Sweden develops thermal drive transistor for thermal imager

According to the consulting report of Mems, the researcher Dan Zhao and Simone Fabiano of the Linkoping University's Organic Electronics Laboratory in Sweden developed the world's first thermoelectric organic transistor, and the temperature can be changed by only one degree. A detectable current modulation is produced in this transistor. Using this transistor, a circuit controlled by the thermal drive of infrared light is manufactured, which can be applied to other applications such as a thermal imager.

"We have developed the world's first transistor logic circuit driven by thermal signals rather than electrical signals," said Professor Xavier Crispin of the Organic Electronics Laboratory at Linköping University.

This thermal drive transistor enables many new applications such as minimal temperature difference detection and functional medical dressings that can monitor the wound healing process.

The thermal sensitivity of this transistor is a hundred times higher than that of conventional thermoelectric materials, which means that it is sufficient to connect the thermosensitive electrolyte (as a sensor) and the transistor circuit only. A sensor combines a thermal drive transistor to create a "smart pixel."

This smart pixel array can replace the current sensor used to detect infrared radiation. With further development, this new technology can create a new type of low-cost thermal imager for smart phones because the materials needed for the technology are neither rare nor expensive, and they are harmless.

The thermal drive transistor is based on a supercapacitor study a year ago that uses solar rays for charging. In this supercapacitor, heat energy is converted into electrical energy and stored in a capacitor for use.

Researchers at the Organic Electronics Laboratory at Linkoping University have explored a variety of conductive polymers to create a liquid electrolyte that has the ability to convert temperature gradients into voltages that are hundreds of times greater than those used in the past. This liquid electrolyte consists of ionic and conductive polymer molecules. Its positive ions are smaller and move faster, while negatively charged polymers are larger and heavier. When one end of the electrolyte is heated, the smaller positive ions move quickly toward the cold end, creating a voltage difference.

"When we confirmed that this capacitor was operational, we began to look for other applications for this new type of electrolyte," said Professor Xavier Crispin.

The research results have been published in the recent "Nature Communications" magazine.

(Original title: The world's first heat-driven transistor promises to create a new low-cost thermal imager for smartphones)

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