1. Key Laboratory of Photochemical Conversion and Optoelectronic MaterialsTechnical Institute of Physics and ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
2. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. School of Chemical SciencesThe University of Auckland Auckland 1142 New Zealand
4. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan
5. Beijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 P. R. China