An optically enhanced architecture can be used to fabricate high-performance polymer solar cells. The basic optical parameters that control light propagation in a layered device are such that an optimal light harvesting is achieved. The general character of such optically enhanced architecture is demonstrated by applying it to two different kinds of low bandgap polymers. Disclaimer: Supplementary materials have been peer-reviewed but not copyedited. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.