Issue 4, 2022

A bilayered two-dimensional hybrid perovskite with a cage-templated secondary cation for high efficiency photodetection

Abstract

Two-dimensional (2D) multilayered hybrid perovskites adopting intrinsic quantum-well structures have shown great application potential in the field of optoelectronics. Despite extensive studies, candidate perovskites composed of cage-templated secondary ammonium cations are quite scarce, hindering their application in high efficiency devices. Here, a new 2D hybrid perovskite (IA)2(DMA)Pb2Br7 (1, IA+ = isoamylammonium and DMA+ = dimethylammonium) was synthesised, in which the inorganic bilayered frameworks are templated by secondary organic DMA+ cations in the perovskite cavities. This structural characteristic is distinct from the homologues containing monovalent cations. An alternative array of organic spacing bilayers and inorganic perovskite sheets forms its quantum-well motif, which leads to intriguing physical properties. Consequently, the fabricated crystal-based array detector exhibits highly efficient photodetection behaviors, including a low dark current (∼20 pA), large responsivity (∼110 mA W−1) and high detectivity (∼2.8 × 1011 Jones). These merits are related to the in-plane photoactivity of the perovskite sheets and low dark current of the insulated organic spacing bilayers. Besides, our photodetector also enables a response to polarized light with a dichromatic ratio of ∼1.15. These findings pave the way to design new photoactive hybrid perovskites and reveal their potential for application in high-performance optoelectronic devices.

Graphical abstract: A bilayered two-dimensional hybrid perovskite with a cage-templated secondary cation for high efficiency photodetection

Supplementary files

Article information

Article type
Research Article
Submitted
20 Oct 2021
Accepted
19 Dec 2021
First published
20 Dec 2021

Inorg. Chem. Front., 2022,9, 637-644

A bilayered two-dimensional hybrid perovskite with a cage-templated secondary cation for high efficiency photodetection

L. Tang, H. Chen, Y. Ma, Y. Liu, L. Hua, L. Lu, B. Wang, S. Han, Z. Sun and J. Luo, Inorg. Chem. Front., 2022, 9, 637 DOI: 10.1039/D1QI01326B

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