title: Pyramidal surface textures for light trapping and antireflection in perovskite-on-silicon tandem solar cells.
abstract: Perovskite-on-silicon tandem solar cells show potential to reach > 30% conversion efficiency, but require careful optical control. We introduce here an effective light-management scheme based on the established pyramidal texturing of crystalline silicon cells. Calculations show that conformal deposition of a thin film perovskite solar cell directly onto the textured front surface of a high efficiency silicon cell can yield front surface reflection losses as low as 0.52mA/cm(2). Combining this with a wavelength-selective intermediate reflector between the cells additionally provides effective light-trapping in the high-bandgap top cell, resulting in calculated absolute efficiency gains of 2 - 4%. This approach provides a practical and effective method to adapt existing high efficiency silicon cell designs for use in tandem cells, with conversion efficiencies approaching 35%.
authors.forename: Bennett W
authors.initials: BW
authors.lastname: Schneider
authors.forename: Niraj N
authors.initials: NN
authors.lastname: Lal
authors.forename: Simeon
authors.initials: S
authors.lastname: Baker-Finch
authors.forename: Thomas P
authors.initials: TP
authors.lastname: White
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry* / Q000528:radiation effects; D003198:Computer Simulation; D017076:Computer-Aided Design; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008027:Light; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry* / Q000528:radiation effects; D012031:Refractometry / Q000295:instrumentation; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D014025:Titanium; D012825:Silicon