Interfacial Electron Transfer in PbI2@Single-Walled Carbon Nanotube van der Waals Heterostructures for High-Stability Self-Powered Photodetectors

作者：Yu Teng, Yong Zhang, Xiaomei Xie, Jian Nian Yao, Zhen Zhang, Lin Geng, Pin Zhao, Chengpeng Yang, Wenbin Gong, Xiujun Wang, Ziyi Hu, Lixing Kang, Xiaosheng Fang, Qingwen Li · 发表于：Journal of the American Chemical Society · 年份：2024 · DOI：10.1021/jacs.3c14188 · 被引用次数：46 · 研究领域：2D Materials and Applications、Graphene research and applications、Advanced Thermoelectric Materials and Devices

Acquiring a deep insight into the electron transfer mechanism and applications of one-dimensional (1D) van der Waals heterostructures (vdWHs) has always been a significant challenge. Herein, through direct observation using aberration-corrected transmission electron microscopy (AC-TEM), we verify the stable formation of a high-quality 1D heterostructure composed of PbI 2 @single-walled carbon nanotubes (SWCNTs). The phenomenon of electron transfer between PbI 2 and SWCNT is elucidated through spectroscopic investigations, including Raman and X-ray photoelectron spectroscopy (XPS). Electrochemical testing indicates the electron transfer and enduring stability of 1D PbI 2 within SWCNTs. Moreover, leveraging the aforementioned electron transfer mechanism, we engineer self-powered photodetectors that exhibit exceptional photocurrent and a 3-order-of-magnitude switching ratio. Subsequently, we reveal its unique electron transfer behavior using Kelvin probe force microscopic (KPFM) tests. According to KPFM, the average surface potential of SWCNTs decreases by 80.6 mV after filling. Theoretical calculations illustrate a charge transfer of 0.02 e per unit cell. This work provides an effective strategy for the in-depth investigation and application of electron transfer in 1D vdWHs.