Lee David Sunghwan, Heo Jin Hyuck, Park Jin Kyoung, Kim Bong Woo, Lee Hyong Joon, Song Yun Mi, Im Sang Hyuk
Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Apr 14;13(14):16775-16783. doi: 10.1021/acsami.1c03610. Epub 2021 Mar 31.
Enhancement in weak-light detection and other photodetection properties was observed for organic-inorganic halide perovskite photodetectors as a result of benzylammonium iodide (BzAI) treatment at the methylammonium lead triiodide (MAPbI) and hole-transport layer (HTL) interface. After treatment, growth of the two-dimensional Ruddlesden-Popper perovskite phase was observed at the MAPbI surface, which shifted the overall surface work function upwards and thus effectively facilitated charge transfer across the MAPbI/HTL interface. As a result, the fully fabricated device with 10 mg/mL (BzAI/isopropanol) treatment exhibited shorter rise time () and decay time () of 53 and 38 μs, respectively, compared to and of 214 and 120 μs, respectively, for the pristine MAPbI sample. In addition, the BzAI-treated device exhibited larger linearity compared to the pristine MAPbI sample, demonstrating a high and stable specific detectivity of 1.49 × 10 to 2.14 × 10 Jones under incident light intensity of 10 to 10 mW/cm, respectively.
在甲基碘化铅（MAPbI）与空穴传输层（HTL）界面处进行苄基碘化铵（BzAI）处理后，观察到有机-无机卤化物钙钛矿光电探测器的弱光检测及其他光电探测特性得到增强。处理后，在MAPbI表面观察到二维Ruddlesden-Popper钙钛矿相的生长，这使得整体表面功函数向上移动，从而有效地促进了电荷在MAPbI/HTL界面的转移。结果，与原始MAPbI样品分别为214和120 μs的上升时间（）和衰减时间（）相比，经过10 mg/mL（BzAI/异丙醇）处理的完整器件的上升时间和衰减时间分别缩短至53和38 μs。此外，与原始MAPbI样品相比，经BzAI处理的器件表现出更大的线性度，在10至10 mW/cm的入射光强度下，分别展示出1.49×10至2.14×10 Jones的高且稳定的比探测率。
