Patent ID: 6781164
Filing Date: 2004-08-24
Classification: H01L

Abstract:
A semiconductor element, substantially comprising:a substrate, an underlayer, epitaxially grown on the substrate, made of a first semiconductor nitride including at least one element selected from the group consisting of Al, Ga and In, the dislocation density of the underlayer being set to 1011/cm2 or below, the crystallinity of the underlayer being set to 90 seconds or below in full width at half maximum of X-ray rocking curve at (002) reflection, a first conductive layer of a first conduction type, epitaxially grown on the underlayer, made of a second semiconductor nitride including at least one element selected from the group consisting of Al, Ga and In, the dislocation of the first conductive layer being set to 1010/cm2 or below, the crystallinity of the first conductive layer being set to 150 seconds or below in full width at half maximum of X-ray rocking curve at (002) reflection, a second conductive layer of the first conduction type, epitaxially grown on the first conductive layer, made of a third semiconductor nitride including at least one element selected from the group consisting of Al, Ga and In, the dislocation of the second conductive layer being set to 1010/cm2 or below, the crystallinity of the second conductive layer being set to 90 seconds or below in full width at half maximum of X-ray rocking curve at (002) reflection, a third conductive layer of a second conduction type opposite to the first conduction type, epitaxially grown on the second conductive layer, made of a fourth semiconductor nitride including at least one element selected from the group consisting of Al, Ga and In, the dislocation of the third conductive layer being set to 1010/cm2 or below, the crystallinity of the third conductive layer being set to 150 seconds or below in full width at half maximum of X-ray rocking curve at (002) reflection, and a fourth conductive layer of the first conduction type, epitaxially grown on the third conductive layer, made of a fifth semiconductor nitride including at least one element selected from the group consisting of Al, Ga and In, the dislocation of the fourth conductive layer being set to 1010/cm2 or below, the crystallinity of the fourth conductive layer being set to 150 seconds or below in full width at half maximum of X-ray rocking curve at (002) reflection.