PERFORMANCE OF MBE GROWN CDTE PHOTOCONDUCTOR ARRAYS FOR HARD X-RAY-DETECTION

Photoconductor linear array detectors for hard X-ray photon detection were fabricated using Molecular Beam Epitaxially (MBE) grown (111)B Cd Te on (100) Si substrates. The ohmic contact to the CdTe was excellent and provided a linear response to the X-ray photons. The response cur rent was linearly increased in a 7-19 keV energy range. The stability of the detectors was very satisfactory and they were tested over an ex tended period of time without noticeable degradation. The excellent re sponse uniformity of a 64 linear array was obtained. The performance o f the photoconductor was greatly improved when the detector was cooled . At 230 K, the dynamic range of the detector response increased to ne arly four decades.