Capabilities of CdTe-Based Detectors With ${\mathrm {MoO}}_{x}$ Contacts for Detection of X- and $\gamma$ -Radiation

Abstract

The charge transport mechanism and spectrometric properties of the X-ray and $\gamma $ -ray detectors, fabricated by the deposition of molybdenum oxide thin films onto semi-insulating p-CdTe crystals were studied. The current transport processes in the ${\mathrm {Mo}}{-}{\mathrm {MoO}}_{x}/{\mathrm {p}}{-}{\mathrm {CdTe/MoO}}_{x}{-}{\mathrm {Mo}}$ structure are well described in the scope of the carrier’s generation in the space-charge region and the space-charge-limited current models. The lifetime of charge carriers, the energy of hole traps, and the density of discrete trapping centers were determined from the comparison of the experimental data and calculations. Spectrometric properties of ${\mathrm {Mo}}{-}{\mathrm {MoO}}_{x}/{\mathrm {p}}{-}{\mathrm {CdTe/MoO}}_{x}{-}{\mathrm {Mo}}$ structures were also investigated. It is shown that the investigated heterojunctions have demonstrated promising characteristics for practical application in X-ray and $\gamma $ -ray detector fabrication.