Improvements in short-circuit currents of micromprph solar cells are investigated, with respect of nano-imprinted textures to glass superstrate. 2-D U-like periodic textures are optimized by means of 3-D rigorous optical simulations. Simulations indicate potential for > 35 % improvements in JSCbot for the optimized U-like textures with high aspect ratio compared to state-of-the-art random textures.