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

Yu Teng; Yong Zhang; Xiaoxuan Xie; Jian Yao; Zhen Zhang; Lin Geng; Pin Zhao; Chengpeng Yang; Wenbin Gong; Xiujun Wang; Ziyi Hu; Lixing Kang; Xiaosheng Fang; Qingwen Li

doi:10.1021/jacs.3c14188

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

J Am Chem Soc. 2024 Mar 6;146(9):6231-6239. doi: 10.1021/jacs.3c14188. Epub 2024 Feb 22.

Authors

Yu Teng^{1

2}, Yong Zhang^{1

3}, Xiaoxuan Xie^{1

4}, Jian Yao^{1

5}, Zhen Zhang¹, Lin Geng¹, Pin Zhao¹, Chengpeng Yang¹, Wenbin Gong¹, Xiujun Wang¹, Ziyi Hu¹, Lixing Kang^{1

5}, Xiaosheng Fang⁶, Qingwen Li^{1

5}

Affiliations

¹ Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P.R. China.
² School of Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China.
³ School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, P.R. China.
⁴ Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, P.R. China.
⁵ School of Nano-Technology and Nano-Bionics, University of Science and Technology of China, Hefei 230026, P.R. China.
⁶ Department of Materials Science, Fudan University, Shanghai 200433, P.R. China.

PMID: 38386884
DOI: 10.1021/jacs.3c14188

Abstract

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 PbI₂@single-walled carbon nanotubes (SWCNTs). The phenomenon of electron transfer between PbI₂ 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 PbI₂ 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.