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The authors are grateful for the support of the Natural Science Foundation of China (Grant: 51173207), Key projects of Guangdong Education Office (Grant: cxzd1101) and the Natural Science Foundation of Guangdong, China (Grants: 2011B090500004, 2012B091100313, 2012A090100006 and 2013C2FC0009). EPG acknowledges support from the Energy Materials Center at Cornell, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Basic Energy Sciences, under Award No. DESC0001086. This publication is based on work supported in part by Award No. KUS-C1-018-02 from King Abdullah University of Science and Technology.