High-performance single crystal CH_3NH_3PbI_3 perovskite x-ray detector

摘要

Organic-inorganic hybrid perovskites have exhibited unprecedented advantages for x-ray photon detection due to their exotic properties. Their high-crystalline quality has a great impact for high-detection sensitivity under a low electric field, especially related to the synthesis method. In this work, we analyze the capability of CH_3NH_3PbI_3 (MAPbI_3) perovskites as an x-ray detection material and propose to control the temperature gradient (TG) during the synthesis of MAPbI_3 single crystal perovskites for device fabrication. Our results show that the decreasing TG can effectively reduce the trap density and improve the crystal quality, which could lead to a boosted sensitivity of 1471.7 μC/ Gy_(air)/cm~2 under a low electric field of 3.3 V/mm. In addition, a higher detection sensitivity can be achieved by increasing the electric field. Our work presents a strategy to construct high-performance direct x-ray detectors.