Titanium Self-Intercalation in Titanium Diselenide Devices: Insights from In Situ Transmission Electron Microscopy.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40033985.
- Also identified by DOI 10.1002/adma.202418557 and PMC identifier 12038540.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Metallic transition metal dichalcogenides (MTMDCs) are of significant attention for various electronic applications due to their anisotropic conductivity, high electron mobility, superconductivity, and charge-density-waves (CDW). Understanding the correlations between electronic properties and structural transformations is crucial. In this study, a bias-induced structural transformation in vertical CDW-based 1T-TiSe<sub>2</sub> devices, transitioning from a 1T metallic phase to a distorted transition 1T<sub>d</sub> phase and subsequently to an orthorhombic Ti<sub>9</sub>Se<sub>2</sub> conducting phase, is reported. Using ex-situ and in-situ biasing transmission electron microscopy, dynamic structural changes, while electron energy loss spectroscopy analysis revealed valence state modifications in Ti and Se within the Ti-rich layer after biasing, are observed. In addition, the effect of varying 1T-TiSe<sub>2</sub> thickness on the maximum current value is investigated. These observations reveal that increased thickness requires higher voltage to induce phase transitions. These insights contribute to understanding the structural and electronic dynamics of 1T-TiSe<sub>2</sub>, highlighting its potential as a promising material for future CDW-based device applications.