Spectral Camouflage Holographic Coating for Photovoltaic Solar Panel

In Phase I, Physical Optics Corporation (POC) demonstrated the feasibility of Spectral Camouflage Holographic Coatings (SCHOC) for photovoltaic (PV) silicon cells. In current solar panels, multilayer thin film antireflective coatings and cut-off filtersreject some visible wavelengths (mostly UV and violet-blue) while transmitting visible and near-IR, giving them a highly reflective, specular violet-blue spectral signature. SCHOC is based on a new holographic coating technology, multiplexing subtractiveand additive reflection holographic structures. SCHOC filters are flexible, environmentally stable, rugged, and nonspecular (diffuse). The SCHOC itself is commercially attractive because of its low-cost material and fabrication, and its compatibilitywith state-of-the-art solar cell technology. Phase I work involved a thorough design, theoretical analysis, and computer simulation of SCHOC filters, fabricating primary color filter modules, and demonstrating generation of color camouflaged PV cells. InPhase II, POC will optimize the SCHOC filter design and filter components fabrication, and will develop a fully scalable SCHOC technology to produce the most efficient, lowest-cost colored PV solar panels, and making possible large scale production at lowcost for commercial photovoltaic applications.