National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401

A -- LICENSE AGREEMENTS WITH ONE OR MORE U.S. COMPANIES INTERESTED IN COMMECIALIZING STAND ALONE, PHOTOVOLTAIC POWERED ELECTROCHROMIC WINDOWS, AND RAPID COLOR CHANGE ELECTROCHROMIC/PV SUNGLASSES Sol Synopsis No. TT-114. Contact David Benson 303/384-6462. On behalf of the U.S. Department of Enery, the National Renewable Energy Laboratory (NREL) anticipates negotiating one or more license agreements with U.S. companies interested in commercializing stand alone, photovoltaic (PV) powered electrochromic windows, and rapid color change electrochromic/PV sunglasses. The PV powered electrochromic window patent provides a dynamic, electronically-controlled window glazing that can be operated so as to provide sunlight when it is needed and reject sunlight when thermal and lighting control is required. It includes a photovoltaic power source for switching the electrochromic coating. Compared to liquid-crystal electrochromic windows, the metal-oxide material used in this invention has several advantages: 1) low DC voltage is needed to operate the switching, 2) the coating absorbs rather than scatters light in the off position, 3) the material changes its transmittance in a continuous manner rather than switching from two extremes, and 4) it retains its on or off condition over 24 hours. The electrochromic/PV sunglasses can change tint in a few seconds or less. Under conditions of bright light, a deposited solar cell will generate a current to activate the tungsten oxide layer and darken the glass in less than two seconds. Contact Ken Touryan 303/275-3009, Dave Benson 303/384-6462, or Howard Branz 303/275-6022. (135)

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