University of Rochester boosts solar thermoelectric generator power by 15 times

Researchers at the University of Rochester have developed a new method to significantly boost the power generation of solar thermoelectric generators. The team achieved a fifteen-fold increase in efficiency compared to earlier designs. This breakthrough relies on advanced thermal management rather than altering the semiconductor materials themselves.

Advanced thermal management enables fifteen-fold efficiency increase without changing materials

The improved device absorbs more than 80 percent of sunlight at high temperatures using a selective solar absorber created via femtosecond laser processing. A plastic chamber utilizes a greenhouse effect to reduce heat loss from convection by more than 40 percent. On the cold side, a micro-structured heat dissipator doubles the cooling performance of a normal aluminum heat sink. These changes result in a 25 percent increase in device weight while delivering substantial gains in power output.

Chunlei Guo, a lead researcher on the project, explained that the study focused on the hot and cold sides of the device instead of the semiconductor materials. He noted that the research community has made modest gains in efficiency for decades by focusing on materials. The new approach combines better solar energy absorption and heat trapping at the hot side with better heat dissipation at the cold side. Guo stated that this combination led to an astonishing improvement in efficiency.

The researchers demonstrated that the improved generators can power LEDs much more effectively than current devices. Guo indicated that the technology holds potential for wireless sensor networks, wearable electronics, and medical sensors. The findings were published in the journal Light: Science and Applications. The University of Rochester has not confirmed a commercial launch window for this technology.