Arnaoutakis Georgios E, Marques-Hueso Jose, Ivaturi Aruna, Krämer Karl W, Fischer Stefan, Goldschmidt Jan Christoph, Richards Bryce S
Opt Express. 2014 Mar 10;22 Suppl 2:A452-64. doi: 10.1364/OE.22.00A452.
Concentrating optics are integrated into up-conversion photovoltaic (UC-PV) devices to independently concentrate sub-band-gap photons on the up-conversion layer, without affecting the full solar concentration on the overlying solar cell. The UC-PV devices consist of silicon solar cells optimized for up-conversion, coupled with tapered and parabolic dielectric concentrators, and hexagonal sodium yttrium fluoride (β-NaYF₄) up-converter doped with 25% trivalent erbium (Er³⁺). A normalized external quantum efficiency of 1.75x10⁻² cm²/W and 3.38x10⁻² cm²/W was obtained for the UC-PV device utilizing tapered and parabolic concentrators respectively. Although low to moderate concentration was shown to maximize UC, higher concentration lead to saturation and reduced external quantum efficiency. The presented work highlights some of the implications associated with the development of UC-PV devices and designates a substantial step for integration in concentrating PV.
聚光光学器件被集成到上转换光伏（UC-PV）器件中，以便在不影响覆盖其上的太阳能电池的全太阳能聚光的情况下，将子带隙光子独立地聚光到上转换层上。UC-PV器件由针对上转换进行优化的硅太阳能电池、与锥形和抛物线形介电聚光器以及掺杂25%三价铒（Er³⁺）的六方氟化钇钠（β-NaYF₄）上转换器组成。分别使用锥形和抛物线形聚光器的UC-PV器件的归一化外量子效率分别为1.75×10⁻² cm²/W和3.38×10⁻² cm²/W。虽然低至中等聚光被证明能使上转换最大化，但更高的聚光会导致饱和并降低外量子效率。所展示的工作突出了与UC-PV器件开发相关的一些影响，并为其在聚光光伏中的集成指明了重要的一步。
