Improved performance and stability in CH3NH3PbI3/Si heterojunction photodetectors realized by ZIF-67 additive assisted Co ion doping

Lead halide perovskites have been regarded as promising materials for fabrication of high-performance photodetectors (PDs). However, spin-coated perovskite thin films generally suffered from high-density grain boundaries and defect states, which severely deteriorated the performance stability resulting PDs. Fortunately, above issues can be effectively solved via additive assisted metal ions doping. In this work, Co-based zeolite imidazole framework (ZIF-67) Co ion doping has proposed to prepare high-quality CH3NH3PbI3 (MAPbI3) films. Morphological, structural, optical, electrical studies shown that decreased well suppressed greatly enhanced MAPbI3/Si heterojunction PDs, including reducing dark current, increasing photocurrent, response speed. Finally, mechanisms suppression states benefiting were discussed based on density functional theory calculations. The results provided in work will pave way development stable MAPbI3 PDs future.