Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 4620-4624 |
| Number of pages | 5 |
| Journal | Nuclear Engineering and Technology |
| Volume | 54 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2022 Dec |
Bibliographical note
Publisher Copyright:© 2022 Korean Nuclear Society
Keywords
- CdZnTe detector
- Passivation
- Sodium hypochlorite
- Surface recombination velocity
ASJC Scopus subject areas
- Nuclear Energy and Engineering