Organic photovoltaic (OPV) cells and organic light-emitting diodes (OLEDs) are energy harvesting and generation devices that have attracted great attention these years because of their low costs,thin film structures,flexibility and environment-friendly manufacturing processes.For such thin film devices,photon management methods that increase the light absorption of OPV cells and the light extraction from OLEDs are highly desirable.Here,we report the experimental efforts to fabricate geometrically tunable and spontaneously formed nano-wrinkle structures with large areas,and the theoretical results on photon management with the nano-wrinkles.