JPH0456476B

The electromagnetic radiation sensitive detector comprises a substrate (10), a first layer (12) on the substrate of radiation sensitive semiconductor material of a given conductivity type and having a first energy bandgap, at least one ohmic contact (16) providing electrical communication with the first layer, and a second layer (14) of semiconductor material of the same conductivity type as the first layer but having an energy bandgap greater than that of the first layer, the second layer being located on the first layer (12) beneath the or each contact (16) to which minority carriers are attracted from the first layer to enhance the responsivity of the detector.