Fast two-step deposition of perovskite via mediator extraction treatment for large-area, high-performance perovskite solar cells

Abstract

A fast and large-area-compatible two-step deposition method for perovskite is developed to achieve over 18% for MAPbI3.

Gravure‐Printed Flexible Perovskite Solar Cells: Toward Roll‐to‐Roll Manufacturing

“…Previously, we developed a modified two‐step method, MET, to reduce the preparation time of the perovskite layer . In the MET, a PbI 2 ‐DMSO complex is first deposited on the desired substrate.…”

“…Here, in order to reduce the flammability, we additionally mixed water with IPA in the DMSO‐extraction step. The mixing of water, a more polar solvent, into IPA resulted in the formation of more porous PbI 2 films . Therefore, it is also expected that the mixing of solvent minimizes the time required for the extraction of the DMSO from the PbI 2 ‐DMSO complex film and maximizes the reaction of PbI 2 with MAI molecules within the given time.…”

“…A uniform layer is formed by antisolvent dripping or bathing . In the two‐step method, a PbI 2 film is deposited first, and this is converted to perovskite by contacting with organic ammonium “halide” molecules in solution . For the one‐step method, many studies reported that smooth and uniform films can be produced in a small area with antisolvent dripping at a specific time during process.…”

“…The processing window for the two‐step method is wider and for that reason it is easier to scale up the deposition process for this method even though it requires more processing steps and thus more processing time. The processing time of the two‐step method was shortened for high‐throughput fabrication by introducing mediator extraction treatment (MET) in our previous study . Moreover, the processing solvents (such as 2‐propanol (IPA) or mixture of IPA) are less harmful to the human health.…”

A Compact and Smooth CH3NH3PbI3 Film: Investigation of Solvent Sorts and Concentrations of CH3NH3I towards Highly Efficient Perovskite Solar Cells

“…Organic-inorganic lead halide perovskite solar cells have attracted intensive attention due to the remarkable progress in power conversion efficiency (PCE), increasing rapidly to over 22% in a few years [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. The PCEs of perovskite solar cells with various architectures (mesoporous or planar heterojunction structures) are strongly dependent on the morphology of the perovskite film [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”