Self-powered visible-light photodetection with emerging lead-free perovskite derivative
Jan 20, 2020
From https://doi.org/10.1007/s40820-020-0371-0 © 2019 V. Pecunia et al.
A research team led by Prof. Pecunia has established the capability of emerging Ag-Bi-I rudorffites, a class of lead-free perovskite derivative, for self-powered visible-light photodetection.
While halide perovskites have emerged as highly attractive candidates for next-generation optoelectronics, the lead content of their mainstream embodiments has raised significant toxicity concerns, thereby preventing their large-scale commercialisation. This has motivated the search for a green route to perovskite-based optoelectronics, which should rely on new lead-free materials with perovskite-inspired properties.
Prof. Pecunia’s team has explored for the first time the photodetection capabilities of Ag-Bi-I rudorffites, a class of emerging perovskite-inspired lead-free absorbers that can be deposited through facile, solution-based methods. This has revealed that photodetectors based on Ag2
can operate without a power supply (self-powered operation), which is particularly attractive for emerging application areas such as wearable health and wellness monitoring. Additionally, these photodetectors exhibit a response that matches well with the sensitivity function of our eyes, and that is particularly insensitive to near-infrared (NIR) light. Therefore, this study demonstrates that Ag2
photodetectors provide an appealing platform for NIR-blind visible-light photodetectors for next-generation optoelectronics.
In addition to assessing the photodetection capabilities of Ag2
, Pecunia’s team has additionally characterised in detail the optoelectronic properties of the Ag2
photoactive layers. This provides insight into the interplay among efficiency, collection distance, and film micro-/nano-structure in Ag2
, and points to future directions that may advance the optoelectronic potential of Ag-Bi-I rudorffites and related lead-free perovskite-inspired materials.
This paper has been published in the journal Nano-Micro Letters
, where it can be freely downloaded under the terms of an open-access license.
V. Pecunia†*, Y. Yuan*, J. Zhao, K. Xia, Y. Wang, S. Duhm, L. Portilla, F. Li, Perovskite-Inspired Lead-Free Ag2
for Self-Powered NIR-Blind Visible Light Photodetection, Nano-Micro Letters
, 12:27, 2020. DOI: 10.1007/s40820-020-0371-0