@article{Zhang2025, 
author = {Yong Zhang and Zishen Zhao and Xu Zhang and Kunjie Wang and Lin Geng and Yanyan Zhao and Shuaiwei Huang and Jiadong Shen and Xiujun Wang and Chun Zhao and Lin Wang},
title = {Light-switchable 1D CsPbI3@SWCNTs van der Waals heterostructures for negative photodetection and photosynapse devices},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {11},
pages = {94908089},
keywords = {photodetectors, single-walled carbon nanotubes, halide perovskite, photosynapse device},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94908089},
doi = {10.26599/NR.2025.94908089},
abstract = {The applications of one-dimensional (1D) halide perovskite heterostructures based on single-walled carbon nanotubes (SWCNTs) remain an unresolved challenge. Herein, 1D van der Waals heterostructures composed of CsPbI3 (CPI) encapsulated within semiconducting SWCNTs (CPI@s-SWCNTs) are designed for negative photodetectors and photosynapse devices via modulable photocarrier engineering. A single CPI@SWCNT device demonstrates a notable n-doping effect and exhibits negative photoresponse. Theoretical simulations reveal that the electrons transferred from CPI to SWCNT amount to 0.73e/cell. Large-area CPI@s-SWCNTs film can be obtained through the separation using the ultraviolet (UV) photosensitive polymer poly[9-(1-octyl-9H-carbazol-9-yl)-nonyl] (PCz). Under visible light irradiation, the large-area film device exhibits remarkable negative photoresponse (−9.3 A/W) owing to the photoelectric effect of internally filled CPI. Under UV irradiation, the film device exhibits synaptic behavior of electrical writing and optical erasing due to the persistent photoconductivity effect of the surface polymer PCz. This work not only provides a general strategy for the separation and application of halide perovskite filled SWCNTs, but also paves the way for broader applications of 1D van der Waals heterostructures in multifunctional optoelectronic devices.}
}