Enhancing the perovskite solar cell performance by the treatment with mixed anti-solvent

At present, the surface modification of perovskites by solvent treatment has become the most effective way to improve the performance of planar perovskite solar cells. Here, phthalocyanine nickel as an additive was introduced into the anti-solvent chlorobenzene to form a mixed anti-solvent. Prior to completion of the perovskite crystals, a mixed anti-solvent was infiltrated into the perovskite surface to improve the interfacial contact of the perovskite with the hole-transporting layer. This method improved the crystal quality of the perovskite film, thus enhanced the charge transfer efficiency, and suppressed the recombination of carriers effectively. The perovskite solar cell constructed with this perovskite films treated by the optimal concentration of nickel phthalocyanine in the anti-solvent solution yielded a power conversion efficiency of 19.18% and the filling factor of 74.38% under 100 mW cm−2 illuminations.