Edge passivation: Considerable improvement in photovoltaic performance of perovskite/silicon tandem solar cells.

This article focuses on addressing edge recombination losses in perovskite/silicon (PK/Si) tandem solar cells, a challenge that hinders their commercialization and efficiency. It proposes a low-temperature, non-vacuum liquid-based edge passivation strategy (LEPS) using the organic polymer Nafion to effectively reduce edge defects, thereby enhancing the minority carrier lifetime and improving power conversion efficiency (PCE). Application of LEPS increased the open circuit voltage and PCE of PK/Si tandem cells by up to 3.8% absolute and 1.2% absolute, respectively, achieving a champion PCE of 29.48% in a monolithic tandem cell. The study demonstrates that LEPS offers a simple, cost-effective method to mitigate edge losses in small-area PK/Si tandem solar cells, supporting their industrial scalability and long-term stability under encapsulation.