Impact and Role of Epitaxial Growth in Metal Halide Perovskite Solar Cells

Epitaxial growth technology has garnered widespread attention in the field of perovskite solar cells for its potential to produce high-quality crystals with preferred orientations and superior photoelectric properties. However, achieving rational epitaxial growth in the fabrication process of perovskite solar cells still remains a challenging task. A thorough understanding of the fundamental principles of epitaxial growth and an appreciation of the unique advantages of the main epitaxial strategies are crucial for the effective application of this technique in the realm of metal halide perovskites. Unfortunately, due to the lack of a comprehensive summary of the epitaxial metal halide perovskite solar cells, current researchers have insufficiently explored the application of epitaxial growth methods, leading to a limited understanding of the underlying principles and immature process development. Therefore, this review systematically summarizes the principle of epitaxial growth technologies, the main epitaxial strategies, and the latest research progresses in its application to perovskite solar cells, aiming to assist readers in better understanding and applying this technique in the context of perovskite solar cells.