Journal
ENERGY TECHNOLOGY
Volume 9, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202000792
Keywords
ambient processes; cosolvents; doctor blades; perovskites; solar cells
Categories
Funding
- Bureau of Energy [K455DR1140]
- Ministry of Science and Technology of Taiwan [MOST 107-2221-E-006-190-MY3, MOST 107-2119-M-006-002, MOST 108-3116-F-006-001, 108-2218-E-006-043-MY3, MOST 109-2222-E-260-001-MY3]
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program
- Ministry of Science and Technology in Taiwan [MOST 109-2634-F-006-020]
- Higher Education Sprout Project, Ministry of Education
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This study demonstrates a doctor-blading process for fabricating triple-cation halide-perovskite thin films using eco-friendly solvents under ambient conditions. Through optimizing the solvent composition in the precursor and post-treatment conditions, high-performance solar cell devices are achieved.
A doctor-blading process for the fabrication of triple-cation halide-perovskite thin films using eco-friendly solvents under ambient conditions is demonstrated. An eco-friendly perovskite precursor composed of gamma-butyrolactone (GBL)/dimethylsulfoxide (DMSO)/isopropanol (IPA) mixture is used. The coordination between PbI2 and DMSO effectively suppresses the perovskite crystal grow rate which results in a dense and uniform film. However, the intermediate DMSO-PbI2 phase residual has a negative impact on the perovskite film quality. The amount of residues, the trap-state defect density, the perovskite film uniformity, and the device performance can be considerably affected by adding IPA in the precursor due to its capability to facilitate DMSO evaporation. Heating post-treatment on the top side of the film homogenizes the evaporation rate of the air-liquid surface which leads to a larger grain size and unbroken film. The device using perovskite solution with GBL/DMSO/IPA mixture as solvent achieves a decent power conversion efficiency (PCE) of 12.3% with a V-oc of 1.01 V and a J(sc) of 19.3 mA cm(-2). The bare device retains 76.5% of its original PCE after 25 days under ambient environment at 35 degrees C, with 35-40% relative humidity. A large-size device with an active area of 2.4 cm(2) delivers a PCE of 8.52%.
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