Self-powered X-ray detector based on lead halide perovskites under electric field poling effect

A self-powered X-ray detector based on CH 3 NH 3 PbI 3 thick film with both electron and hole transport layers has been prepared by a facile and low-cost solution method. The CH 3 NH 3 PbI 3 thick film has a compact structure and a thickness of 16.5 μm processed by the doctor-blade method. The structure and thickness of CH 3 NH 3 PbI 3 thick film are helpful to improve its efficiency of directly converting X-ray photons into electron-hole pairs. The photoelectric characteristics and operation mechanism with ions migration of the detector were systematically investigated. Meanwhile, the influence of the migration ions on the performance of the X-ray detector was studied by controlling the poling time of ions migration. After poling process, the sensitivity of the self-powered detector enhanced from 65 to 127 µC Gy air −1  cm − 2 under an irradiation dose rate of 0.1584 mGy air s − 1 . Noticeably, with the blade-coating Carbon electrode on the surface of CH 3 NH 3 PbI 3 , the device without encapsulating showed good stability after being exposed to ambient air for two months.