1. School of New Energy and Materials, Southwest Petroleum University (SWPU), Chengdu, 610500, China
2. Sichuan Shale Gas Project Management Department, CNPC Bohai Drilling Engineering Co. Ltd., Chengdu 610057, China
3. The Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052, Australia