Publications by authors named "K S Bayikadi"
The material family halide perovskites has been critical in recent room-temperature radiation detection semiconductor research. Cesium lead bromide (CsPbBr) is a halide perovskite that exhibits characteristics of a semiconductor that would be suitable for applications in various fields. In this paper, we report on the correlations between material purification and crystal material properties.
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- CsPbBr and CsPbCl perovskites show potential for solar cells and radiation detection due to their stability and unique phase transition behavior.
- CsPbBrCl crystals demonstrate a monoclinic structure with a larger unit cell volume than previously thought, with a transition temperature around 37 °C.
- High-quality CsPbBrCl single crystals were used to make γ-ray detectors with a 7.2% energy resolution, indicating low defect densities and promising performance in detecting high-energy radiation.
Atomically dispersed iron sites on nitrogen-doped carbon (Fe-NC) are the most active Pt-group-metal-free catalysts for oxygen reduction reaction (ORR). However, due to oxidative corrosion and the Fenton reaction, Fe-NC catalysts are insufficiently active and stable. Herein, w e demonstrated that the axial Cl-modified Fe-NC (Cl-Fe-NC) electrocatalyst is active and stable for the ORR in acidic conditions with high H O tolerance.
View Article and Find Full Text PDFThe perovskite compound CsPbBr has recently been discovered as a promising room-temperature semiconductor radiation detector, offering an inexpensive and easy-to-manufacture alternative to the current benchmark material Cd Zn Te (CZT). The performance of CsPbBr sensors is evaluated under harsh conditions, such as high radiation doses often found in industrial settings and extreme radiation in space. Results show minimal degradation in detector performance after exposure to 1 Mrad of Co-60 gamma radiation, with no significant change to energy resolution or hole mobility and lifetime.
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- Making efficient semiconductor radiation detectors at room temperature depends on how electrodes are created and arranged.
- Laser scribing, commonly used for perovskite solar cells, is a promising, cost-effective technique for this purpose, but its effectiveness for radiation detectors had not been thoroughly explored.
- Experiments using laser scribing on perovskite CsPbBr detectors showed minimal leakage current and impressive energy resolution in gamma-ray energy peaks, indicating its potential; however, further optimization is needed for narrower pixel gaps.