1. Key Laboratory of Photovoltaic and Energy Conservation Materials; Institute of Applied Technology, Hefei Institutes of Physical Science; Chinese Academy of Sciences; Hefei 230031 PR China
2. University of Science and Technology of China; Hefei 230026 PR China
3. NAAM Research Group, Department of Mathematics; Faculty of Science; King Abdulaziz University; Jeddah 21589 Saudi Arabia
4. Department of Mathematics; Quaid-I-Azam University; Islamabad 44000 Pakistan
5. State Key Laboratory of Alternate Electrical Power Systems with Renewable Energy Sources; North China Electric Power University; Beijing 102206 PR China