Saleem Muhammad Imran, Chandrasekar Perumalveeramalai, Batool Attia, Lee Jeong-Hwan
Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea.
School of Science, Minzu University of China, Beijing 100081, China.
Micromachines (Basel). 2023 Oct 19;14(10):1949. doi: 10.3390/mi14101949.
The process of the aqueous synthesis of nanomaterials has gained considerable interest due to its ability to eliminate the need for complex organic solvents, which aligns with the principles of green chemistry. Fabricating nanostructures in aqueous solutions has gained recognition for its potential to develop ultrasensitive, low-energy, and ultrafast optoelectronic devices. This study focuses on synthesizing lead iodide (PbI) nanoplates (NPs) using a water-based solution technique and fabricating a planar photodetector. The planar photodetectors (ITO/PbI NPs/Au) demonstrated a remarkable photosensitivity of 3.9 × 10 and photoresponsivity of 0.51 mA/W at a wavelength of 405 nm. Further, we have carried-out analytical calculations for key performance parameters including open-circuit voltage (), short-circuit current (), on-off ratio, responsivity (), and specific detectivity (*) at zero applied bias, while photodetector operating in self-powered mode. These values are as follows: = 0.103 V = 1.93 × 10, on-off ratio = 10, 4.0 mA/W, and * = 3.3 × 10 Jones. Particularly, the asymmetrical output properties of ITO/PbI NPs/Au detector provided additional evidence of the effective creation of a Schottky contact. Therefore, the photodetector exhibited a photo-response even at 0 V bias (rise/decay time ~1 s), leading to the realization of self-powered photodetectors. Additionally, the device exhibited a rapid photo-response of 0.23/0.38 s (-5 V) in the visible range. This study expands the scope of aqueous-phase synthesis of PbI nanostructures, enabling the large-area fabrication of high-performance photodetectors.
由于水相合成纳米材料能够消除对复杂有机溶剂的需求，符合绿色化学的原则，因此该合成过程引起了广泛关注。在水溶液中制备纳米结构因其在开发超灵敏、低能耗和超快光电器件方面的潜力而受到认可。本研究重点在于使用水基溶液技术合成碘化铅（PbI）纳米片（NPs）并制造平面光电探测器。平面光电探测器（ITO/PbI NPs/Au）在405nm波长下表现出3.9×10的显著光敏性和0.51mA/W的光响应率。此外，我们在零偏压下对包括开路电压（）、短路电流（）、开/关比、响应率（）和比探测率（）在内的关键性能参数进行了分析计算，此时光电探测器以自供电模式工作。这些值如下： = 0.103V = 1.93×10，开/关比 = 10， 4.0mA/W， = 3.3×10琼斯。特别是，ITO/PbI NPs/Au探测器的不对称输出特性为有效形成肖特基接触提供了额外证据。因此，该光电探测器即使在0V偏压下也表现出光响应（上升/衰减时间约为1s），从而实现了自供电光电探测器。此外，该器件在可见光范围内表现出快速的光响应，在-5V时为0.23/0.38s。本研究扩展了PbI纳米结构水相合成的范围，实现了高性能光电探测器的大面积制造。
