[20a-PB2-1~59] 12.5 Organic solar cells

[20a-PB2-14] Experimental study of the antisolvent crystallization process of metal halide perovskite layers using DC motor controlled micropipette in spin coating

〇Wataru Narita¹, Masashi Ikegami¹, Tsutomu Miyasaka¹ (1.Toin Univ. of Yokohama)

Keywords:perovskite solar cell, anti-solvent method, spin coating

High energy conversion efficiency of the lead halide perovskite solar cells are of an immense current research interest. .It is due to the fact that the simple solution process can be utilized for the fabrication of the perovskite solar cells. Usually, a spin coater is used to fabricate the perovskite thin film with a thickness of less than 1 um and a good quality of the film can be fabricated by an anti-solvent method using chlorobenzene or toluene, in which the solubility of perovskite is too low. This anti-solvent method is that several hundred uL of the chlorobenzene and toluene are poured on the substrate during spin coating of the perovskite precursor solution during spinning at a certain time and at a certain speed by a micropipette. Therefore, one of the problems of the antisolvent method strongly depends on the person. From such a background, we have been trying to make an auto equipment for pushing a micropipette during spin coating, controlled by PC or some other external devices.
In this study, we attempted to measure the experimental parameters poring anti-solvent using micropipette operated by DC motor. Using this setup, we can measure pressure and speed of pushing micropipette, timing, distance between pipette tip, and other parameters of the substrate. Using these parameters, we will attempt to make an auto-micropipette equipment operated by computer or the external devices.