Porous Nanomaterials for Ultrabroadband Omnidirectional Anti‐Reflection Surfaces with Applications in High Concentration Photovoltaics |
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| Authors: | Yuan Yao Kyu‐Tae Lee Xing Sheng Nicolas A. Batara Nina Hong Junwen He Lu Xu Muhammad M. Hussain Harry A. Atwater Nathan S. Lewis Ralph G. Nuzzo John A. Rogers |
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| Affiliation: | 1. Department of Chemistry, University of Illinois at Urbana‐Champaign, Urbana, IL, USA;2. Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana‐Champaign, Urbana, IL, USA;3. Department of Electronic Engineering, Tsinghua University, Beijing, China;4. Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA, USA;5. J. A. Woollam Co., Inc, Lincoln, NE, USA;6. Integrated Nanotechnology Lab, CEMSE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia;7. The Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, CA, USA;8. Kavli Nanoscience Institute, California Institute of Technology, Pasadena, CA, USA;9. Division of Chemistry and Chemical Engineering, Beckman Institute, California Institute of Technology, Pasadena, CA, USA |
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| Abstract: | Materials for nanoporous coatings that exploit optimized chemistries and self‐assembly processes offer capabilities to reach ≈98% transmission efficiency and negligible scattering losses over the broad wavelength range of the solar spectrum from 350 nm to 1.5 µm, on both flat and curved glass substrates. These nanomaterial anti‐reflection coatings also offer wide acceptance angles, up to ±40°, for both s‐ and p‐polarization states of incident light. Carefully controlled bilayer films have allowed for the fabrication of dual‐sided, gradient index profiles on plano‐convex lens elements. In concentration photovoltaics platforms, the resultant enhancements in the photovoltaics efficiencies are ≈8%, as defined by experimental measurements on systems that use microscale triple‐junction solar cells. These materials and their applications in technologies that require control over interface reflections have the potential for broad utility in imaging systems, photolithography, light‐emitting diodes, and display technologies. |
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| Keywords: | anti‐reflections nanomaterials nanostructures photovoltaics |
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