Highly efficient, self-powered UV photodiodes based on leadfree perovskite nanocrystals through interfacial engineering

Xiaoyu Huang; Hong-Tao Sun; Naoto Shirahata

doi:10.1088/1361-6528/ad0303

Highly efficient, self-powered UV photodiodes based on leadfree perovskite nanocrystals through interfacial engineering

Nanotechnology. 2023 Oct 30;35(3). doi: 10.1088/1361-6528/ad0303.

Authors

Xiaoyu Huang^{1

2}, Hong-Tao Sun¹, Naoto Shirahata^{1

2

3

4}

Affiliations

¹ Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan.
² Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-0814, Japan.
³ Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo 112-8551, Japan.
⁴ CNRS-Saint-Gobain-NIMS, IRL3629, Laboratory for Innovative Key Materials and Structures, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

PMID: 37905410
DOI: 10.1088/1361-6528/ad0303

Abstract

Double perovskite crystals are promising alternatives for lead-based perovskites that has potential to address toxicity and instability issues. In this study, Cs₂AgBiCl₆nanocrystals (NCs) with high absorption coefficients were synthesized by hot-injection method. The bandgap engineering was realized by tuning the halide composition in Cs₂AgBiCl₆to Cs₂AgBiBr₆. Both NCs were used as light-absorbing layers in lead-free perovskite photodiodes that exhibit wavelength-selectivity for UV-visible light operatable even at a bias voltage of 0 V. Cs₂AgBiBr₆-based photodiode exhibits a characteristic detection peak at 340 nm with a responsivity of 3.21 mA W^-1, a specific detectivity up to 8.91 × 10¹⁰Jones and a fast response speed with a rise/fall time of 30/35 ms. The excellent performance of self-driven photodiodes lights up the prospect of lead-free perovskite NCs in highly efficient optoelectronic devices.

Keywords: double perovskite; electron trasportation layer; leadfree perovskite; nanocrystals; photodetectors; self-powered photodiode; solution-processed devices.