Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 9: Functional Materials - Battery Materials II

MM 9.5: Vortrag

Montag, 11. März 2013, 12:45–13:00, H26

Large Area Ultrathin Alumina Membranes to Fabricate Highly Ordered heterojunction Core-Shell Nanostructure — •Ahmed Al-Haddad^1,2, Huaping Zhao¹, Ranjith Vellacheri¹, Yan Mi¹, Samar Tarisch^1,2, and Yong Lei¹ — ¹Fachgebiet 3D-Nanostrukturierung, Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, Prof. Schmidt Str. 26, 98693 Ilmenau, Germany. — ²Department of Physics, College of Science, University of Al-Mustansiryah, Baghdad, Iraq.

Using an innovative technique, we created a large area of ultrathin alumina membranes (UTAMs) on silicon substrates to fabricate highly ordered silicon nanoporous arrays and silicon nanowires arrays by wet-chemical etching. Then CdTe is electrochemically deposited on silicon nanowires and silicon nanoporous structures, producing Si-CdTe core-shell nanowires and CdTe-Si core-shell nanostructures, respectively. This approach is aiming at the realization of high efficient solar cells based on Si-CdTe core-shell nanowires. Morphology and crystallization of the resulting core-shell nanowires were investigated by scanning electron microscope, X-ray diffraction and transmission electron microscope. The optical absorption investigation was also carried out for these arrays. The proposed fabrication method is an ef*cient and controllable technique that can be utilized to develop photovoltaic devices of core*shell structures with different compound semiconductor materials.