[18p-P09-1~54] 12.5 Organic and hybrid solar cells

[18p-P09-24] Influence of Heating Time on Anti-solvent-Free Conditions of CsFA Perovskite Layer Using Inkjet Printer

〇Hayato Otsu¹, Tobe Tomoyuki^1,4, Funayama Ryoto³, Shibayama Naoyuki², Ikegami Masashi¹, Miyasaka Tsutomu² (1.Graduate School of Engineering, Toin University of Yokohama, 2.Faculty of Biomedical Engineering, Toin University of Yokohama, 3.Kishu Giken Kogyo, Co. Ltd., 4.KISTEC)

Keywords:

Perovskite Materials,Inkjet method,Oxide semiconductor layer

In the preparation of perovskite layers for perovskite solar cells, a solvent-free process is important not only for safety in the working environment but also for minimizing solvent usage during coating. We are focusing on inkjet methods and conducting research from equipment development to coating solution composition and printing conditions, aiming to achieve perovskite layer preparation without the use of solvents. Our developed inkjet method involves printing the perovskite layer while heating the substrate to over 100°C, thereby avoiding the need for solvents such as chlorobenzene. Initially, precursor solution is ejected from the inkjet head; upon hitting the substrate, the solvent evaporates, and the perovskite layer forms. However, the current method of heating the entire substrate stage results in varying total heating times between the start and end positions of printing. Consequently, differences in heating times vary with different print sizes, highlighting the need for detailed quality control in printing. Starting from a basic 2.5 cm square substrate, we vary patterns to print perovskite solar cells ranging up to the size of a business card. Our focus includes: 1) evaluating crystal formation at the start, intermediate, and end positions of printing; 2) examining total heating times.