Back to Search
Start Over
Fine-control-valve of halide perovskite single crystal quality for high performance X-ray detection.
- Source :
-
Science Bulletin . Nov2021, Vol. 66 Issue 21, p2199-2206. 8p. - Publication Year :
- 2021
-
Abstract
- Crystal growth rate was greatly controlled through volatilization control valve, which avoid producing a large number of defects because of high growth rate. Constant growth rate leads to high-quality single crystal for high sensitive X-ray detector. [Display omitted] Halide perovskite single crystals (HPSCs) provide a unique platform to study the optoelectronic properties of such emerging semiconductor materials, while the temperature induced crystal growth method often has an increased solute integration speed and/or unavoidable solute consumption, resulting in a soaring or slumping crystal growth rate of HPSCs. Here, we developed a universal and facile solvent-volatilization-limited-growth (SVG) strategy to finely control the crystal growth rate by the fine-control-valve for high quality crystal grown through solution processes. The grown HPSCs by SVG method exhibited a record low trap density of 2.8 × 108 cm−3 and a high charge carrier mobility-lifetime product (μτ product) of 0.021 cm2/V, indicating the excellent crystal quality. The crystal surface defects were further passivated by oxygen suppliers as Lewis base, which led to a reduction of surface leakage current by two times when using for low dose rate X-ray detection. Such HPSC X-ray detector displayed a high sensitivity of 1274 µC/(Gy air cm2) with a lowest detectable dose rate of 0.56 μGy air /s under 120 keV hard X-ray. Further applications including alloy composition analysis and metal flaw detection by HPSC detectors were also demonstrated, which not only shows the bright future for product quality inspection and non-destructive materials analysis, but also paves the way for growing high quality single crystals and fabricating polycrystalline films. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20959273
- Volume :
- 66
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 152630853
- Full Text :
- https://doi.org/10.1016/j.scib.2021.06.016