[1] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Northwestern Univ, Dept Chem, Mat Res Ctr, Evanston, IL 60208 USA
[3] Northwestern Univ, Argonne NW Solar Energy Res Ctr, Evanston, IL 60208 USA
[4] Polyera Corp, Skokie, IL 60077 USA
[5] Georgia Inst Technol, Sch Chem & Biochem, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA