@article{Hu2026, 
author = {Chuan-Tao Hu and Fei-Fei Luo and Bo Li and Xi Zhu and Chang-Ze Li and Tao Qin and Yun Sun and Song Qiu and Chi Liu and Dong-Ming Sun},
title = {Decoupling light absorption and carrier transport in Cs3Bi2I9 via carbon nanotube networks for high-performance visible and X-ray photodetection},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {12},
pages = {94909105},
keywords = {lead-free perovskite, Cs3Bi2I9, carbon nanotubes, photodetector, X-ray detection},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94909105},
doi = {10.26599/NR.2026.94909105},
abstract = {Perovskite materials have attracted extensive attention in photodetection owing to their excellent light absorption capability and high carrier generation efficiency. Among them, the lead-free perovskite Cs3Bi2I9 has been widely studied due to its low toxicity and outstanding X-ray sensitivity. However, its relatively low carrier mobility severely restricts the effective transport of photogenerated carriers, thereby limiting key device performance metrics such as responsivity, external quantum efficiency, and detectivity. To address this challenge, a Cs3Bi2I9/carbon nanotubes (CNTs) composite photodetector is developed by introducing CNTs networks as efficient charge transport pathways into the Cs3Bi2I9 photosensitive layer. This hybrid architecture enables a decoupled design of light absorption and carrier transport, where Cs3Bi2I9 serves as the primary light-harvesting medium while CNTs facilitate rapid carrier extraction and transport, effectively suppressing carrier recombination. As a result, the device exhibits excellent performance under 405 nm illumination, achieving a responsivity of 1.44 × 105 A/W and a detectivity of 1.15 × 1016 Jones. In addition, a high X-ray sensitivity of 2.088 × 104 μC/(Gyair·cm2) is achieved. These results demonstrate a new route for advancing lead-free high-performance broadband perovskite optoelectronic devices.}
}