Effect of Shapes of Metallic Nanoparticles on Forward Scattering Characteristics in Organic Semiconductors in Photovoltaics

초록

We investigate how a shape of metallic nanoparticles affects forward scattering characteristics in a hole transporting layer of perovskite solar cells. It is found that a silver (Ag) prism shape in poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) presents a strong forward scattering efficiency resulting from the excitation of a localized surface plasmon resonance when an electric dipole and a quadrupole are in phase with a relatively small size parameter (a/λ) as compared to a Ag sphere in PEDOT:PSS. The wavelength that shows a maximum scattering efficiency can be readily tuned by varying the geometry of the metallic nanoparticles or altering the materials. This study may provide greater flexibilities in designing the solar cell structure, in particular a buffer layer, to achieve a greatly improved absorption in a photoactive layer by the forward scattering.