31 October 2016 The research of multi-alkali vacuum photodiode on heating and illuminating
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Abstract
A novel concept for solar cell technology, photon-enhanced thermionic emission (PETE), was proposed for harvesting photonic and thermionic energy simultaneously. Researches show that the conversion efficiency of PETE is pretty high, calculated efficiencies for idealized devices can be above 50%, which is exceed the theoretical limits of single-junction photovoltaic cells. To explore whether the vacuum device can exhibit good performance under the conditions that combines illumination and heating, a multi-alkali vacuum photodiode is used as a quantum and thermal energy converter. The band gap of multi-alkali cathode is 1.1eV and the multi-alkali photocathode is employed at temperature below 350K.The current-voltage characteristic curve is measured under two different temperature conditions, so is the power-voltage curve. And the conversion efficiency of the multi-alkali vacuum photodiode is also calculated on the basis of experiment data. The experiment results show that the power converted by a heated and illuminated condition is greater than that obtained under illumination at room temperature or heating without illumination. The conversion efficiency of the multi-alkali vacuum photodiode is higher than that not be heated. This paper shows that the multi-alkali vacuum device presents better performance under the combined conditions. Although the power production and conversion efficiency are not very high in this research, the experiment demonstrates how the two forms of quantum and thermal of solar energy can be simultaneously utilized.
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Rongguo Fu, Liu Yang, Guiyuan Wang, Yifang Wei, Kun Wang, "The research of multi-alkali vacuum photodiode on heating and illuminating", Proc. SPIE 10019, Optoelectronic Devices and Integration VI, 1001918 (31 October 2016); doi: 10.1117/12.2245549; https://doi.org/10.1117/12.2245549
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