AUTHOR=Feng Anbo , Xie Shengdan , Fu Xiuwei , Chen Zhaolai , Zhu Wei 

TITLE=Inch-Sized Thin Metal Halide Perovskite Single-Crystal Wafers for Sensitive X-Ray Detection

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 9 - 2021

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2021.823868

DOI=10.3389/fchem.2021.823868

ISSN=2296-2646

ABSTRACT=Metal halide perovskite single crystals are promising for X-ray detection due to their large atomic number, high carrier mobility and lifetime. However, it is still challenging to grow large-area and thin single crystals directly onto substrates to meet real-world applications. In this work, millimeter-thick and inch-sized methylammonium lead tribromide (MAPbBr3) single-crystal wafers are grown directly grown on indium tin oxide (ITO) substrates through controlling the distance between solution surface and substrates. The single-crystal wafers are polished and treated with O3 to achieve smooth surface, lower trap density and better electrical properties. X-ray detectors with high sensitivity of 632µC Gyair–1 cm–2 under -5V and 525 µC Gyair–1 cm–2 under –1 V bias can be achieved. This work provides an effective way to fabricate substrate-integrated, large-area, and thickness-controlled perovskite single-crystal X-ray detectors, which is instructive for developing imaging application based on perovskite single crystals.