[5p-PA3-1~46] 12.5 Organic solar cells

[5p-PA3-25] Influence of droplet size parameter on perovskite layer coated by inkjet printing method

〇(M1)Tomoyuki Tobe¹, Hideki Iwahashi², Akito Endo², Yoshitaka Sanehira¹, Youhei Numata¹, Masashi Ikegami¹, Tsutomu Miyasaka¹ (1.Toin Univ. of Yokohama, 2.Kishu Giken Kogyo)

Keywords:perovskite solar cell, inkjet printing method

Organic / inorganic hybrid perovskite solar cells have attracted a great deal of attention in recent years due to the high energy conversion efficiency exceeding 20% prepared by simple-solution processes. For practical application, a technique to uniformly apply the provskite film in a large area is required. Slot die coating, doctor blade coating, etc. have been reported as such attempts. Since one of the advantages of perovskite solar cell is its active layer formation by solution coating, it is desired that a photoelectrode can be formed in an arbitrary shape. From this point of view, an inkjet printing method capable of switching injection by ON / OFF from a computer would be a suitable method. Although there have been reports on film formation of perovskite by the inkjet method, there are many problems from the balance of throughput and energy conversion efficiency for module size film formation. Therefore, we investigated coating conditions such as concentrations of precursor solution, a size of liquid droplet coming out from a nozzle, and printing pitch for making high efficient solar cells by highly throughput inkjet printing.
Kishu Giken Kogyo Co., Ltd. WM 5000 was used as an ink jet printer. CH3NH3PbI3 / DMF solution was used as a coating solution, which was prepared by diluting the solution usually used in spin coating method by 10 times. When the size of droplet from the nozzle was 60 μm, the surface of coating surface was very rough because of taking much time to be dried with spreading out. Compared with the droplet size of 60 μm, the size of 20 μm was advantageous for forming a uniform film.