Functional nanostructured materials are the key to the high efficiency energy generation devices such as solar cell by enhancing the surface area. Solar cells on a polymer substrate can reduce the process cost and broaden the application area to portable electronics and building integrated solar cell. We have developed several novel approaches to fabricate high efficiency dye sensitized solar cell with on a heat sensitive plastic substrate without using any vacuum deposition techniques. The functional nanostructure showed great improvement in solar cell efficiency.