Low defects density CsPbBr3 single crystals grown by an additive assisted method for gamma-ray detection. Issue 33 (13th August 2020)

• Record Type: Journal Article
• Authors: Feng, Yuanxiang; Pan, Lei; Wei, Haotong; Liu, Ye; Ni, Zhenyi; Zhao, Jingjing; Rudd, Peter N.; Cao, Lei R.; Huang, Jinsong
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 33(2020)
• Page Start: 11360
• Page End: 11368
• Publication Date: 2020-08-13
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc02706e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : 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 ( μτ ) product, and tunable bandgap. Abstract : 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 ( μτ ) 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 CsPbBr3 single crystal is able to acquire an energy spectrum from a cesium-137 ( 137 Cs) source with a resolution of 5.5% at 662 keV.