Electron Spin Resonance of Chromium--Platinum Pair in Silicon

概要

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We have investigated a chromium--platinum pair in silicon by electron spin resonance measurement. A new ESR spectrum originating from a chromium--platinum pair has been detected in both n- and p-type silicons diffused with chromium and platinum. The anisotropic $g$-tensor obtained by analyzing the angular dependence of the ESR spectrum shows a monoclinic ($C_{1h}$) symmetry with $g$-values of $g_{1}=4.67$, $g_{2}=2.99$, and $g_{3}=1.80$. The $g_{1}$ axis is along the $\langle 110 \rangle$ direction. The $g_{2}$ and $g_{3}$ axes are perpendicular to the $g_{1}$ axis, and the $g_{2}$ axis is rotated from the $\langle 100 \rangle$ direction to the $\langle 111 \rangle$ direction at an angle of 20\circ. The anisotropic character of monoclinic ($C_{1h}$) symmetry results from the nearest-neighbor configuration consisting of a Pt atom at a substitutional site distorted by the displacement of Pt along the $\langle 100 \rangle$ direction and a Cr atom at the nearest-neighbor interstitial site. The ESR measurement under illumination suggests that a chromium--platinum pair forms a donor like electron trap level.
2011-08-25