Spectrometric performance of CsPbBr3 perovskite crystals grown by the Bridgman method with preliminary zone-refining

AbstraktAbstract

We present the results of measurements on CsPbBr3 perovskite single crystals grown by the Bridgman method with preliminary zone-refining. The crystals had a specific resistivity, ρ, of 1.1 × 109 Ω cm, a trap concentration, ηtrap, of 3.46 × 109 cm−3 and a hole mobility, μh, of 34.02 cm2 V−1 ·s−1. The hole mobility-lifetime products (μτ), as determined from a Hecht analysis, was in the range (1.2–2.1) × 10−3 cm2/V, depending on electrode geometry. The spectral performance of detectors fabricated from single crystals of dimensions 4.6 × 4.6 × 2.2 mm3 were evaluated over the energy range (5.9–1332) keV. Three detector structures were fabricated: a planar, planar with guard ring and a ring-electrodes geometry. The energy resolution of the detectors was determined using standard radioactive sources: 55Fe, 241Am, 57Co, 137Cs and 60Co. For the detector utilizing a ring-electrodes geometry, the measured FWHM energy resolutions were: ≤2.6 keV at 5.9 keV, 3.0 keV (5.0 %) at 59.5 keV, 3.4 keV (2.8 %) at 122 keV, 6.2 keV (0.94 %) at 662 keV, 10.3 keV (0.89 %) at 1173 keV and 11.5 keV (0.86 %) at 1332 keV. The energy resolution of the planar detector with a guard ring was 3.4 keV (5.7 %) at 59.5 keV, 3.8 keV (3.1 %) at 122 keV and 5.25 keV (0.79 %) at 662 keV.

We present the results of measurements on CsPbBr3 perovskite single crystals grown by the Bridgman method with preliminary zone-refining. The crystals had a specific resistivity, ρ, of 1.1 × 109 Ω cm, a trap concentration, ηtrap, of 3.46 × 109 cm−3 and a hole mobility, μh, of 34.02 cm2 V−1 ·s−1. The hole mobility-lifetime products (μτ), as determined from a Hecht analysis, was in the range (1.2–2.1) × 10−3 cm2/V, depending on electrode geometry. The spectral performance of detectors fabricated from single crystals of dimensions 4.6 × 4.6 × 2.2 mm3 were evaluated over the energy range (5.9–1332) keV. Three detector structures were fabricated: a planar, planar with guard ring and a ring-electrodes geometry. The energy resolution of the detectors was determined using standard radioactive sources: 55Fe, 241Am, 57Co, 137Cs and 60Co. For the detector utilizing a ring-electrodes geometry, the measured FWHM energy resolutions were: ≤2.6 keV at 5.9 keV, 3.0 keV (5.0 %) at 59.5 keV, 3.4 keV (2.8 %) at 122 keV, 6.2 keV (0.94 %) at 662 keV, 10.3 keV (0.89 %) at 1173 keV and 11.5 keV (0.86 %) at 1332 keV. The energy resolution of the planar detector with a guard ring was 3.4 keV (5.7 %) at 59.5 keV, 3.8 keV (3.1 %) at 122 keV and 5.25 keV (0.79 %) at 662 keV.