@article{Luo2026, 
author = {Wenjie Luo and Pengshuo Gan and Binyun Han and Kaixin Huang and Xingzhou Su and Wenxuan Yang and Qing Zhong and Hao Huang and Yang Zhang and Xue-Feng Yu and Yongfeng Yang and Chang Liu and Zheng Liu and Wenhua Zhou and Yanliang Liu},
title = {Perovskite defect passivation for efficient photon-counting detector},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {6},
pages = {94908490},
keywords = {MAPbI3 perovskite, photon-counting detectors, modification, defect passivation},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908490},
doi = {10.26599/NR.2026.94908490},
abstract = {Although metal halide perovskites have advanced rapidly in photoelectrical detection, studies on perovskite-based photon-counting detector remain scarce. This study reports an efficient perovskite photon-counting detector achieved through defect passivation of the perovskite photosensitive layer. Urea, a Lewis base, was introduced as an additive during the two-step fabrication of MAPbI3 films, forming a complex (MAI·PbI2·O=C(NH2)2, where MAI = methylammonium iodide) that slowed the reaction rate and promoted complete reaction between MAI and PbI2. Compared to conventional perovskite films, the optimized MAPbI3 film exhibits enhanced crystallinity, with enlarged grain size from 254.8 to 908.1 nm, and reduced defect density from 9.08 × 1015 to 3.89 × 1015 cm−3. The resulting MAPbI3 photodiode detector demonstrates satisfactory performance, achieving a responsivity of 0.4 A/W and a sensitivity of 2.39 × 1013 Jones under 17.02 μW/cm2 illumination. Furthermore, a photon-counting system integrated with the MAPbI3 photodetector was able to detect low light levels down to 2.01 × 103 photons per mm2, with a photoresponse three times higher than that of silicon-based photon-counting detector.}
}