# Towards the practical realization of high-performance Ag2Se-based thermoelectric coolers

## TL;DR

Researchers developed Ag2Se-based thermoelectric coolers that can achieve a significant temperature difference, showing promise for practical cooling applications.

## Contribution

The study presents the first practical realization of Ag2Se-based thermoelectric coolers with high performance and stability.

## Key findings

- Ag2Se samples with uniform composition and thermoelectric properties were synthesized.
- Thermoelectric devices achieved a cooling temperature difference of ~56 K at 300 K.
- Ag2Se-based coolers demonstrated superior operational stability.

## Abstract

Ag2Se-based materials with promising room-temperature thermoelectric performance and excellent mechanical properties have been known for decades. However, the fabrication of the Ag2Se-based devices toward the practical application of electronic cooling has seldom been reported. Herein, the synthesis of Ag2Se material with a diameter of 25.4 mm was achieved. The homogeneous elemental distribution and similar thermoelectric properties demonstrate the high uniformity of the Ag2Se sample. In addition, ~90 Ag/Ag2Se/Ag legs can be obtained from a single Ag2Se plate, and the interfacial contact resistivity of the Ag/Ag2Se varies from 0.8 to 3.1 μΩ cm2. Four thermoelectric devices based on n-type Ag2Se and p-type (Bi, Sb)2Te3 have been fabricated, and they achieve a cooling temperature difference of ~56 K at the hot-side temperature of 300 K, demonstrating the great potential of Ag2Se material for cooling applications.

We synthesized Ag2Se samples with homogenous composition and thermoelectric properties, and successfully fabricated high-performance Ag2Se-based thermoelectric coolers with superior operational stability.