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New Device May Break the Limit of Photovoltaic Cell Energy Efficiency

Post By : Shenzhen Tcbest Battery Industry Co., Ltd | Date : 2022/3/25 10:14:13 | Hits : 76

Recently, a research team at Kyoto University in Japan has developed a new device that converts heat into light and uses photovoltaic cells to generate electricity, thereby improving energy conversion efficiency.

 

The current theoretical limit of energy conversion efficiency of silicon photovoltaic cells is about 30%, while the conversion efficiency of thermo-optical power generation can theoretically exceed 35%. Thermophotovoltaic power generation, as a new technology that can help realize a decarbonized society, is planned to be put into use in 10 years.

 

The team narrowed the distance between the device's light source and the photovoltaic cells to 140 nanometers, which is shorter than the wavelength of light. A technique of precisely stacking microstructures is used, using 10-micron thin beams to support the light source.

 

Since the light source and the photovoltaic cell are very close to form an integration, the generated light will not be reflected inside the light source and can be transmitted to the photovoltaic cell. In experiments, the team heated the light source to around 1,000°C and found that photovoltaic cells made with indium, gallium and arsenic could get more light.


This achievement goes beyond the so-called blackbody limit. It has been confirmed that the current generated by the photovoltaic cell is about 5 to 10 times that of the conventional thermo-optical power generation device.

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