A uniform perovskite layer with full coverage, smooth top surface and enough thickness is essential for the performance of perovskite solar cells (PSCs). In this study, a solar cell with high-quality perovskite films as light absorbers is fabricated through a novel facile dual-flash method: first low pressure flash evaporation (LPFE), then high temperature flash annealing (HTFA) process. The high-quality perovskite films can be conducive not only to the separation and transmission of the electron and hole, but also to the absorption and utilization of sunlight. As a result, a high performance PSC with a solar-to-electrical power conversion efficiency of 19.15% is obtained. The entire perovskite films preparation can be achieved in low humidity air, showing a very promising prospect for industrial applications. (C) 2017 Elsevier Ltd. All rights reserved.