Electronic Modulation in Site-Selective Occupation of Quasi-2D Triangular-Lattice Cs 2 CuCl 4- x Br x Perovskite Probed by Surface-Sensitive Characterization

A controllable electronic manipulation in a frustrated magnetic system such as solution-based two-dimensional (2D) all-inorganic perovskites offers a possible route for their integrations with electronic and magnetic devices for their advanced applications. Here, we perform element-specific investig...

Full description

Saved in:
Bibliographic Details
Published in:ACS applied materials & interfaces 2020-01, Vol.12 (3), p.4114-4122
Main Authors: Arramel, Xie, Aozhen, Yin, Xinmao, Tang, Chi Sin, Fauzi, Angga Dito, Chi, Xiao, Diao, Caozheng, Sahdan, Muhammad Fauzi, Birowosuto, Muhammad Danang, Dang, Cuong, Rusydi, Andrivo, Wee, Andrew Thye Shen
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A controllable electronic manipulation in a frustrated magnetic system such as solution-based two-dimensional (2D) all-inorganic perovskites offers a possible route for their integrations with electronic and magnetic devices for their advanced applications. Here, we perform element-specific investigations of an emergent class of quasi-2D all-inorganic perovskites Cs CuCl Br with (0 ≤ ≤ 4) using a combination of synchrotron-radiation photoelectron techniques. Surface- and element-sensitive X-ray absorption spectroscopy spectra of Cu edges indicate strong electronic transition that is largely influenced by their halogen content at room temperature. This implies that site-selective occupation largely dominates the electronic transition across the unoccupied states of these series since chlorine atoms possess a stronger electronegative character than bromine atoms. Moreover, the implication of halogen site is reflected in the valence band of Cl-rich copper perovskite in which the valence band edge is closer to Fermi energy ( ) than that of the Br-rich compound. Furthermore, X-ray magnetic circular dichroism spectra of mixed ratio and Br-rich compounds exhibit antiferromagnetism at room temperature. These site-specific magnetic-spectroscopic results are corroborated by density functional theory calculations. The strong electronic modulation and the local magnetic spectroscopy results in these solution-based and low-temperature-growth materials will pave the way toward energy- and cost-efficient perovskite devices.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.9b19517