1. Department of Micro and Nanotechnology; Middle East Technical University (METU); Ankara 06800 Turkey
2. Department of Polymer Science & Technology; METU; Ankara 06800 Turkey
3. Department of Metallurgical and Materials Engineering; METU; Ankara 06800 Turkey
4. Department of Chemistry; METU; Ankara 06800 Turkey
5. The Center for Solar Energy Research and Application; METU; Ankara 06800 Turkey