A large class of photoelectrodes for water splitting are processed by assembling nanoparticles onto a silicon solar cell substrate. A fundamental question is the optimal size of constituent nanoparticles that maximizes optical absorption in the photoanode. We use electromagnetic optical calculations to study the impact of particle size on optical absorption of Ta 3 N 5 /Si tandem photoanodes. We found that optical absorption efficiency dramatically increases when particle support Mie resonances, independent of particle shape. Subsequently, monolayers of resonant-size particulate and thin films of Ta 3 N 5 on silicon substrate are studied. Ta 3 N 5 limits overall performance of Ta 3 N 5 /Si tandem device in both devices with the particulate one showing better performance. We take into account material charge transport properties and conditions of imperfect surface coverage of Si solar cell with Ta 3

中文翻译：

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薄膜形貌对水分解中Ta 3 N 5 / Si微粒阳极中光吸收影响的计算研究

通过将纳米颗粒组装到硅太阳能电池基板上，可以处理用于水分解的大量光电电极。一个基本问题是组成纳米颗粒的最佳尺寸，该尺寸可使光阳极中的光吸收最大化。我们使用电磁光学计算来研究粒径对Ta 3 N 5 / Si串联光电阳极的光吸收的影响。我们发现，当颗粒支持米氏共振时，与颗粒形状无关，光吸收效率会大大提高。随后，研究了谐振尺寸的微粒单层和Ta 3 N 5在硅基板上的薄膜。Ta 3 N 5限制了这两种装置中Ta 3 N 5 / Si串联装置的整体性能，其中微粒显示出更好的性能。