calculates energy levels, wave functions, and absorption coefficients in real-time.
5：Data Analysis Methods:
Eigenvalue problems are solved using computer algorithms for tridiagonal matrices; absorption is calculated using Fermi's Golden rule with Lorentzian lineshape.
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