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

[18p-P09-41] Investigation of Spin-Coating Conditions for Perovskite Layer Preparation on ITO-PET Films Patterned by 355 nm Laser Marker

〇Nao Saito¹, Tomoyuki Tobe^1,3, Masashi Ikegami¹, Tsutomu Miyasaka^2,4, Yoshihiko Suda⁴ (1.Graduate School of Engineering, Toin Univ., 2.Faculty of Biomedical Engineering, Toin Univ., 3.KISTEC, 4.Peccell Technologies, Inc.)

Keywords:

Spin coating method,ITO-PET,Patterning

For practical testing of barrier films in perovskite solar cells and demonstration of small-scale devices, our laboratory is primarily advancing fabrication of approximately 7 x 7 cm², 6-series devices using inkjet and spin-coating methods. When utilizing the spin-coating method with the standard anti-solvent technique for perovskite layer coating, we observed significant effects on film formation on patterned ITO-coated substrates, particularly in areas where the ITO patterning was removed. These effects are attributed to variations in the wettability between the ITO surface and the ITO-removed surface, which were treated with UV ozone treatment.
To increase the aperture ratio by narrowing the width of the ITO removal, patterning was performed using a 355 nm laser marker. We conducted patterning on ITO-PET films with sheet resistance below 15 Ω and on ITO-PET films with a TiO₂ buffer layer (~7 nm thick) using the 355 nm laser marker. Around the removal lines of ITO-PET films with the TiO₂ buffer layer, surface irregularities reached up to 3 µm, compared to the 300 nm depth of ITO removal. This highlights the significant impact of TiO₂ buffer layer absorption.