Perovskite Quantum Dots for Improvement in Efficiency of Perovskite Solar Cells: Recent Advances and Prospects

Abstract Quantum dots (QDs) have emerged as transformative materials for enhancing the performance and stability of perovskite solar cells (PSCs), leveraging their tunable bandgap, energy level alignment, and interfacial engineering capabilities. This review focuses on three critical research frontiers. First, the interfacial defect passivation of QDs represents one of the primary themes of this review. Multifunctional ligands or dopants passivate perovskite surface defects, reducing the trap‐state density and extending the carrier lifetime. Ligand‐engineered QDs also form hydrophobic barriers, improving the device stability. The bandgap tuning and energy level alignment of QDs are critical factors influencing the performance of PSCs. Narrow‐bandgap QDs further enable multiple exciton generation, overcoming the Shockley‐Queisser limit of traditional single‐junction solar cells. In addition, QDs, as multifunctional interlayers, play a pivotal role in enhancing the performance of both single‐junction and tandem solar cells. Future research directions focus on ternary/binary QD compositions for achieving spectral complementarity in tandem cells, bifunctional ligand designs for charge transport, and surface chemistry engineering to integrate defect passivation with ultrafast carrier injection, aiming to obtain PCEs exceeding 25% while addressing stability challenges.