1. Alan G. MacDiarmid Institute College of Chemistry Jilin University Changchun 130012 P. R. China
2. Division of Ionizing Radiation National Institute of Metrology, China Beijing 100029 P. R. China
3. State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 P. R. China
4. College of New Energy and Environment Jilin University Changchun 130021 P. R. China