Double perovskite Cs2AgBiBr6 radiation sensor: synthesis and characterization of single crystals

Abstract

Single crystals of lead-free halide double perovskite Cs2AgBiBr6 sensor material manifest a remarkable potential for application in radiation detection and imaging. In this study, the purity and crystallinity of solution-grown Cs2AgBiBr6 single crystals with cubic Fm$$\overline{3}$$ 3 ¯ m symmetry have been corroborated by powder XRD measurements, while the single crystal XRD patterns reveal the dominant {111} lattice planes parallel to the sample surfaces. A wider range of lower resistivity values (106–109 Ωcm) was obtained from the I-V measurements compared to the 1.55 × 109–6.65 × 1010 Ωcm values from the van der Pauw method, which is typically higher for the Ag than for the carbon paint electrodes. Charge-carrier mobility values estimated from the SCLC method for the carbon paint-Cs2AgBiBr6 (1.90–4.82 cm2V−1 s−1) and the Ag-Cs2AgBiBr6 (0.58–4.54 cm2V−1 s−1) including the density of trap states (109–1010 cm−3) are comparable. Similar values of 1.89 cm2V−1 s−1 and 2.36 cm2V−1 s−1 are derived from the Hall effect measurements for a sample with carbon and Ag electrodes, respectively. The key electrical parameters including the X-ray photoresponse measurements indicate that the Cs2AgBiBr6 samples synthesized in this study satisfy requirements for radiation sensors. Graphical abstract

Self-Powered X-ray Detection and Imaging using Cs2AgBiCl6 Lead-Free Double Perovskite Single Crystal

“…In this perspective, bismuth (Bi)-based halide perovskite, which contains the heaviest element Bi (Z = 83) and exhibits a similar electronic structure to Pb 2+ , is now regarded as a feasible alternative. − Three-dimensional (3D) double perovskite Cs 2 AgBiBr 6 single crystals, − 3D AgBi 2 I 7 SC, two-dimensional (2D) layered (NH 4 ) 3 Bi 2 I 9 SC, and zero-dimensional (0D) MA 3 Bi 2 I 9 SC and Cs 3 Bi 2 I 9 SC have been used to fabricate sensitive X-ray detectors. These bismuth-based halide perovskite SCs have lower biological toxicity, greater thermal and moisture stability, large dark resistivity, and higher activation energy for ionic conduction, which makes them potential candidates for X-ray detection.…”

Investigation of structural and optical properties of MAPbBr3monocrystals under fast electron irradiation

“…MAPbBr 3 could be grown from solution on a large scale (up to tens of centimetres in dimensions) and weight (up to kilograms) at room temperature. The electrical properties of MAPbBr 3 demonstrates high specific resistivity (10 8 O cm) 13 and low concentration of the traps (10 9 cm À3 ), 14 which is essential for the precise operation of the radiation detector. The variety of applications for interaction with alpha, 15,16 betaparticles, 17,18 X-rays, 19,20 g-rays, 21 protons, 22 electrons 23 and neutrons 24 with a wide range of radiation energies and doserates is huge.…”

Lead-free all-inorganic halide double perovskite materials for optoelectronic applications: progress, performance and design

“…79 Wang et al synthesized Cs 4 CuSb 2 Cl 12 NCs through top-down ultrasonic stripping technology, 126 where the interlayer van der Waals force and in-plane chemical bond play key roles. 126 LFAIHDP single crystals can be prepared through hydrothermal synthesis, 129 cooling HX-based precursor solution method, 130 controlled cooling crystallization method, 131,132 and high-temperature molten salt method. 133 The temperature, compound concentration, oxygen, and humidity conditions should be carefully controlled during the synthesis of LFAIHDP single crystals.…”

“…3, scheme 2), 129 Chang et al successfully avoided the formation of Ag vacancies and the subsequent formation of secondary phase Cs 3 Bi 2 Br 9 . Likewise, Cs 2 AgBiBr 6 131 and Cs 2 Ag-BiCl 6 132 single crystals were prepared by adopting the cooling crystallization method. The cooling HX-based precursor solution method and high-temperature molten salt method have been successfully applied for the synthesis of Cs 2 Ag-FeCl 6 130 and Cs 2 NaVCl 6 133 single crystals, respectively.…”

“…LFAIHDP single crystals can be prepared through hydrothermal synthesis, 129 cooling HX-based precursor solution method, 130 controlled cooling crystallization method, 131,132 and high-temperature molten salt method. 133 The temperature, compound concentration, oxygen, and humidity conditions should be carefully controlled during the synthesis of LFAIHDP single crystals.…”