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Flexible Ag₂Se Film with Enhanced Thermoelectric Performance.

Santosh Kumar¹, Manjusha Battabyal², Dillip K Satapathy¹

¹Soft Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India.

ACS Applied Materials & Interfaces

|November 21, 2024

Summary

Researchers developed a flexible thermoelectric film using silver selenide on nylon, achieving record-high performance for wearable green energy generation. This innovative inorganic-organic material demonstrates excellent flexibility and power output for electronic devices.

Keywords:

body-heat harvesting flexible thermoelectric prototype power output printed thermoelectric film thermoelectrics wearable electronics

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Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers

Published on: September 27, 2018

Area of Science:

Materials Science
Energy Harvesting
Nanotechnology

Background:

Flexible thermoelectric devices are crucial for wearable electronics, enabling energy generation from low-grade heat.
Simultaneously achieving high thermoelectric performance and mechanical flexibility in these devices remains a significant challenge.
Inorganic-organic hybrid materials offer a promising avenue for next-generation flexible thermoelectric applications.

Purpose of the Study:

To develop a simple, cost-effective method for fabricating high-performance flexible inorganic-organic thermoelectric films.
To evaluate the thermoelectric properties and mechanical flexibility of the fabricated films.
To demonstrate the potential of these films in practical thermoelectric modules for wearable devices.

Main Methods:

Fabrication of a flexible thermoelectric film by depositing silver selenide (Ag2Se) onto a porous nylon membrane.
Characterization of the thermoelectric performance, including power factor measurements at room temperature.
Assessment of the film's flexibility and performance in a thermoelectric module under varying temperature differences.

Main Results:

The Ag2Se/nylon film achieved an ultrahigh power factor of approximately 3.4 mW/mK² at 300 K, the highest reported for flexible thermoelectric films.
The film demonstrated remarkable mechanical flexibility, maintaining performance when bent.
A thermoelectric module using the film generated 65 mV and 30 μW at a 30 K temperature difference, and produced over 2 mV when wrapped around a human arm.

Conclusions:

The developed Ag2Se/nylon film presents a highly promising solution for high-performance flexible thermoelectric applications.
The simple fabrication method and excellent properties highlight the potential of inorganic-organic films for wearable and implantable green energy harvesting devices.
This work paves the way for advanced flexible electronic systems powered by waste heat.