For the Bright Future-Bulk Heterojunction Polymer Solar Cells with Power Conversion Efficiency of 7.4% Liang, Yongye ; Xu, Zheng ; Xia, Jiangbin ; Tsai, Szu-Ting ; Wu, Yue ; Li, Gang ; Ray, Claire ; Yu, Luping Abstract Publication: Advanced Materials Pub Date: May 2010 DOI: 10.1002/adma.200903528 Bibcode: 2010AdM....22E.135L