1. Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization The University of Toledo Toledo OH 43606 USA
2. School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou 215006 China
3. Ordered Matter Science Research Center and College of Chemistry Nanchang University Nanchang 330031 China