Issue 48, 2021

Cage-incorporation of secondary amine in Ruddlesden–Popper 2D hybrid perovskite with strong photoconductivity and polarization response

Abstract

Two-dimensional (2D) Ruddlesden–Popper hybrid perovskites (RPHPs) have shown enormous potential for photoelectric applications owing to their advantages of structural diversity and unique physical properties. Despite extensive studies, the cage-incorporation of secondary amines (e.g., dimethylamine, DMA) to explore 2D RPHPs remains a great challenge. Herein, we present a new member of 2D RPHPs, (BA)2(DMA)Pb2Br7 (1, BA+ = n-butylammonium), for which organic DMA+ cations are enclosed in perovskite cavities. The inorganic perovskite sheets and organic BA+ spacing layers are arranged in the alternate packings, resembling a 2D quantum-well motif. This feature is advantageous for the photoconductivity properties. Consequently, the crystal-based array detectors of 1 exhibit strong photodetection performances, including high detectivity (2.0 × 1011 Jones), large responsivity (31.1 mA W−1), and fast response time (∼8 μs). Moreover, its intrinsic 2D quantum-well structure endows significant anisotropy of conductivity and optical absorption, which account for the strong polarization response with a large dichroic ratio of ∼1.43, falling in the range of other 2D RPHPs. These results reveal the potential of 1 for photodetection and simultaneously shed light on the research on new candidates of 2D RPHPs.

Graphical abstract: Cage-incorporation of secondary amine in Ruddlesden–Popper 2D hybrid perovskite with strong photoconductivity and polarization response

Supplementary files

Article information

Article type
Paper
Submitted
20 okt 2021
Accepted
11 noy 2021
First published
12 noy 2021

J. Mater. Chem. C, 2021,9, 17349-17356

Cage-incorporation of secondary amine in Ruddlesden–Popper 2D hybrid perovskite with strong photoconductivity and polarization response

B. Wang, H. Chen, W. Guo, Y. Liu, S. Han, L. Hua, L. Tang, J. Luo and Z. Sun, J. Mater. Chem. C, 2021, 9, 17349 DOI: 10.1039/D1TC05064H

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