Slot die coated planar perovskite solar cells via blowing and heating assisted one step deposition

• Published in: Solar energy materials and solar cells 2018-06, Vol.179, p.80-86
• Main Authors: Kim, Jueng-Eun, Jung, Yen-Sook, Heo, Youn-Jung, Hwang, Kyeongil, Qin, Tianshi, Kim, Dong-Yu, Vak, Doojin
• Format: Article
• Language: English
• Subjects: Blowing; Coatings; Conversion coating; Crystals; Deposition; Drying; Energy conversion efficiency; Heating; Hot deposition; Morphology; Perovskite; Perovskite PV; Perovskites; Photovoltaic cells; Printed solar cells; Roll-to-roll printing; Scalable process; Slot die coating; Slot dies; Solar cells; Solar energy; Spin coating
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2018.02.003

CH3NH3PbI3-based planar perovskite solar cells were fabricated by slot-die coating, a scalable method. Slot-die coating tends to produce perovskite layers with much lower coverage with overgrown crystals than spin coating, which does not include a self-drying mechanism in the process. To mimic the self-drying behavior inherent in spin coating, the present study introduces a blowing step in the slot-die coating method, which significantly improved coverage of the prepared slot-die coated perovskite films. The slot-die-coated device with blowing showed a moderate power conversion efficiency (PCE) of 8.8%. The morphology of the slot-die-coated perovskite film is further improved by optimizing the deposition temperature. The combination of blowing and heating during the slot-die-coating step and the introduction of a printing-friendly hole transport layer resulted in a PCE of 12.7% for the devices fabricated in air. [Display omitted] •Scalable and roll-to-roll compatible deposition process is developed to produce planar perovskite solarcells.•The highest efficiency from single-step slot die coated perovskite solar cells is achieved.•Synergy effect of gas blowing and heating on morphology of slot die coated films is found.