Morphological Stability and Performance of Polymer-Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization - Wong,HC; Li,Z; Tan,CH; Zhong,H; Huang,Z; Bronstein,H; McCulloch,I; Cabral,JT; Durrant,JR (ACS NANO, 2014)