Vacuum‐Assisted Laminating Preparation for Carbon Film Electrode in Perovskite Solar Cells

As an alternative to an evaporated metal top electrode, the carbon film electrode has been successfully applied to small‐area rigid and flexible perovskite solar cells by a pressing transfer method. However, the plate‐to‐plate laminating process for the carbon film electrodes deposition has some shortcomings, such as the uneven and uncertain actual loaded pressure on device. Herein, the carbon film‐based top electrode is laminated onto the perovskite device via a vacuum‐assisted pressing technique with an automatic solar panel laminator. Compared with manual and pneumatic plate pressing, the vacuum laminating process can reduce the roughness of the carbon film and increase the contact area under relatively low working pressure. Consequently, the perovskite solar cells with vacuum laminated carbon electrodes can achieve a relatively high efficiency of 18.3% and exhibit application prospect for reproducible mass fabrication.