In this study, the team of Professor Ke Weijun and Professor Fang Guoguo from Wuhan University used our company's AC200-SE glue homogenizer, MS450 coating machine, PF200-H perovskite specific coating machine, and PT13M-SE plasma cleaning machine.

Although fully perovskite stacked solar cells (TSCs) have excellent performanceHowever, the efficiency gap between small and large area (>1 cm ²) devices seriously hinders their commercialization process.

Innovation in Crystal ModifiersPiracetam achieves a revolutionary improvement in the quality of wide bandgap perovskite films through a dual mechanism - regulating nucleation to form selectively oriented large grains and annealing to generate one-dimensional nanoneedles for defect passivation.

Breakthrough in stacking efficiencyThe efficiency of the large-area (1.02 cm ²) fully perovskite stacked battery reaches 28.20% (certified 27.30%), with a loss of only 0.51% in area amplification efficiency, breaking the core bottleneck of commercialization.

Universality verificationThe technology can be expanded to 1.56 eV perovskite system, and the efficiency of single junction cells can be improved by 9.1% (23.56% → 25.71%), demonstrating the potential for platform applications.

This study innovatively introduced by Ke Weijun and others from Wuhan UniversityPiracetamAs a wide bandgap perovskite crystal modifier. By regulating the crystal nucleation process through its amide and pyrrolidone groups, a high crystallinity thin film with large grains and (110) preferred orientation is obtained, which reacts with residual PbI ₂ during annealing to form one-dimensional (Pi) PbI Ⅲ nanoneedle structures.

Based on this,The 1.77 eV wide bandgap single junction cell achieves an open circuit voltage of 1.36 V and a certified efficiency of 20.35%;Stacked devices were obtained at an area of 0.07 cm ² and 1.02 cm ², respectively28.71%(Certified 28.13%) and 28.20% (Certified 27.30%) efficiency, with an efficiency loss of only 0.51% when the area is enlarged.This method has strong universality and can increase the efficiency of 1.56 eV perovskite cells from 23.56% to 25.71%, providing a new path for large-scale and efficient all perovskite stacked cells.