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Passivation effect on Cd0.95Mn0.05Te0.98Se0.02 radiation detection performance.
1Marine Radioactivity Monitoring Group, Korea Marine Environment Management Corporation, Busan 48931, Republic of Korea; Interdisciplinary Program in Precision Public Health, Korea university, Seoul 02841, Republic of Korea.
Summary
Sodium hypochlorite (NaOCl) passivation effectively addresses Te-rich surface layers in cadmium telluride (CdTe) detectors. This method enhances charge carrier transport and reduces leakage current, improving detector performance.
Area of Science:
- Materials Science
- Semiconductor Physics
- Detector Technology
Background:
- Bromine etching in cadmium telluride (CdTe) detector fabrication creates Te-rich surface layers.
- These Te-rich layers act as charge carrier traps, degrading transport properties and increasing leakage current.
- This negatively impacts the overall performance and reliability of CdTe-based detectors.
Purpose of the Study:
- To investigate the efficacy of sodium hypochlorite (NaOCl) as a passivating agent for CdTe-based detectors.
- To analyze the impact of NaOCl passivation on the surface chemistry and performance of Cd0.95Mn0.05Te0.98Se0.02 (CMTS) detectors.
- To demonstrate the potential of NaOCl in mitigating fabrication-induced surface defects.
Main Methods:
- Passivation of CMTS samples using sodium hypochlorite (NaOCl) solution.
- Surface chemical analysis using X-ray photoelectron spectroscopy (XPS) to determine surface composition and chemical states.
- Performance evaluation of passivated CMTS detectors using an Am-241 radioisotope source.
Main Results:
- XPS analysis confirmed the formation of tellurium oxide and the removal of water from the CMTS surface after NaOCl passivation.
- Passivated CMTS detectors exhibited significantly reduced leakage current compared to unpassivated samples.
- Enhanced detector performance was observed, indicated by improved charge carrier transport and reduced charge loss.
Conclusions:
- Sodium hypochlorite (NaOCl) passivation is an effective method to treat Te-rich surface layers in CMTS detectors.
- NaOCl passivation successfully reduces leakage current and compensates for surface defects.
- The improved charge carrier transport and reduced charge loss lead to enhanced performance of CMTS detectors.
