摘要
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57Co122keV光谱能量分辨率为23.7%(28.9keVFWHM),137Cs662keV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.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2008年第6期751-753,共3页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60676033)
