Abstract: The present application relates to a photodetector based on interband transition in quantum wells. The photodetector may include a first semiconductor layer having a first conduction type; a second semiconductor layer having a second conduction type different from the first conduction type; and a photon absorption layer arranged between the first semiconductor layer and the second semiconductor layer, the photon absorption layer including at least one quantum well layer and barrier layers arranged on both sides of each quantum well layer. The present application utilizes the modulating effect of a semiconductor PN junction on a photoelectric conversion process associated with quantum wells to significantly increase a current output of the photodetector based on the quantum well material.

Abstract: A method of manufacturing epitaxial material used for GaN based LED with low polarization effect, which includes steps of growing n-type InGaAlN layer composed of GaN buffer layer (2) and n-type GaN layer (3), low polarizing active layer composed of InGaAlN multi-quantum well structure polarized regulating and controlling layer (4) and InGaAlN multi-quantum well structure light emitting layer (5) and p-type InGaAlN layer (6) on sapphire or SiC substrate (1) in turn. The method adds InGaAlN multi-quantum well structure polarized regulating and controlling layer, thus reduces polarization effect of quantum well active region.

Abstract: A method of manufacturing epitaxial material used for GaN based LED with low polarization effect, which includes steps of growing n-type InGaAlN layer composed of GaN buffer layer (2) and n-type GaN layer (3), low polarizing active layer composed of InGaAlN multi-quantum well structure polarized regulating and controlling layer (4) and InGaAlN multi-quantum well structure light emitting layer (5) and p-type InGaAlN layer (6) on sapphire or SiC substrate (1) in turn. The method adds InGaAlN multi-quantum well structure polarized regulating and controlling layer, thus reduces polarization effect of quantum well active region.