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

Epitaxialgrowth technology has garnered widespread attention inthe field of perovskite solar cells for its potential to produce high-qualitycrystals with preferred orientations and superior photoelectric properties.However, achieving rational epitaxial growth in the fabrication processof perovskite solar cells still remains a challenging task. A thoroughunderstanding of the fundamental principles of epitaxial growth andan appreciation of the unique advantages of the main epitaxial strategiesare crucial for the effective application of this technique in therealm of metal halide perovskites. Unfortunately, due to the lackof a comprehensive summary of the epitaxial metal halide perovskitesolar cells, current researchers have insufficiently explored theapplication of epitaxial growth methods, leading to a limited understandingof the underlying principles and immature process development. Therefore,this review systematically summarizes the principle of epitaxial growthtechnologies, the main epitaxial strategies, and the latest researchprogresses in its application to perovskite solar cells, aiming toassist readers in better understanding and applying this techniquein the context of perovskite solar cells.