Plasmon Nanoparticle Effect To Improve Optical Properties Of Perovskite Thin Film

Noble metal material, size, period and position are key parameters to affect optical absorption property of perovskite thin film, which was numerically investigated in this paper by finite element method. It demonstrates that Al nanoparticles show larger enhancement ability of light absorption than that of Au and Ag under AM1.5 illumination with the same geometry parameter. The light absorption enhancement after introducing Al nanopheres is optimized by nanosphere size, period and position being placed either on top (case I), in perovskite layer (case II), or simultaneously on top and in perovskite layer (case III), which mechanism isdiscussed in terms of the corresponding electric field and power loss density distributions. The maximal light absorption enhancement is revealed to-1.41 fold that of without Al nanosphere case. The SiO2, Al2O3 and TiO2 dielectric-nanoshell encapsulating effects on incident light trapping ability and photocurrent of the above optimized case are discussed as well. The present work holds great promise for choosing appropriate plasmonic material, size, period and position to facilitate designing perovskite solar cells and photo detectors.