In this work, one-step coating of CsPbBr3 thin films using the mist deposition method is demonstrated. The CsPbBr3 layer is composed of large grains with an average size of approximately 1.4 mu m, and it fully covers the substrate surface, unlike the layers prepared by conventional one-step spin-coating methods, so that efficient carrier transport is realized. Carbon-based CsPbBr3 perovskite solar cells (PSCs) fabricated using the mist deposition method exhibit a stabilized power conversion efficiency of 7.7%, which is a record value for carbon-based CsPbBr3 PSCs prepared via a one-step solution process.