The authors are grateful to Professor Chong Cheng from the University of Buffalo for the original molecular structure design of BCPV. This work has been supported by NTU-A*STAR Silicon Technologies Centre of Excellence under the program grant (No. 11235100003), start-up grant (No. M4080141.040) from Nanyang Technological University, and Grants Tier 2 MOE2010-T2-2-010 (No. M4020020.040 ARC2/11) and Tier 1 (Nos. M4010360.040 RG29/10 and M4010359.040.703012) from Ministry of Education, Singapore, and the research grant (No. MOST104-2221-E-035-078-MY2) from the "Ministry of Science and Technology", and the grants from the National Natural Science Foundation of China (NSFC) (No. 21677102). The authors also appreciate the Precision Instrument Support Center of Feng Chia University in providing the fabrication and measurement facilities.
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