1. Electrical and Computer Engineering Department, University of Alberta, Alberta T6G 1H9, Canada
2. Electrical and Electronics Engineering Department, Atilim University, Ankara 06830, Turkey
3. Physics Department, Canakkale Onsekiz Mart University, Canakkale 17100, Turkey
4. Physics Department, Middle East Technical University, Ankara 06800, Turkey
5. The Center of Solar Energy Research and Applications (GÜNAM), Middle East Technical University, Ankara 06800, Turkey