Related Experiment Video
Updated: Jul 15, 2025
Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
Published on: May 17, 2024
High-Performance Thermoelectric Flexible Ag2Se-Based Films with Wave-Shaped Buckling via a Thermal Diffusion Method
Junze Zhang1, Mohammad Nisar1, Hanwen Xu1
1Shenzhen Key Laboratory of Advanced Thin Films and Applications, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China.
This study presents a novel thermal diffusion method for creating flexible silver selenide (Ag2Se) thin films. Optimized films exhibit high thermoelectric performance and mechanical flexibility, paving the way for efficient low-grade heat energy harvesting.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Energy Harvesting
Background:
- Flexible thermoelectric materials are crucial for waste heat recovery.
- Developing efficient and scalable fabrication methods for thermoelectric thin films remains a challenge.
Purpose of the Study:
- To develop a novel thermal diffusion method for fabricating n-type Ag2Se flexible thin films.
- To optimize thermoelectric performance and mechanical properties through controlled fabrication parameters.
- To explore the potential of these films for low-grade heat energy utilization.
Main Methods:
- Fabrication of Ag2Se thin films on polyimide (PI) substrates using a novel thermal diffusion technique.
- Optimization of film properties by adjusting pressure and temperature during thermal diffusion.
- Characterization of structural, electrical, and thermoelectric properties.
- Finite element analysis (FEA) to simulate temperature difference capabilities.
- Assembly of a flexible thermoelectric module.
Main Results:
- Ag2Se films exhibited (013) preferred orientations, enhancing the Seebeck coefficient.
- Electrical conductivity was tuned by thermal diffusion temperature, attributed to increased electric mobility.
- Achieved a high power factor of 18.25 μW cm⁻¹ K⁻² at room temperature, peaking at 21.7 μW cm⁻¹ K⁻² at 393 K.
- Wave-shaped buckling morphology demonstrated potential for larger temperature differences and exhibited excellent mechanical properties (elasticity modulus of 0.42 GPa).
- A flexible module generated 166 nW output power at a 50 K temperature difference.
Conclusions:
- The novel thermal diffusion method provides a scalable route for preparing high-performance flexible Ag2Se thin films.
- Microstructure optimization via controlled thermal diffusion is key to enhancing thermoelectric properties.
- The developed flexible thermoelectric films and modules show promise for efficient low-grade heat energy harvesting applications.
