Journal
SENSORS
Volume 19, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/s19153271
Keywords
CdZnTeSe detectors; chemical passivation; gamma-ray detector; nuclear radiation detector; X-ray detector
Funding
- U.S. Department of Energy, Office of Defense Nuclear Nonproliferation Research and Development
- National Science Foundation (NSF) HBCU-UP Program [1818732]
- NSF Louis Stokes Alliances for Minority Participation (LSAMP)
- DNN RD [NA-22]
- Direct For Education and Human Resources
- Division Of Human Resource Development [1818732] Funding Source: National Science Foundation
Ask authors/readers for more resources
Cadmium zinc telluride selenide (Cd1-xZnxTe1-ySey or CZTS) is one of the emerging CdTe-based semiconductor materials for detecting X- and gamma-ray radiation at or near room temperature (i.e., without cryogenic cooling). Potential applications of CZTS sensors include medical imaging, X-ray detection, and gamma-ray spectroscopy. Chemical passivation of CZTS is needed to reduce the conductivity of Te-rich surfaces, which reduces the noise and improves the device performance. In this study, we focus on the effect of surface passivation of CZTS using a 10% aqueous solution of ammonium fluoride. The effects of the chemical treatment were studied on the leakage current, charge transport measured as the electron mobility-lifetime (mu tau) product, and the spectral resolution measured as the full-width at half-maximum (FWHM) of specific peaks. After passivation, the leakage current increased and began to decrease towards pre-passivation levels. The energy resolutions were recorded for eight applied voltages between -35 V and -200 V. The results showed an average of 25% improvement in the detector's energy resolution for the 59.6 keV gamma peak of Am-241. The electron mu tau product was unchanged at 2 x 10(-3) cm(2)/V. These results show that ammonium fluoride is effective for chemical passivation of CZTS detectors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available