1. Metallurgical and Materials Engineering Department, Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey; Microelectronics, Guidance and Electro-Optics Division, Aselsan Inc., Cankırı Yolu 7. Km, 06750 Akyurt, Ankara, Turkey; and Center for Solar Energy Research and Applications (GUNAM), Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey
2. Center for Solar Energy Research and Applications (GUNAM), Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey and Micro and Nanotechnology Graduate Program, Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey
3. Metallurgical and Materials Engineering Department, Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey and Center for Solar Energy Research and Applications (GUNAM), Middle East Technical University, Universiteler Mah. Dumlupinar Blv. No:1, 06800 Cankaya, Ankara, Turkey