Our Adv. Mater. paper on inverted polymer solar cells is featured as an inside back cover

  Our Adv. Mater. paper (Adv. Mater. 2017, 29, 1604044) on inverted polymer solar cells is featured as an inside back cover. This work reports compositional and surface modifications to a low-temperature-processed TiO₂ electron-transport layer to improve device efficiency and more importantly to eliminate the light-soaking issues.