Patent ID: 7265891

Claim:
A thin film electrochromic device comprising: a substrate; a first electrode layer deposited directly on the substrate; an electrochromic thin film comprising lithium and characterized by an optical transparency that varies when a concentration of mobile lithium ions in the electrochromic thin film changes responsive to an external applied potential, the electrochromic thin film formed from a metal oxide precursor thin film vacuum deposited directly on the first electrode layer, wherein the metal oxide is one of tungsten oxide, molybdenum oxide, titanium oxide, tantalum oxide, and niobium oxide; an ion transfer thin film consisting of lithium and nitrogen, the ion transfer thin film vacuum deposited directly on the electrochromic thin film; an electrolyte thin film consisting of lithium, fluorine and nitrogen, the electrolyte thin film vacuum deposited directly on the ion transfer thin film; an ion storage thin film comprising lithium and vacuum deposited directly on the electrolyte thin film, the ion storage thin film further comprising an oxide of at least one of vanadium, cobalt, iridium, manganese, nickel, praseodymium, and cerium; and a transparent second electrode layer vacuum deposited directly on the ion storage thin film.