Passivation effect on large volume CdZnTe crystals
- 주제(키워드) Passivation , Sodium hypochlorite , CdZnTe detector , Surface recombination velocity
- 발행기관 한국원자력학회
- 발행년도 2022
- 총서유형 Journal
- DOI http://dx.doi.org/10.1016/j.net.2022.06.005
- KCI ID ART002902842
- 본문언어 영어
초록/요약
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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