Bilateral Interface Engineering for Efficient and Stable Perovskite Solar Cells Using Phenylethylammonium Iodide
Yuanyuan Zhang, Soyeong Jang, In‐Wook Hwang, Yun Kyung Jung, Bo Ram Lee, Joo Hyun Kim, Kwang Ho Kim, Sung Heum Park
Abstract
perovskite layers, which decreases the energy loss during charge transfer. Additionally, depositing PEAI onto three-dimensional (3D) perovskite yields a two-dimensional/three-dimensional (2D/3D) stacked structure for the perovskite active layer. Because the two-dimensional (2D) top layer acts as a capping layer to prevent water penetration, the stability of the perovskite active layer is significantly enhanced. A PeSC device fabricated based on this combination exhibits enhanced power conversion efficiency (PCE) and an extended device lifetime compared to a pristine PeSC. Under high-humidity conditions (75 ± 5%), the PEAI-treated PeSC retains 88% of its initial power conversion efficiency (PCE) after 100 h. In contrast, a pristine PeSC device loses over 99% of its initial PCE after only 25 h under the same conditions.