Optical modeling and active layer design of MASnI₃ perovskite photovoltaics using finite-difference time-domain simulation: from the sun to indoor light

We investigated the optoelectronic effect of MASnI₃ perovskite-based photovoltaics by designing an active layer using the finite-difference time-domain simulation. AM 1.5 G was chosen as the solar light source, set to provide the 400-900 nm wavelength region. As an active layer design method, we controlled the active layer thickness from 20 to 200 nm with a 20 nm step. As the active layer thickness became thicker, J_sc rose sharply and became saturated, and when it was 200 nm, J_sc was highest at 25.64 mA cm⁻². Furthermore, we solved the electric field intensity distribution for each wavelength of light according to the active layer thickness. Finally, by calculating J_sc according to the active layer thickness and generation rate of the optimal device under indoor light sources, we were able to extend our research to indoor applications.