MAPbBr3−xIx Crystals Improved by Accurate Solution-Grown Procedure for Alpha Particle Detection

Abstract

High-quality organic-inorganic halide perovskite brings an opportunity for ideal nuclear radiation detection due to its large carrier mobility, lifetime, and heavy atoms. However, the relatively low bulk resistivity restricts its development for alpha particles and X/γ-ray detectors. Here, we report on the MAPbBr 3−x I x (MPB:I) perovskite crystals grown using the modified inverse temperature crystallization method. Based on the measured supersolubility and solubility curves, the heating procedure was accurately designed to control the nucleation and growth rate. The resulting MPB:I single crystals exhibit higher bulk resistivity of 1.4 × 10 9 cm, which is 10 times that obtained from the traditional inverse temperature crystallization method. Finally, an uncollimated 0.8 µCi 241 Am 5.48 MeV alpha particles source was adopted to evaluate the MPB:I single crystals at room temperature condition. The electron mobility (µ e ) and mobility-lifetime product (µτ ) e of (264.6 ± 6.5) cm 2 V −1 s −1 and (2.6 ± 0.3) × 10 −3 cm 2 /V, respectively, were obtained.

(C7H11N2)2MBr4 (M=Cu, Zn): X‐Ray Sensitive 0D Hybrid Metal Halides with Tunable Broadband Emission

“…It should be noted that the mobility determined here is an estimation value as the possible bromide ionic migration is not considered. Although the carrier mobility determined for the 0D halide (DMAP) 2 ZnBr 4 is lower than that of the parent 3D perovskites (e. g., 264.6 � 6.5 cm 2 /V-s for MAPbBr 3-x I x , 4.4 cm 2 /V-s for FAPbI 3 ), [43][44] this value is comparable to that of the other 0D "perovskites" such as Cs 3 Bi 2 I 9 and FA 3 Bi 2 I 9 . [45][46] The title compounds show much better long-term airstability (Figure 2c) as compared to FAPbI 3 , which is beneficial for long-term use of these materials in devices.…”

Solution-Grown Formamidinium Hybrid Perovskite (FAPbBr3) Single Crystals for α-Particle and γ-Ray Detection at Room Temperature

“…However, MA-based lead halide perovskites were still limited due to their high trap density (∼10 10 cm –3 ), relatively low intrinsic resistivity (10 7 to 1.5 × 10 9 Ω·cm), and tendency to show instability in their baseline dark current and significant ion migration phenomena. Although many strategies, such as element doping, − electrode design, ,, and defect passivation engineering, − were adopted previously and great achievements were obtained, sufficient optimization of the above parameters has still not been reached. The key problems for their applications were the poor chemical and structural stability and ionic migration phenomenon. , …”

Metal Halide Perovskites for High‐Energy Radiation Detection

“…[15] The main concern regarding MHPs for PV applications right now is their apparently inherent chemical and structural instability under ambient conditions, a topic that is currently attracting increasing attention. [16,17] Looking beyond PVs, MHPs continue to demonstrate the huge potential for application in a wider range of opto/electronics including lasers, [18] light-emitting diodes, [19] photodetectors, [20] sensors, [21][22][23] and particle detectors, [24][25][26][27] to name a few. In the area of sensing applications, MHPs have demonstrated the ability to transduce different environmental stimuli into an optical or electrical signal, which can be seen as an added advantage for applications in the field of sensing.…”

“…Looking beyond PVs, MHPs continue to demonstrate the huge potential for application in a wider range of opto/electronics including lasers, [ 18 ] light‐emitting diodes, [ 19 ] photodetectors, [ 20 ] sensors, [ 21–23 ] and particle detectors, [ 24–27 ] to name a few. In the area of sensing applications, MHPs have demonstrated the ability to transduce different environmental stimuli into an optical or electrical signal, which can be seen as an added advantage for applications in the field of sensing.…”