Solution-Processed Halide Perovskite Single Crystals with Intrinsic Compositional Gradients for X-ray Detection
Xin Wang, Yuwei Li, Yubing Xu, Yuzhu Pan, Chongyang Zhu, Dianjia Zhu, Yao Wu, Guanwen Li, Qi Zhang, Qing Li, Xiaobing Zhang, Jun Wu, Jing Chen, Wei Lei
Abstract
Although epitaxial growth is the fundamental method to realize lattice matched heterojunctions in electronics manufacturing, large-scale epitaxial single crystal layers based on solution-processing have rarely been reported. Here, cascade organic–inorganic hybrid perovskite single crystals with purity quotient over 99.9% consisting of chlorine, bromine, and iodine are fabricated by solution-processed epitaxial growth, in which the mismatch rate between adjacent layers is less than 1%. The area of solution-processed epitaxial growth is proved up to 4 cm2, and the speed reaches nearly 100 nm s–1. The resulting high-quality interface effectively improves bonding between adjacent layers, and the average mobility is calculated to be over 200 cm2 V–1 s–1 in samples with different structures. Based on a specific structure with n-type, p-type, and intrinsic layers, a 7.55 mm-thickness X-ray photodiode with sensitivity 1.58 μC mGy–1 cm–2 is fabricated. This work provides a different method for fabricating solution-processed based electronic devices and makes stable perovskite-based devices more accessible.