Forward scattering of dielectric nanoparticle arrays for light trapping in thin film photovoltaics

초록

We investigate how the forward scattering of a dielectric nanoparticle array (NPA) affects the absorption in a perovskite semiconductor by increasing an optical path length. Both diameter and fill factor of the NPA are optimized, and 15.4 mA/cm2 of Jsc is obtained from a 200 nm-thick perovskite film, which can be improved by 56.5% with the TiO2 NPA with a diameter of 420 nm and a fill factor of 0.65 yielding 24.1 mA/cm2 of Jsc. Moreover, the multipole expansion is performed to study the contribution of multipole resonances, and the influence of the surrounding medium on the scattering is explored.