Mrs Huda Alkhaldi (ANU)
Over the past two decades, nanoporous semiconductors such as Si, Ge and SixGe1-x alloys have attracted remarkable interest in both fundamental research and industrial applications. Such materials can be used as filters, sensors, and as anodes for electric batteries. Much research has focused on studying porosity in Ge, dating back to 1982, where it was reported that irradiation-induced macroscopic swelling occurred in amorphous materials. A porous structure can be formed by using several ions species. A low fluence of 1015 ion/cm2 can drastically change the surface morphology. Naoporous structure is also sensitive to the temperature as reported by Stritzker where a porous structure in Ge can be formed between -80°C to 200°C. Out of this range, there is no pore formation. However,. The only study which investigated porosity in Si1-xGex alloys is by Romano et al they found a porous structure at 90% of Ge, no porosity at lower Ge content. On the other hand this current research has observed a porous structure in Si1-xGex alloys for x≥0.77 irradiation at room temperature. In the current work, we characterize the pore formation with respect to the implantation temperature and the alloy compositions. Multi characterization techniques have used including electron microscopy (TEM, and SEM), and optical profilometry. References  H. Föll, J. Carstensen, and S. Frey, "Porous and Nanoporous Semiconductors and Emerging Applications," J.Nanomater., vol. 2006, pp. 1-10, 2006.  G. Kaltsas, A. Nassiopoulos, and A. G. Nassiopoulou, "Characterization of a silicon thermal gas-flow sensor with porous silicon thermal isolation," Sens.J, IEEE, vol. 2, pp. 463-475, 2002.  N. G. Rudawski, B. L. Darby, B. R. Yates, K. S. Jones, R. G. Elliman, and A. A. Volinsky, "Nanostructured ion beam-modified Ge films for high capacity Li ion battery anodes," AppL. Phys.Lett., vol. 100, p. 083111, 2012.  B. R. Appleton, O. W. Holland, J. Narayan, O. E. Schow, J. S. Williams, K. T. Short, et al., "CHARACTERIZATION OF DAMAGE IN ION-IMPLANTED GE," Appl. Phys. Lett., vol. 41, pp. 711-712, 1982 1982.  B. Stritzker, R. G. Elliman, and J. Zou, "Self-ion-induced swelling of germanium," Nucl. Instrum. Methods Phys. Res., Sect. B., vol. 175, pp. 193-196, Apr 2001.  L. Romano, G. Impellizzeri, L. Bosco, F. Ruffino, M. Miritello, and M. G. Grimaldi, "Nanoporosity induced by ion implantation in deposited amorphous Ge thin films," J. Appl. Phys., vol. 111, p. 5, Jun 2012.
Mrs Huda Alkhaldi (ANU)