The aim of this proposal is to determine the relative atomic ordering of Y and Pr cations in (Y2O3)1-x(Pr2O3)x heterostructures on Si(111) using grazing incidence XAFS at the Y K- and Pr L3- absorption edges. RE (rare earth) cub-Pr2O3 and Y2O3 oxides crystallize in the bixbyite structure (space group Ia-3) and their miscibility to form a solid solution from the powder form was demonstrated many years ago [1]. Being the lattice parameter of cub-Pr2O3 2.7% bigger and that of Y2O3 2.4% smaller than twice the Si unit cell, thin (Y2O3)1-x(Pr2O3)x heterostructures permit for the cost-effective integration of lattice-matched as well as -mismatched SiGe epilayers on the Si platform for microelectronic, optoelectronic and photovoltaic applications.
Atom ic scale ordering in Pr - Y mixed oxide heterostructures
BOSCHERINI, FEDERICO;
2011
Abstract
The aim of this proposal is to determine the relative atomic ordering of Y and Pr cations in (Y2O3)1-x(Pr2O3)x heterostructures on Si(111) using grazing incidence XAFS at the Y K- and Pr L3- absorption edges. RE (rare earth) cub-Pr2O3 and Y2O3 oxides crystallize in the bixbyite structure (space group Ia-3) and their miscibility to form a solid solution from the powder form was demonstrated many years ago [1]. Being the lattice parameter of cub-Pr2O3 2.7% bigger and that of Y2O3 2.4% smaller than twice the Si unit cell, thin (Y2O3)1-x(Pr2O3)x heterostructures permit for the cost-effective integration of lattice-matched as well as -mismatched SiGe epilayers on the Si platform for microelectronic, optoelectronic and photovoltaic applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
