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Purification and Improved Photoelectric Properties of Lead-Free Perovskite Cs 3 Bi 2 Br 9 Crystals.
- Source :
- Crystals (2073-4352); Jun2023, Vol. 13 Issue 6, p871, 10p
- Publication Year :
- 2023
-
Abstract
- The lead-free halide perovskite Cs<subscript>3</subscript>Bi<subscript>2</subscript>Br<subscript>9</subscript> is a promising semiconductor material for room-temperature X-ray detection due to its excellent properties. However, material purity and crystal quality still limit the use of Cs<subscript>3</subscript>Bi<subscript>2</subscript>Br<subscript>9</subscript> crystals as detectors. In this work, we present a highly efficient purification method using continuous vacuum extraction to sublimate BiBr<subscript>3</subscript> precursors for Cs<subscript>3</subscript>Bi<subscript>2</subscript>Br<subscript>9</subscript>. Impurity analysis via inductively coupled plasma mass spectroscopy showed that the purification method successfully removed most of the impurities in BiBr<subscript>3</subscript> precursors and improved the purity by at least one order of magnitude. Centimeter-sized Cs<subscript>3</subscript>Bi<subscript>2</subscript>Br<subscript>9</subscript> single crystals were grown by the vertical Bridgman method. The improved properties after purification were confirmed by UV-Vis-NIR spectra, infrared transmittance, and current–voltage (I–V) measurements. The results showed that the average transmittance of Cs<subscript>3</subscript>Bi<subscript>2</subscript>Br<subscript>9</subscript> crystals significantly increased from 62% to 75% in the 0.5–20 μm spectral range. Additionally, the resistivity increased by nearly three orders of magnitude from 5.0 × 10<superscript>9</superscript> Ω·cm to 2.2 × 10<superscript>12</superscript> Ω·cm, meaning the material will have low leakage currents and be suitable for developing applications for room temperature radiation detection. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734352
- Volume :
- 13
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Crystals (2073-4352)
- Publication Type :
- Academic Journal
- Accession number :
- 164612678
- Full Text :
- https://doi.org/10.3390/cryst13060871