Presentation Information
[17p-M_124-1]Vacuum technology improves the uniformity of wide-bandgap perovskite films
〇Huan BI1, Qing Shen1, Shuzi Hayase1 (1.UEC)
Keywords:
Wide-bandgap perovskites,Vacuum-assisted processing,Phase uniformity
Wide-bandgap (WBG) perovskite solar cells are essential components for high-efficiency tandem photovoltaics. However, achieving high-quality WBG films remains a challenge due to the complex crystallization kinetics of mixed-halide compositions, which often lead to phase segregation and non-uniform film morphology. These inhomogeneities serve as recombination centers, significantly limiting the open-circuit voltage (Voc) and overall device stability.1,2
In this work, we demonstrate that the integration of vacuum technology during the film fabrication process substantially improves the structural and compositional uniformity of WBG perovskite layers. By controlling the solvent evaporation rate through a vacuum-assisted quenching approach, we effectively suppressed the formation of detrimental impurity phases. X-ray Photoelectron Spectroscopy (XPS) depth profiling and surface analysis confirm a significantly more homogeneous distribution of elements and a reduction in phase separation compared to conventionally processed films.
This enhanced phase uniformity translates directly to superior device performance, characterized by reduced non-radiative recombination and improved charge carrier extraction. Our findings provide a robust strategy for scaling up high-performance WBG perovskites and underscore the critical role of vacuum processing in managing the crystallization of multi-component perovskite systems for next-generation tandem solar cells.
In this work, we demonstrate that the integration of vacuum technology during the film fabrication process substantially improves the structural and compositional uniformity of WBG perovskite layers. By controlling the solvent evaporation rate through a vacuum-assisted quenching approach, we effectively suppressed the formation of detrimental impurity phases. X-ray Photoelectron Spectroscopy (XPS) depth profiling and surface analysis confirm a significantly more homogeneous distribution of elements and a reduction in phase separation compared to conventionally processed films.
This enhanced phase uniformity translates directly to superior device performance, characterized by reduced non-radiative recombination and improved charge carrier extraction. Our findings provide a robust strategy for scaling up high-performance WBG perovskites and underscore the critical role of vacuum processing in managing the crystallization of multi-component perovskite systems for next-generation tandem solar cells.