Optics and materials research for controlled radiant energy transfer in buildings. Annual project status report, January 1, 1991--December 31, 1991

摘要

Activities to develop thin film variable reflectivity electrochromic windows have focused in five areas in 1991: (1) evaluating the irreversible incorporation of lithium in the counterelectrode material, sputtered indium oxide; (2) responding to evidence that protons substitute for mobile lithium ions in ''standard'' five-layer electrochromic window structures operating in room air; (3) understanding the electronic and ionic conduction mechanisms in sputtered amorphous lithium niobate, the ion conductor adopted for electrochromic window structures fabricated at Tufts; (4) responding to the discovery that cathodic coloring of the variable reflecting tungsten bronze (Li(sub x)WO(sub 3)) is constrained by interaction with the underlying ITO or SnO(sub 2) transparent conductor in conventional electrochromic window structures; and (5) life testing of electrochromic window prototypes.