Wang Pengxiang, Wang Hu, Fu Jie, Dong Hao, Zhang Wenqing, Gao Zijun, Shao Yuchuan
Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2025 Jun 18;17(24):35813-35821. doi: 10.1021/acsami.5c04386. Epub 2025 Jun 4.
The radiation detection performances of perovskites have significantly outperformed those of many traditional semiconductors. However, achieving high-quality perovskite detectors remains challenging due to bias-induced ion migration. The primary concern is the lack of recovery strategies to promptly heal migrated ions during operation, realizing high device stability and exceptional optoelectronic performance. Herein, we proposed a proactive healing strategy of migrated ions by alternating current voltage (ACV) to achieve a low current drift and high optoelectronic sensitivity. Under the ACV, bulk ion migration can be effectively controlled to maintain the long-term stability of perovskite devices. The as-grown defects would annihilate during the ACV post-treatment, decreasing defect density and improving crystal quality. Therefore, more stable and balanced hole and electron photoresponses are harvested after the ACV post-treatment. The treated MAPbBr detector exhibits a low dark current drift (∼10 nA cm V s) and excellent sensitivity [5.43 × 10 (hole) and 4.78 × 10 (electron) μC Gy cm]. This work not only demonstrates a deep insight into device healing but also provides an effective post-treatment and operation strategy for perovskite detectors.
钙钛矿的辐射探测性能已显著优于许多传统半导体。然而，由于偏压诱导的离子迁移，制备高质量的钙钛矿探测器仍然具有挑战性。主要问题在于缺乏在操作过程中迅速修复迁移离子的恢复策略，以实现高器件稳定性和卓越的光电性能。在此，我们提出了一种通过交流电压（ACV）对迁移离子进行主动修复的策略，以实现低电流漂移和高光电灵敏度。在ACV作用下，体离子迁移可得到有效控制，从而保持钙钛矿器件的长期稳定性。生长过程中产生的缺陷在ACV后处理过程中会湮灭，降低缺陷密度并提高晶体质量。因此，ACV后处理后可获得更稳定、更平衡的空穴和电子光响应。经过处理的MAPbBr探测器表现出低暗电流漂移（约10 nA cm V s）和优异的灵敏度[5.43×10（空穴）和4.78×10（电子）μC Gy cm]。这项工作不仅深入揭示了器件修复过程，还为钙钛矿探测器提供了一种有效的后处理和操作策略。
