New photovoltaic gamma and X-ray detector

Detectors based on epitaxial gallium arsenide grown from the gas phase are investigated. Two types of structures are studied: 1) with a not doped active layer (n ≤ 10¹³cm^-3), 2) with the active layer compensated by chromium. It is shown that both types of structures operates in photovaultarical mode that allows to remove the drain current. Structures may be used as detectors of gamma radiation. Detectors have 100% efficiency of charge collection.