Highly Efficient and Industrially Feasible Interdigitated Back-Contact Perovskite Solar Cells with Front Carrier Transport Layers Selected Using 2D Simulation

Interdigitated back-contact (IBC) perovskite solar cells (PSCs) have great potential for highly efficient and low-cost solar energy conversion. However, their full potential has not been achieved. In particular, there is no practically available front surface and rear contact design for IBC-PSCs as for the conventional crystalline silicon IBCs, which propose challenges in realizing high efficiency. Herein, innovative quasi-interdigitated back-contact (QIBC) PSC designs that enhance the effective lateral transport of carriers are proposed and therefore a realistic wide pitch for back contacting in the range of hundreds of micrometers is allowed. The novel design features implementing an appropriate conductive and well-passivated carrier transport layer, referred to as a front-carrier transport layer (FCTL), on the front surface of the QIBC-PSC. Technology computer-aided design optical/device simulations are used to investigate the function of the FCTL in increasing the cell performance and achieve 23.23% of power conversion efficiency (PCE) after FCTL design optimizations for a QIBC-PSC with a rear contact pitch of 200 mu m. Further improvement of the PCE over 25% can be potentially achievable by improving the film and passivation quality. This work opens up a new approach to fabricate realistic highly efficient IBC-PSCs.