We have a benchmark record on the efficiency of perovskite solar cells. We have developed a mixed polymer solution of PTAA and Polystyrene (PS); a textured PTAA/perovskite interface has introduced on the light-input side of perovskite. One of the key bottlenecks in the optical loss of polymer-based inverted perovskite solar cells was solved by this simple method. By using anti-reflection coating on glass to let more light into the device, the efficiency has been improved to 21.6%, further demonstrating the importance of light management in perovskite solar.