It has a high absorbance and low emissivity and does not need nanofabrication.
which converts the incident light into thermal energy. The major challenge in its adoption is the dissipation of energy while also maintaining high absorption. Current methods of energy harvesting rely on micro or nano-engineering.
Solar energy is transferred as an electromagnetic wave within a broad frequency range. “A good solar-thermal harvester should be able to absorb the wave and get hot, thereby converting solar energy into thermal energy," said Ying Li of Zhejiang University, who was involved in the research. "The process requires a high absorbance , and a solar harvester should also suppress its thermal radiation to preserve the thermal energy, which requires a low thermal emissivity .
This thermal energy harvested by the device can also be converted into electricity using thermoelectric materials. The researchers built a flexible planar solar thermoelectric harvester using the nanoparticles that reached a sustaining voltage of over 20 millivolts per square centimeter. This energy would be sufficient to power 20 LEDs per square meter of solar irradiation, the press release said.
"This highly versatile structure and our fundamental research can be used to explore the upper limit of solar energy harvesting, such as flexible scalable solar thermoelectric generators, which can serve as an assistant solar harvesting component to increase the total efficiency of photovoltaic architectures,” Li added.
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