Unveil the Full Potential of Integrated-Back-Contact Perovskite Solar Cells Using Numerical Simulation

The technologies of perovskite solar cells (PSCs) have been developing rapidly. After 8 years of research, the quantum efficiency of PSCs based on the planar sandwich structure has been approaching 100% in the visible light region. In order to further improve the performance of PSCs, adopting an integrated-back-contact (IBC) structure, which is expected to be able to reduce light loss, to the PSCs is a promising option. In this work, a numerical simulation method is, for the first time, used to verify the applicability of the IBC structure to PSCs. We have investigated the factors that may affect the power conversion efficiency of the IBC-PSCs, to demonstrate that IBC-PSCs are advantageous over the traditional sandwich PSCs when we use small contact width (≤5 μm) of the IBC-PSCs and reported characteristics of perovskite films (mobility ≥ 10 cm² V^-1 s^-1, lifetime ≥ 1 μs) in the simulation. By optimizing the properties of perovskite films, we can fabricate IBC-PSCs with 11% of improved performance over that of the sandwich-type PSCs. The present results provide guidelines for the design and fabrication of highly efficient IBC-PSCs.