Performance research of perovskite solar cell with light conversion electron transport layer utilizing prism scattered lights

Abstract

TiO2 conversion luminescent materials doped with Er3+ and Yb3+ are used as electron transport layer to enhance photoelectric performance of CH3NH3PbI3 perovskite solar cells (MAPbI3 PSC) under scattered solar light irradiation by prism. The composition, morphology and optical property of the films were characterized by XRD, XPS, SEM, UV–vis and PL. The up-conversion TiO2 luminescent film absorbs multiple low energy infrared photons and converts them into one visible photon, while the down-conversion TiO2 luminescent film absorbs one high-energy ultraviolet photon and converts it into multiple visible photons. The obtained visible photons can effectively excite the MAPbI3 perovskite to produce more photo-generated electron-hole pairs, thus improving the incident light utilization and power conversion efficiency (PCE) of MAPbI3 PSC. The MAPbI3 PSC with up-conversion TiO2, TiO2 and down-conversion TiO2 electron transport layer (UTD-MAPbI3 PSC) can effectively utilize the infrared, visible and ultraviolet lights obtained from the sunlight dispersed by a prism, respectively. Under the scattered solar light irradiation, the PCE of UTD-MAPbI3 PSC is increased by 11.22%, compared with that of the MAPbI3 PSC with un-doped TiO2 as the electron transport layer (TiO2-MAPbI3 PSC). This may provide a new idea to enhance the utilization ratio of sunlight for solar cells.