ENHANCING THE EFFICIENCY OF TRIPLE-CATION DOCTOR-BLADE PEROVSKITE SOLAR CELLS WITH THE ADDITION OF CHLOROBENZENE
Abstract - Perovskite solar cells (PSCs) have been the fastest-advancing solar cell technology in terms of efficiency over the past decade. Currently, small-area cell efficiency can reach up to ~25% conversion efficiency. However, this efficiency significantly decreases when scaled up in size, a reduction that poses a major bottleneck for the future mass production and commercialization of PSCs. In the manufacturing process, the commonly used spin-coating method can achieve high efficiency on small-area devices but struggles with scalability. Conversely, the blade coating technique, a scalable technology that produces uniform films, often results in perovskite films with more defects compared to those made by spin-coating. These defects trigger recombination in the perovskite film, which further reduces the efficiency and lifespan of the PSCs. In this study, we developed a scalable blade coating technique for triple-cation perovskite, offering better stability compared to the traditionally used single-cation perovskite material (MAPbI3). By adding the antisolvent chlorobenzene (CB) to a triple cation perovskite solution, our results indicate that the addition of CB promotes the grain growth of the perovskite film while simultaneously reducing defects within the film. As a result of these modifications, the conversion efficiency of our triple-cation PSCs, produced through doctor-blade coating, increased from an initial 12.56% to an impressive 15.79%, representing an increase of 25.72%.
Keywords - Perovskite、Blade coating、Anti-solvent