Patent ID: 8742473
Filing Date: 2014-06-03
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate across an active region of a semiconductor substrate; spaced apart source and drain regions in the active region on opposite sides of the gate; a main channel impurity region in the active region between the source and drain regions, and having a first channel impurity concentration; and a lightly doped channel impurity region in the active region adjacent to the drain region, the lightly doped channel impurity region having a same conductivity type as the main channel impurity region and a second channel impurity concentration that is lower than the first channel impurity concentration, wherein both the lightly doped channel impurity region and the main channel impurity region contain a first element including one of Group III and Group V elements of a Mendeleev Periodic Table; and wherein the lightly doped channel impurity region further includes a second element, including a different Group element from the first element and the second element including one of the Group III and the Group V elements.