2D/3D Heterojunction for Highly Efficient Tin-Lead Alloyed Perovskite Solar Cells

作者：Ting Zhang, Tianyu Lan, Fei Xie, Bofeng Yang, Jian Li, Shibin Li · 年份：2023 · DOI：10.1109/imws-amp57814.2023.10380977 · 被引用次数：1 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Quantum Dots Synthesis And Properties

Despite remarkable progress has been made in tin-lead alloyed perovskite solar cells (PSCs), the power conversion efficiency (PCE) is still lower than their Pb-based counterparts, which might be ascribed to its poor film-forming morphology and easy oxidation of Sn2+ at the surface. Herein, we report a 2D/3D heterojunction to improve the film morphology during the film crystal growth via facile ammonium additive in precursors, thus preventing Sn2+ oxidation in the final perovskite. As a result, the hetero-structured solar cells achieved a high PCE of 17.56% with a high$V_{oc}$of 0.81 V. In addition, the unsealed hetero-structured solar cell device maintained its initial PCE of approximately 86 % after storage in a nitrogen atmosphere for one month, in comparison to that the control device (maintaining 30% of its initial value).