Enhancing Performance of NiOx-Based Inverted Perovskite Solar Cells: Advances in Buried Interface Material Modification Strategy

Inverted perovskite solar cells (PSCs) have become a current research hotspot due to their advantages such as low-temperature preparation, low hysteresis, and compatibility with stacked other cells. NiOx, as a metal oxide hole transport layer material, is widely used in inverted PSCs. However, challenges such as high defect density, low intrinsic conductivity, and unfavorable valence band mismatch at the NiOx/perovskite interface hinder further improvement of device performance. Therefore, enhancing the buried interface between NiOx and perovskite layers is crucial for optimizing performance. This review systematically categorizes materials based on their types, including organic small molecules, self-assembled monolayers (SAMs), polymers, and salts. Additionally, it incorporates other strategies, such as the introduction of low-dimensional materials, metal doping, and advancements in NiOx deposition technology. By reviewing the materials and technologies used in the past 2 years, this article aims to provide insights for enhancing the buried interface to achieve more efficient and stable NiOx-based PSCs. Finally, we also discuss future directions and challenges.