Citation:
He, Y. ; Ke, W. ; Alexander, G. C. B. ; McCall, K. M. ; Chica, D. G. ; Liu, Z. ; Hadar, I. ; Stoumpos, C. C. ; Wessels, B. W. ; Kanatzidis, M. G. . Resolving The Energy Of Γ-Ray Photons With Mapbi3 Single Crystals. ACS PHOTONICS 2018, 5, 4132-4138.
Date Published:
OCTAbstract:
Halide perovskites exhibit remarkably high-performance as semiconductors compared to conventional materials because of an unusually favorable combination of optoelectronic properties. We demonstrate here that solution-grown single-crystals of organic–inorganic hybrid perovskite CH3NH3PbI3 (MAPbI3), implemented in a Schottky-type device design, can produce outstanding hard radiation detectors with high spectral response and low dark current for the first time. Schottky-type MAPbI3 detector achieves an excellent energy resolution of 6.8% for 57Co 122 keV gamma ray. The high detector performance is achieved due to the balanced charge collection efficiency for both electrons and holes, reflected in the high mobility-lifetime (μτ) products of both carriers (∼0.8 × 10–3 cm2/V). MAPbI3 also demonstrates remarkably long electron and hole lifetimes (τe = 10 μs and τh = 17 μs) and impressive operational stability over time. Furthermore, dual-source detection of α particle (5.5 MeV) and γ-ray (59.5 keV) from the 241Am radiation source is achieved simultaneously by Schottky-type MAPbI3 detector. These results reveal the great potential of MAPbI3 as a high-performance, low-cost radiation detection material.