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 Fmoverline{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
Highlights
Single crystals of hybrid methylammonium lead halide perovskite MAPbX3 have demonstrated radiation detection capabilities comparable to those of the CdTe and (Cd, Zn)Te radiation sensor materials
Single crystals of lead-free halide double perovskite Cs2AgBiBr6 sensor material manifest a remarkable potential for application in radiation detection and imaging
We focus on exploring advances in crystal growth through comparison of microstructural features recorded by crystals synthesised in a preliminary study with those using an advanced growth approach
Summary
Single crystals of hybrid methylammonium lead halide perovskite MAPbX3 have demonstrated radiation detection capabilities comparable to those of the CdTe and (Cd, Zn)Te radiation sensor materials. Compared to the MAPbX3, single crystals of Cs2AgBiBr6 have an indirect bandgap EG of 2.1 eV, higher q (109–1011 X cm), similar ntrap, modest l (0.5–12 cm2V–1 s–1), lower ls of 2.48–5.95 9 10-3 cm2V-1, and similar sensitivity of 105–1974 lCGyair-1 cm–2 and detection limits of 45.7–59.7 nGyairs-1 [7,8,9,10,11,12]. These electrical and radiation detection performance parameters reflect beneficial chemical composition and crystal structure of the Cs2AgBiBr6 radiation sensor material
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have