报道了一种基于N型Cd0.9Zn0.1Te晶体材料的室温核辐射探测器。为充分发挥CdZnTe材料的优点,实验中采用了一系列工艺优化措施:如对材料表面进行处理,采用Pt/Au双层电极结构并优化器件表面钝化方法,改善退火条件等,从而制备出性能优良的7mm×7mm×5mm阵列像素(3×3)探测器:其^57Co 122 keV光谱能量分辨率为23.7%(28.9keV FWHM),^137Cs 662 keV光谱分辨率为17.9%(17.8keV FWHM);光谱曲线理想,呈高斯分布形状;低能带尾非常陡峭,这说明空穴的影响较小,可以忽略。此外,该探测器在室温及不同测试条件下均能稳定工作,与传统探测器相比,省去了复杂昂贵的低温制冷系统,降低了成本。
Cadmium zinc telluride(CZT)is one of the preferred material for the fabrication of X-ray and gamma-ray detector. Because of the relatively high atomic number,high density and wide band-gap,CZT detector can achieve sharp energy resolution and high detection efficiency without cryogenic cooling. A CZT detector has been fabricated and the gamma-ray spectra of Co and Cs were obtained. At room temperature,the energy resolution of the detector is 23.7(28. 9 keV FWHM) for 122 keV ^57 Co and 17. 9%(117.8 keV FWHM) for 662 keV,^137 Cs,respectively. The spectrum is gauss distributing,and low energy band tail is sharp,which shows that the effect of hole is weak,while no polarization is observed and stability is verysatisfactory.