Studies On Growth Technics Of CdSe Single Crystals And Performance Of Room Temperature Nuclear Radiation Detectors

Cadmium Selenide (CdSe) single crystal is regarded as one of the most promising materials for room temperature nuclear radiation detectors, but the further studies and application of this nuclear radiation detector are restricted because of the difficulties on producing high quality CdSe single crystals and no suitable technology for processing this devices.In this paper, the thermodynamics and dynamics of CdSe crystal vapor phase growth are analyzed, and parts of dynamic parameters in crystal growth are calculated. Based on the researches of the thermodynamics and dynamics of CdSe crystal vapor phase growth, we introduced modified two-zone furnace vapor phase pulling method to grow high quality single crystals with good integrity, higher electrical resistivity and a size of Φ014 ×40mm for isometric diameter section. Concerning on all about heat treatment of wafers, surface process and contact electrodes, we did researches to improve room temperature nuclear radiation detectors' performances. Detectors with high energy resolution achieving 10% (for 241Am 59.5KeV) and good working stability were made and we have obtained some satisfying research results.To do researches on thermodynamics of CdSe vapor phase crystal growth in isolated systems, differences of compositions in vapor phase under different system pressures were calculated. Results showed that with higher system pressure, the proportion of decompounded compositions in vapor phase was smaller and then...