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Photothermal-Mediated Carrier Dynamics in Ti3C2Tx MXene Revealed by Time-Resolved Terahertz Spectroscopy
Xiaoli Guan1,2, Xiaoyin Chen2, Chuan Bai2
1College of Materials Science and Engineering, Sichuan University, Chengdu, China.
Small (Weinheim an Der Bergstrasse, Germany)
|February 24, 2026
Summary
Researchers studied how light affects charge carriers in 2D Titanium Carbide (Ti3C2Tx) MXene films. They found that controlling heat flow at interfaces is key to managing carrier behavior for better electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- 2D Titanium Carbide (Ti3C2Tx) MXene films possess remarkable electrical and thermal conductivity.
- The relationship between heat dissipation in the lattice and carrier behavior after light exposure is not fully understood.
Purpose of the Study:
- To investigate photothermal-mediated carrier relaxation mechanisms in Ti3C2Tx MXene films.
- To explore the influence of film thickness and interfacial thermal boundary conductance (TBC) on carrier dynamics.
Main Methods:
- Time-resolved terahertz spectroscopy was employed to study Ti3C2Tx MXene films with varying layer numbers.
- Interfacial TBC was engineered by selecting different substrates.
Main Results:
- Carrier relaxation time showed a linear dependency on film thickness, correlating with lattice cooling.
- Modulation of transient carrier relaxation was achieved by engineering interfacial TBC.
- Strong carrier-phonon coupling was confirmed as the cause of photothermal-mediated relaxation.
Conclusions:
- Interface engineering offers a method to control carrier relaxation in Ti3C2Tx MXene.
- These findings advance the design of MXene for optoelectronics and energy applications.
- The study provides insights into heat management in quantum materials.
