In this study, we demonstrated an efficient photodetector based on air-processed perovskite films by Spinning-Bathing-Spinning method, and found the performances of the resulting perovskite photodetector were enhanced through 2-ethyl-1-hexylamine (EHA) treatment at the interface between hole-transport layer (HTL) and perovskite layer. It can be seen that the interface treatment improved the hydrophobicity of the crystallization substrate, particularly the hole transport layer (PTAA), thereby optimizing the nucleation and growth of crystals. Consequently, the perovskite thin film exhibited improved morphology with fewer defects, higher surface coverage, and larger grain size. Finally, the device achieved a high external quantum efficiency exceeding 85 %, a low dark current of 7.8 × 10 A/cm at the reverse bias of −0.1 V, and a large of 160 dB. This work provides a template for air-treated perovskite film, which improves the morphology and suppresses the reverse dark current of perovskite films by altering the properties of the interface.

中文翻译：

---

通过 2-乙基-1-己胺界面工程抑制空气处理钙钛矿光电探测器的暗电流

在这项研究中，我们通过旋转-沐浴-旋转方法展示了一种基于空气处理钙钛矿薄膜的高效光电探测器，并发现通过在界面处进行2-乙基-1-己胺（EHA）处理，所得钙钛矿光电探测器的性能得到了增强空穴传输层（HTL）和钙钛矿层之间。可以看出，界面处理提高了结晶基底的疏水性，特别是空穴传输层（PTAA），从而优化了晶体的成核和生长。因此，钙钛矿薄膜表现出改善的形态，缺陷更少，表面覆盖率更高，晶粒尺寸更大。最终，该器件实现了超过85%的高外量子效率、-0.1V反向偏压下7.8×10A/cm的低暗电流和160dB的大电流。这项工作为空气处理的钙钛矿薄膜提供了模板，通过改变界面的性质来改善钙钛矿薄膜的形貌并抑制反向暗电流。