钝化
碲锌镉
材料科学
蚀刻(微加工)
研磨
图层(电子)
光电子学
抛光
各向同性腐蚀
探测器
纳米技术
光学
复合材料
物理
作者
Beomjun Park,Y. Kim,J. Seo,Joo-Yun Byun,K. Kim
标识
DOI:10.1016/j.net.2022.06.005
摘要
Several cadmium zinc telluride (CZT) crystals were fabricated into radiation detectors using methods that included slicing, dicing, lapping, polishing, and chemical etching. A wet passivation with sodium hypochlorite (NaOCl) was then carried out on the Br-etched detectors. The Te-rich layer on the CZT surface was successfully compensated to the Te oxide layer, which was analyzed with X-ray photoelectron spectroscopy data of both a Br-etched crystal and a passivated CZT crystals. We confirmed that passivation with NaOCl improved the transport property by analyzing the mobility-lifetime product and surface recombination velocity. The electrical and spectroscopic properties of large volume detectors were compared before and after passivation, and then the detectors were observed for a month. Both bar and quasi-hemispherical detectors show an enhancement in performance after passivation. Thus, we could identify the effect of NaOCl passivation on large volume CZT detectors.
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