High-Efficiency and scalable Solution-Sheared perovskite solar cells using green solvents

In this work, high-quality and large-area (10 × 10 cm2) perovskite film was prepared by solution-shearing method using acetonitrile as solvent at a substrate temperature of 45 °C. In contrast to the similar process with conventional DMF/DMSO solvent at substrate temperature of 140 °C, more compact film with much reduced crystalline domains and narrower domain boundaries was obtained. High-performance solar cell with a power conversion efficiency of 20.30% and significantly improved device stability can be fabricated from such film. Furthermore, uniform layers over a large area up to 100 cm2 were prepared by sequential shearing of c-TiO2, mp-TiO2, MAPbI3, and Spiro-OMeTAD on FTO substrate all using green solvents. The solar cell based on the all-solution-sheared films gave a high efficiency of 17.77% for device with the standard active area of 0.04 cm2 and 13.41% for large active area of 1.5 cm2. This strategy demonstrates the huge potential for module fabrication and future PSC commercialization.