# Terahertz-Sensitive Diagnosis of Charge Carriers for Thermoelectrics

## TL;DR

This paper discusses how terahertz technology can improve the diagnosis of charge carriers in thermoelectric materials like tin sulfide.

## Contribution

The study introduces a new optical pump–terahertz probe technique for diagnosing carrier dynamics in thermoelectric materials.

## Key findings

- Quadruple-band synglisis enhances thermoelectric efficiency in tin sulfide crystals.
- A terahertz probe technique in reflection mode was developed for carrier transport diagnosis.
- The work bridges thermoelectrics and terahertz technology for complementary development.

## Abstract

This commentary highlights the importance and implications of the study “Quadruple-band synglisis enables high thermoelectric efficiency in earth-abundant tin sulfide crystals”, led by C. Chang and L. Zhao, published in Science. They improved the thermoelectric efficiency by activating quadruple-band synglisis and facilitating carrier transport in tin sulfide crystals, and successfully developed an optical pump–terahertz probe technique in reflection mode to diagnose the carrier dynamics for high-conductivity bulk thermoelectric materials. This study inspires mutual promotion and complementary development between the fields of thermoelectrics and terahertz technology.