Wang, Zhen Kuk, Seungkuk Kang, Byungsoo Lee, Phillip Jeong, Jeung-Hyun Hwang, David J. 2024-01-19T18:01:55Z 2024-01-19T18:01:55Z 2021-09-05 2020-03-01 0169-4332 https://pubs.kist.re.kr/handle/201004/118868 Perovskite solar cells (PSC) have attracted attention by their unprecedented rise in device efficiency. However, the PSCs were mostly tested for the unit cells of small area, and it is important to upscale to solar modules. Laser scribing has great potential to this end. However, the key challenge identified in one-step P2 laser scribing is to remove film stack including the hole block layer (HBL) without damaging transparent conducing oxide (TCO) based bottom contact and thus to provide interconnecting paths with minimized contact resistance. In this study, we evaluate one-step P2 scribing performance of picosecond laser of 532 nm wavelength for mesoscopic perovskite architecture with the c-TiO2 (compact TiO2) as the HBL and fluorine doped fin oxide (FTO) as bottom contact. Despite anticipated challenge of low absorption selectivity, c-TiO2 layer could be efficiently removed without FTO damage over wide processing window enabling a self-terminating mechanism. Detailed parametric studies elucidate relevant scribing mechanisms such as layer-by-layer ablation mechanism or lift-off mechanism depending laser illumination direction. It is also revealed that the removal of c-TiO2 is triggered by ablation of upper layers, in particular, the mesoporous TiO2. Module level test is under way in conjunction with investigation of further scribing mechanisms. English ELSEVIER HOLE-TRANSPORTING MATERIAL MODULES LENGTHS LIGHT PHOTOVOLTAICS PERFORMANCE EFFICIENCY LAYER One-step P2 scribing of organometal halide perovskite solar cells by picosecond laser of visible wavelength Article 10.1016/j.apsusc.2019.144408 1 APPLIED SURFACE SCIENCE, v.505 APPLIED SURFACE SCIENCE 505 scie scopus 000510846500042 2-s2.0-85078676642 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article HOLE-TRANSPORTING MATERIAL MODULES LENGTHS LIGHT PHOTOVOLTAICS PERFORMANCE EFFICIENCY LAYER Perovskite thin film solar cell Laser scribing Picosecond laser P2 scribing