Performance investigations of multicolor, broadband quantum dot infrared photodetector

Multiband detectors have many advantages compared with the single band detectors. In this paper a multi color, broad band infrared detector is proposed and analyzed. This multilayer quantum dot infrared detector utilizes the inter-valence band transitions in the InGaAs quantum dots to achieve the multicolor broad band response. Energy eigen values and wave functions of the hole states are determined by the numerical diagonalization of the Luttinger Kohn Hamiltonian. Absorption spectra is calculated by summing over the absorption due to transition from the heavy hole ground state to the all possible states. Then self-consistent numerical calculation method is used to determine the photocurrent and spectral responsivity of multilayer QDIP.