Issue 10, 2023

Narrow-bandgap Sn–Pb mixed perovskite single crystals for high-performance near-infrared photodetectors

Abstract

Narrow-bandgap Sn–Pb mixed perovskite single crystals are highly promising as photoactive materials for efficient and low-cost near-infrared (NIR) photodetectors. However, because of the significant difference in the crystallization velocities for Pb- and Sn-based perovskites, Sn–Pb mixed perovskites are peculiarly prone to phase separation during the crystallization process, causing the degradation of the optical and electronic properties of materials. Herein, we propose a low-temperature space-confined technique (LT-SCT) that simultaneously reduces the crystallization velocities of pure Sn and Pb perovskites, enabling the fabrication of pure-phase (FASnI3)0.1(MAPbI3)0.9 single crystals. The resulting (FASnI3)0.1(MAPbI3)0.9 single crystals exhibit excellent crystallinity with a high hole mobility of 7.44 × 103 cm2 V−1 s−1 and a low surface trap density of 1.88 × 109 cm−2. These properties benefit the application of (FASnI3)0.1(MAPbI3)0.9 single crystals in self-powered NIR photodetectors and yield outstanding comprehensive performance, especially with a broad linear dynamic range of up to 163.5 dB, a large responsivity (R) of 0.53 A W−1, and a fast response speed of 22.78 μs in the NIR spectral region (750–860 nm). Furthermore, high-quality NIR imaging and wearable health monitoring are achieved by employing high-performance and self-driven NIR photodetectors. This work contributes to developing Sn–Pb mixed perovskite single crystals and provides a promising candidate for efficient and low-cost NIR photodetection.

Graphical abstract: Narrow-bandgap Sn–Pb mixed perovskite single crystals for high-performance near-infrared photodetectors

Supplementary files

Article information

Article type
Paper
Submitted
19 Oct 2022
Accepted
03 Feb 2023
First published
03 Feb 2023

Nanoscale, 2023,15, 5053-5062

Narrow-bandgap Sn–Pb mixed perovskite single crystals for high-performance near-infrared photodetectors

Z. Chang, Z. Lu, W. Deng, Y. Shi, Y. Sun, X. Zhang and J. Jie, Nanoscale, 2023, 15, 5053 DOI: 10.1039/D2NR05800F

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