Issue 9, 2022

Electrical and chemical properties of vacancy-ordered lead free layered double perovskite nanoparticles

Abstract

In this work we synthesized vacancy-ordered lead-free layered double perovskite (LDP) nanoparticles. This structure consists of two layers of trivalent metal halide octahedra [B(III)X6]3− separated by a layer of divalent metal [B(II)X6]4− (B is a divalent or trivalent metal). The chemical formula of this structure is based on A4B(II)B(III)2X12 where A is Cs, B(III) is Bi, X is Cl and B(II) is a different ratio between Mn2+ and Cd2+. Well-defined colloidal nanoplates of Cs4CdxMn1−xBi2Cl12 were successfully synthesized. These nanoplates show photoluminescence (PL) in the orange to red region that can be tuned by changing the Cd/Mn ratio. High resolution scanning transmission electron microscopy (HR-STEM) and atomic resolution elemental analysis were performed on these lead free LDP nanoplates revealing two different particle compositions that can be controlled by the Cd/Mn ratio. Ultraviolet Photoelectron Spectroscopy (UPS) and scanning tunneling spectroscopy (STS) reveal the band gap structure of these LDP nanoplates. Density functional theory (DFT) calculations show the existence of [MnCl6]4− in-gap states. While the absorption occurs from the valence band maximum (VBM) to the conduction band minimum (CBM), the emission may occur from the CBM to an in-gap band maximum (IGM), which could explain the PL in the orange to red region of these nanoplates. This work provides a detailed picture of the chemical and electronic properties of LDP nanoparticles.

Graphical abstract: Electrical and chemical properties of vacancy-ordered lead free layered double perovskite nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
29 জানু. 2022
Accepted
06 ফেব্রু. 2022
First published
10 ফেব্রু. 2022

Nanoscale, 2022,14, 3487-3495

Author version available

Electrical and chemical properties of vacancy-ordered lead free layered double perovskite nanoparticles

A. Sawahreh, T. Binyamin, J. Jiang, O. Millo, O. Goldberg, D. Azulay, R. Pachter and L. Etgar, Nanoscale, 2022, 14, 3487 DOI: 10.1039/D2NR00565D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements