光电二极管
暗电流
光电流
钙钛矿(结构)
材料科学
光电子学
光电探测器
量子效率
化学
结晶学
作者
Zhao‐Yang Yin,Yang Chen,Yangyang Zhang,Yu Yuan,Qian Yang,Ya‐Nan Zhong,Xu Gao,Jing Xiao,Zhao‐Kui Wang,Jianlong Xu,Sui‐Dong Wang
标识
DOI:10.1002/adfm.202302199
摘要
Abstract Minimizing reverse bias dark current density ( J dark ) while retaining high external quantum efficiency is crucial for promising applications of perovskite photodiodes, and it remains challenging to elucidate the ultimate origin of J dark . It is demonstrated in this study that the surface defects induced by iodine vacancies are the main cause of J dark in perovskite photodiodes. In a targeted way, the surface defects are thoroughly passivated through a simple treatment with butylamine hydroiodide to form ultrathin 2D perovskite on its 3D bulk. In the passivated perovskite photodiodes, J dark as low as 3.78 × 10 ‐10 A cm ‐2 at ‐0.1 V is achieved, and the photoresponse is also enhanced, especially at low light intensities. A combination of the two improvements realizes high specific detectivity up to 1.46 × 10 12 Jones in the devices. It is clarified that the trap states induced by the surface defects can not only raise the generation‐recombination current density associated with the Shockley–Read–Hall mechanisms in the dark (increasing J dark ), but also provide additional carrier recombination paths under light illumination (decreasing photocurrent). The critical role of surface defects on J dark of perovskite photodiodes suggests that making trap‐free perovskite thin films, for example, by fine preparation and/or surface engineering, is a top priority for high‐performance perovskite photodiodes.
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