Next Generation Electrode Technology for Optimized Performance &

SAGE Electrochromics, Inc. proposes to evaluate the feasibility of replacing the indium doped tin oxide (ITO) transparent conductor TC with a thin-film Ag based stack having greatly reduced costs, enhanced performance and improved durability for electrochromic (EC) windows. This new system draws upon low-emissivity technology developed in the architectural glass coating industry to maximize photopic transparency while reflecting infrared energy. These antireflecting layers are concurrently and uniquely utilized as a device electrode, distributing the uniform current required for electrochromism to occur. The goals of this effort are to: (1) reduce the costs of the TC by a order of magnitude, (2) achieve a neutral device color by tuning reflection, and (3) enhance unpackaged moisture resistance and durability by developing a low permeability capping layer with good abrasion resistance. The resulting functional EC device will have greatly improved performance at a fraction of current costs. To accomplish these objectives, we will replace the ITO with a layer of silver dereflected by transparent oxide layers. Electrical connections for biasing the device will be made to the Ag. The electrode stack will be topped by a thin-film moisture barrier.