Computation of Absorption Coefficient for Pöschl–Teller Potential in Double Quantum Well Structure for Photodetector Applications

Absorption coefficient due to lowest quantum state of double-well-triple-barrier structure is analytically investigated for Poschl–Teller potential configuration. Kane-type conduction band nonparabolicity of first order is considered for evaluation of eigenstates for realistic computation, and Lorentzian lineshape is taken into account. Tuning parameters of the Poschl–Teller geometry is varied along with structural parameters and results are compared with earlier obtained rectangular, parabolic and Gaussian potentials. Corresponding blueshift/redshift is obtained for each specific case, and effect of applied field along the direction of quantum confinement is analyzed compared with the situation when field is absent. Comparative study speaks in favor of the present structure both in terms of higher value of absorption as well as lower linewidth spectrum (wavelength scale). Result speaks in favor of the configuration compared to the idealized potential well for photodetector and sensor applications.