Array substrate for liquid crystal display and method for fabricating the same

A method of fabricating an array substrate for a liquid crystal display device, comprising the steps of:

• forming a gate electrode and a gate line over a substrate;
• forming a gate insulating film over the substrate;
• forming a semiconductor layer over the gate insulating film;
• forming a data line, a source electrode, and a drain electrode over the gate insulating film, each of the data line, the source electrode, and the drain electrode including, at least in part, two layers of conductive materials, the step including removing portions of at least one of the two layers to pattern the drain electrode and, at the same time, define a first drain contact hole penetrating the two layers;
• forming a protective layer over the gate insulating film, the data line, the source electrode, and the drain electrode, the protective layer having a second drain contact hole communicating with the first drain contact hole;
• and
• forming a pixel electrode over the protective layer, the pixel electrode contacting the drain electrode at inner surfaces of the first drain contact hole formed in the drain electrode through the second drain contact hole.