Toward Perovskite Nanocrystalline Solar Cells: Progress and Potential
WWith the flourishing development of perovskite nanocrystals (NCs), there has been a significant increase in photoelectronic conversion efficiency for perovskite nanocrystalline solar cells in the last five years. The variable band gap and superior phase stability of perovskite NCs are desirable for photovoltaic applications. Well-performing open-circuit voltage of these devices has been reported, approaching 85% of their theoretical limits. However, short carrier lifetime and high interface recombination jointly limit the short-circuit currents and fill factors of the devices. This review aims at presenting a description of the fundamentals, recent progress, and perspectives of perovskite nanocrystalline solar cells, with the focus of improving the stability of high-performance devices. Challenges and strategies concerning the surface passivation of perovskite NCs and films are discussed. Besides, we provides an extensive overview of the latest cutting-edge research to promote charge transport and extraction, focusing on the energy band alignment of perovskite absorber, charge transport layer and the interface layer. Device architectures for improving the device performance are described, including tandem solar cells and gradient-bandgap multilayer solar cells. Finally, perspectives and undergoing efforts for further development of perovskite nanocrystalline solar cells are presented.
- This article is part of the themed collection: Journal of Materials Chemistry C Recent Review Articles