Flexible Semiconductor for Thermoelectric Generation

A groundbreaking discovery by researchers in Australia has unveiled a new material with the potential to revolutionize the field of wearable technology. This innovative material, identified by the team at the Queensland University of Technology, serves as a flexible semiconductor capable of harnessing thermal energy to generate power. By focusing on manipulating the spaces between atoms in crystals, the researchers have developed an alloy known as AgCu(Te, Se, S), composed of silver, copper, tellurium, selenium, and sulphur.

Utilizing vacancy engineering within the crystal structure, the team has successfully enhanced the mechanical, electrical, and thermal properties of the material. Through a cost-effective melting method that allows precise control of atomic vacancies, a flexible AgCu(Te, Se, S) semiconductor was synthesized. This breakthrough paves the way for the creation of innovative micro-flexible devices that can be seamlessly integrated into wearable electronics.

Lead researcher Nanhai Li emphasized the significance of thermoelectric materials in converting heat into electricity efficiently and sustainably. The human body, as a continuous source of heat, presents an ideal environment for harnessing thermal energy. By leveraging the temperature differential between the body and the surroundings, the newly developed semiconductor demonstrates remarkable power generation capabilities.

Combining the ductile p-type (AgCu)0.998Te0.8Se0.1S0.1 with a commercial n-type Bi2Te3, the researchers achieved a notable power density of approximately 126 μW cm−2 under a 25-degree temperature gradient. This remarkable performance underscores the immense potential of the material for powering wearable electronics and other portable devices.

Professor Zhi-Gang Chen, who spearheaded the research, highlighted the importance of exploring diverse avenues in flexible thermoelectric technology. While current devices predominantly rely on inorganic thin-film or organic thermoelectric materials, the newly discovered semiconductor offers a unique blend of flexibility and performance. By delving into the underlying physics and chemistry mechanisms, the team aims to unlock the full potential of this rare inorganic material for future applications.