Titanium Self‐Intercalation in Titanium Diselenide Devices: Insights from In Situ Transmission Electron Microscopy
Year: 2025
Type: article
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‐TiSe2 devices, transitioning from a 1T metallic phase to a distorted transition 1Td phase and subsequently to an orthorhombic Ti9Se2 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‐TiSe2 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‐TiSe2, highlighting its potential as a promising material for future CDW‐based device applications.
Source: Advanced Materials
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $6,070
Awards: Develop Industrially Applicable Three-Dimensional Metrology for Semiconductor Innovation( I ), Exploring Novel Materials Kinetics and Their Electron Transport Properties at Atomic Scale( III ), Investigation of Defect Engineering and Structural Evolution in Atomic-Layered Two Dimensional Materials, Future Semiconductor Technologies Research Center( I ), Twisted Nano-Architectures Based on Freestanding Complex Oxides, Exploring Novel Materials Kinetics and Their Electron Transport Properties at Atomic Scale( II ), G8712306651
OpenAlex ID: W4408161779