Khan Abbas Ahmad, Kumar Navneet, Jung Uijin, Heo Wonjun, Tan Zhaozhong, Park Jinsub
Department of Electronic Engineering, Hanyang University, Seoul 04763, Republic of Korea.
Division of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, Republic of Korea.
Nanoscale Horiz. 2023 Oct 23;8(11):1577-1587. doi: 10.1039/d3nh00263b.
Hybrid organic-inorganic metal halide perovskites (HOIPs) have gained significant research interest due to their tunable optoelectronic properties and ease of fabrication. Enhancing the stability and efficiency of perovskite materials can be achieved through the passivation of defective surfaces and the improvement of interfacial properties. In this study, we introduce a zwitterionic compound, PPS (3-(1-pyridinio)-1-propanesulfonate), as a bifunctional material that serves as an additive and an interlayer. Incorporating PPS into the perovskite film effectively reduces both positively and negatively charged defects, leading to improved surface morphology and a reduction in undesired charge carrier recombination. Additionally, the formation of a PPS interlayer on SnO improves the SnO/perovskite interfacial characteristics, thereby enhancing charge carrier extraction. As a result, the photodetector exhibits a low dark current of 6.05 × 10 A, an excellent responsivity of 5.93 A W, a detectivity of 1.51 × 10 J, and an on/off ratio of 1.2 × 10 under open-air conditions. Moreover, the device demonstrates outstanding stability, retaining 80% of its original responsivity in an ambient environment. This work highlights the great potential of dual-functional materials for defect passivation in future optoelectronic devices, emphasizing the importance of surface modification and interface engineering for improved performance and stability.
有机-无机杂化金属卤化物钙钛矿（HOIPs）因其可调节的光电特性和易于制备而受到了广泛的研究关注。通过对有缺陷的表面进行钝化以及改善界面特性，可以提高钙钛矿材料的稳定性和效率。在本研究中，我们引入了一种两性离子化合物PPS（3-(1-吡啶基)-1-丙烷磺酸盐），作为一种双功能材料，它既可以作为添加剂，又可以作为中间层。将PPS掺入钙钛矿薄膜中可有效减少带正电和带负电的缺陷，从而改善表面形貌并减少不希望的电荷载流子复合。此外，在SnO上形成PPS中间层可改善SnO/钙钛矿的界面特性，从而增强电荷载流子的提取。结果，该光电探测器在露天条件下表现出6.05×10 A的低暗电流、5.93 A W的优异响应度、1.51×10 J的探测率以及1.2×10的开/关比。此外，该器件表现出出色的稳定性，在环境条件下保持其原始响应度的80%。这项工作突出了双功能材料在未来光电器件中进行缺陷钝化的巨大潜力，强调了表面改性和界面工程对提高性能和稳定性的重要性。
