a
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, P. O. Box 415, Chengdu 610041, P. R. China
E-mail: jyhao@uestc.edu.cn
;
Fax: 0086-(0)28-83201060
;
Tel: 0086-(0)28-83201202
b
School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
c
Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China