The optical properties of the methylammonium lead iodide (CH3NH3PbI3) - Germanium (Ge) heterojunction with a layer of periodical nanoparticles was investigated to achieve broadband light harvesting by 3D Finite Element Method (FEM). The constructed heterojunction device showed a broad bandwidth from 300nm to 1600nm. Under the AM(1.5) illumination, the maximal energy absorbed by the heterojunction device was 776.64W/m2 after optimizing thickness of perovskite and Ge, as well as radius of metallic or dielectric nanospheres (Au, Ag, Al, Si3N4, TiO2, Ta2O5). The improved optical performance was further demonstrated by comparing calculated electric fields and charge carrier generation rates of the optimized heterojunction with periodical nanoparticles layer with that of corresponding flat device.
We propose using the Abbe transform to design binary computer-generated hologram (CGH). We consider the edges of the apertures as the basic diffraction elements and the diffraction pattern of the entire CGH as a coherent summation of all the light diffracted from all the edges. The Abbe transform computes the diffraction of polygonal apertures by the analytical formula with computation time independent of the size of the apertures. We globally optimized the apertures in the CGH using the Genetic Algorithm with local search, followed by an optimization of floating co-vertices of the elementary apertures and obtained high performance CGHs.
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