11. The use of primary energy as a measure ignores conversion efficiency . 12. Under experimental conditions, microwave conversion efficiency was measured to be around 54 %. 13. Usually, the conversion efficiency is not high for the transmission-type metasurface. 14. This would lead to beam walk-off, which limits the nonlinear optical conversion efficiency . 15. That allows the achievement of the maximal energy conversion efficiency to the UV radiation. 16. These polymers have a large strain, elastic energy density, and high energy conversion efficiency . 17. Recently, in August 2014, First Solar announced a device with 21.1 % conversion efficiency . 18. Conversion efficiency falls very rapidly when the engine is operated outside of this band.19. The best tandem cell I've seen had a conversion efficiency of about 30 %. 20. Solar cell energy conversion efficiencies for commercially available photovoltaics are around 14 22 %.
