Highly transparent light-harvesting window film

摘要

We have simulated unique textured window films that capture solar radiation without compromising the window's transparency by scattering infrared light toward photovoltaic strips located at the edges of the window. These films are ideal for powering electrochromic glass, which is difficult to install as each window requires its own power source. Our most promising design consists of an embedded array of 35 degrees cones coated with a five-layer SiO2-Ag stack that was simulated to direct 1.4% of the incident light toward the edges and generate 1 W of power under a collimated 1000 W/m(2) AM1.5G source at 60 degrees and an average of 0.5 W over a full year when applied to a 1 m x 1 m window. The internal visible transmittance of the window with the applied film is 95% at normal incidence, and remains above 85% for viewing angles up to 60 degrees. The haze is 0.6% at normal incidence and 3.9% at 60 degrees. (C) 2015 Optical Society of America