One-stone-two-birds: over 26% efficiency in perovskite solar cells via synergistic crystallization & interface regulation

Abstract

Organic–inorganic hybrid perovskites have emerged as promising photovoltaic materials due to their excellent photoelectronic properties and low-cost fabrication techniques. However, the performance and stability of perovskite solar cells (PSCs) are compromised by the random orientation of optically active phase crystals and bulk/interface defects. In this paper, we developed a multifunctional organic material, parabanic acid, to regulate the crystallization and realize full-range defect passivation integrated passivation of defects in perovskites. Attributed to the synergistic effect of functional groups, perovskite films with concentrated out-of-plane spatial orientation were formed. In addition, the introduction of an interface passivation layer based on parabanic acid achieved integrated passivation of bulk and interface defects in perovskite solar cells. The resulting PSCs achieved a power conversion efficiency of 26.03% (certified 25.51%) with excellent environmental stability. Notably, under standard measurement conditions (ISOS-L-1I), the maximum power point output maintained 96.3% of its initial efficiency over 2000 hours. The synergistic regulation of crystal orientation and integrated passivation of defects provide a new approach to promote the development of perovskite solar cells.