Perovskite solar cells from the slot die coater represent a step towards industrial production

• Steel halide perovskites are taken into consideration to be a specifically affordable and also appealing course of products for next-generation solar components. Perovskite solar cells can be produced with finishing processes making use of liquid inks made from forerunner materials and different solvents. After finish, the solvents evaporate as well as the perovskites crystallize to create a more or less homogeneous layer.

Prof. Dr. Eva Unger's team at Helmholtz-Zentrum Berlin has considerable expertise in solution-based handling methods and is exploring alternatives for upscaling.

" Perovskite photovoltaics is the very best solution-processable PV technology readily available," says Eva Unger, "yet we are only just beginning to recognize how the intricate interaction of the solvent components affects the quality of the perovskite layers."

This is since when the halide perovskite layers are covered on large surface areas, undesirable inhomogeneities can take place, as an example so-called ribbing structures.

"By differing the thickness of the ink, such results can be minimized," states Jinzhao Li, who is doing his Ph.D. with Unger. At BESSY II, he has explored just how various solvent combinations influence the formation of the perovskite films.

The best p-i-n-FAPbI3 perovskite solar cells hence accomplish a licensed effectiveness of 22.3 % on a laboratory scale. Jinzhao Li additionally produced small solar components (active location of 12.6 cm2) with colleagues from the HySPRINT advancement laboratory and also PVcomB, which attained efficiencies of around 17 %.

Dr. Carolin Ulbrich's group examined the maximized solar cells at PVcomB's outdoor test facility for a whole year: While doing so, the efficiency stayed virtually steady in wintertime as well as spring, as well as just dropped in the warmer summer months. "These tests of bigger modules under real problems offer us valuable info on deterioration devices to after that more improve the long-term stability of halide perovskite photovoltaics," says Eva Unger.

The paper is published in the journal Advanced Energy Materials.