Electronic Modulation in Site-Selective Occupation of Quasi-2D Triangular-Lattice Cs2CuCl4–xBrx Perovskite Probed by Surface-Sensitive Characterization
| Autor: | Andrew T. S. Wee, Xiao Chi, Chi Sin Tang, Muhammad Fauzi Sahdan, Caozheng Diao, Aozhen Xie, Andrivo Rusydi, Cuong Dang, Angga Dito Fauzi, Arramel, Xinmao Yin, Muhammad Danang Birowosuto |
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| Rok vydání: | 2019 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Molecular electronic transition 0104 chemical sciences Chemical physics Halogen General Materials Science Density functional theory Hexagonal lattice 0210 nano-technology Perovskite (structure) |
| Zdroj: | ACS Applied Materials & Interfaces. 12:4114-4122 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | 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 Cs2CuCl4–xBrx with (0 ≤ x ≤ 4) using a combination of synchrotron-radiation photoelectron techniques. Surface- and element-sensitive X-ray absorption spectroscopy spectra of Cu L2,3 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 i... |
| Databáze: | OpenAIRE |
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