Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 33, Pages 11360-11368Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc02706e
Keywords
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Funding
- Department of the Defense, Defense Threat Reduction Agency [HDTRA1170054]
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Metal halide perovskites have arisen as a new family of semiconductors for radiation detectors due to their high stopping power, large and balanced electron-hole mobility-lifetime (mu tau) product, and tunable bandgap. Here, we report a simple and low-cost solution processing approach using additive-assisted inverse temperature crystallization (ITC) to grow cesium lead bromide (CsPbBr3) single crystals with low-defect density. Crystals grown from precursor solutions without additives tend to grow fastest along the [002] direction, resulting in crystals shaped as small elongated bars. The addition of choline bromide (CB) proves to mediate the crystallization process to produce large single crystals with a cuboid shape, allowing for more practical fabrication of gamma-ray detectors. This new additive-assisted growth method also improves the resulting crystal quality to yield a reduction in the density of trap states by over one order of magnitude, relative to a crystal grown without CB. The detector fabricated from a CB-assisted solution-grown perovskite CsPbBr(3)single crystal is able to acquire an energy spectrum from a cesium-137 (Cs-137) source with a resolution of 5.5% at 662 keV.
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