Sequentially Slot‐Die‐Coated Perovskite for Efficient and Scalable Solar Cells
Iwan Zimmermann, Marc Al Atem, Olivier Fournier, Sophie Bernard, Sébastien Jutteau, Laurent Lombez, Jean Rousset
Abstract
Abstract Development of industrially relevant thin‐film deposition processes is a necessity for upscaling the perovskite solar cell technology to commercial product‐level. This work reports on a sequential deposition method for state‐of‐the art triple cation perovskite by slot‐die coating. During this two‐step process, first, a layer of lead iodide mixed with cesium iodide is deposited, followed by applying the organic cations on top, inducing conversion to perovskite during a second slot‐die coating step. By carefully tuning the ink composition and the deposition parameters, uniform perovskite layers of 5 × 10 cm 2 are obtained. Power conversion efficiencies up to 19% for small laboratory solar cells adopting a planar device configuration and up to 15.2% for mini‐modules with an aperture area of 12 cm 2 are presented. These values are among the highest efficiencies achieved in the literature for slot‐die‐coated perovskite.