1. Instituto de Ciencia de los Materiales, Universitat de Valencia, Paterna 46980, Spain
2. Intenanomat S.L., Calle Catedrático José Beltrán 2, Paterna 46980, Spain
3. V.E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, Kyiv 03680, Ukraine
4. Institute of High Technologies, Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine