Scientist advance slot-die coated perovskite solar cells and also ink properties

• Researchers from Germany's Helmholtz-Zentrum Berlin (HZB) and also HTW Berlin have taken a look at exactly how precursor inks influence the quality of perovskite thin films. The best cells were scaled approximately minimodule dimension. The team revealed that when slot-die covering the halide perovskite layers on large locations, ribbing results may occur yet can be protected against by adjusting the precursor ink's rheological properties.

Prof. Dr. Eva Unger's team at Helmholtz-Zentrum Berlin has extensive expertise in solution-based handling techniques and also is investigating options for upscaling. "Perovskite photovoltaics is the very best solution-processable PV innovation available," says Eva Unger, "yet we are only just starting to comprehend just how the intricate communication of the solvent elements affects the quality of the perovskite layers."

When halide perovskite layers are coated on huge surface areas, unwanted inhomogeneities can occur, as an example so-called ribbing frameworks. "By differing the viscosity of the ink, such impacts can be decreased," says Jinzhao Li, who is doing his PhD with Unger. At BESSY II, he has checked out just how various solvent combinations affect the formation of the perovskite films. The best p-i-n-FAPbI3 perovskite solar cells therefore achieve a qualified efficiency of 22.3% on a lab scale. Jinzhao Li likewise generated small solar modules (energetic location of 12.6 cm2) with coworkers from the HySPRINT technology lab as well as PVcomB, which attained performances of around 17 %.

Dr. Carolin Ulbrich's team tested the maximized solar cells at PVcomB's outdoor examination center for a whole year: At the same time, the effectiveness remained almost stable in wintertime as well as springtime, and also only dropped in the warmer summer season. "These examinations of larger modules under real conditions give us valuable info on destruction mechanisms to after that further improve the long-term stability of halide perovskite photovoltaics," claims Eva Unger.

This work highlights the significance of the real-condition assessment of bigger area device models to validate the technological capacity of halide perovskite photovoltaics.