Advantages Optical rectenna

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one of biggest claimed advantages of optical rectennas high theoretical efficiency. when compared theoretical efficiency of single junction solar cells (30%), optical rectennas appear have significant advantage. however, 2 efficiencies calculated using different assumptions. assumptions involved in rectenna calculation based on application of carnot efficiency of solar collectors. carnot efficiency, η, given by



where tcold temperature of cooler body , thot temperature of warmer body. in order there efficient energy conversion, temperature difference between 2 bodies must significant. r. l. bailey claims rectennas not limited carnot efficiency, whereas photovoltaics are. however, not provide argument claim. furthermore, when same assumptions used obtain 85% theoretical efficiency rectennas applied single junction solar cells, theoretical efficiency of single junction solar cells greater 85%.


the apparent advantage optical rectennas have on semiconductor photovoltaics rectenna arrays can designed absorb frequency of light. resonant frequency of optical antenna can selected varying length. advantage on semiconductor photovoltaics, because in order absorb different wavelengths of light, different band gaps needed. in order vary band gap, semiconductor must alloyed or different semiconductor must used altogether.








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