A method is provided for fabricating a High-K layer. The method includes providing a substrate, applying a first precursor gas on the substrate such that the substrate absorbs first precursor gas molecules in a chemical absorption process, and removing the unabsorbed first precursor gas using a first inert gas. The method also includes applying a second precursor gas on the substrate, and forming a first thin film on the substrate as a reaction product of the second precursor gas and the absorbed first precursor gas molecules. Further, the method includes removing unreacted second precursor gas and byproducts using a second inert gas, and forming a high-K layer on the substrate by forming a plurality of the first thin films layer-by-layer.