In today’s energy-transition scenario, the pursuit of efficient, cost-effective, and environmentally sustainable strategies to harvest renewable energy is accelerating. Solar cells are a promising solution for sustainable energy production, offering efficient photovoltaic energy conversion. Among these, perovskite solar cells have gathered significant attention due to their high efficiency and low-cost fabrication processes. However, the practical application and marketability of perovskite solar cells are limited by their scalability and long term stability. In their operation, interfaces between perovskite and adjacent charge transport layers are crucial components for improving both efficiency and stability of perovskite solar cells. Reactions between perovskite and transport layers significantly affect the device stability, while defects presented at the interfaces increase charge recombination possibilities which consequently deteriorates the final power conversion efficiency of the device.