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3 August 2021 Ultra-wideband tunable plasmonic selective absorber for dynamic synergistic solar and thermal energy conversion
Po-Chun Hsu
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Proceedings Volume 11796, Active Photonic Platforms XIII; 117960E (2021) https://doi.org/10.1117/12.2594981
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Building heat management is responsible for approximately 15% of the global energy consumption and greenhouse gas emission. This energy consumption can be reduced if buildings can directly utilize the renewable thermal source/sink from the sun (solar heating) and the deep space (radiative cooling). This concept of "net-zero-energy" buildings requires a significant amount of research efforts in photonics and materials science. In this talk, I will introduce our recent work on the dynamic selective absorber that can control the absorption/emission spectral property from UV to mid-IR and electrochemically switch between solar heating and radiative cooling. For solar heating, the device has the ideal property of a selective solar absorber that absorbs strongly in the solar spectrum and emits poorly in mid-IR. For radiative cooling, the solar absorptivity decreases, and the mid-IR emissivity increases. The working principle is based on electrochemically reversible deposition of plasmonic nanoparticles that have broadband resonance in solar spectrum but act as a continuous metal film in mid-IR based on effective medium theory. For basic science, our work interrogates the fundamental interface chemistry to achieve the nanoparticle deposition and performs numerical modeling to guide the structure design. For application, if used as a smart building envelope, this device can switch and adapt to different weather, solar radiation, and occupant preference, thereby maximizing the utilization of renewable heat/cold sources.
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© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Po-Chun Hsu "Ultra-wideband tunable plasmonic selective absorber for dynamic synergistic solar and thermal energy conversion", Proc. SPIE 11796, Active Photonic Platforms XIII, 117960E (3 August 2021); https://doi.org/10.1117/12.2594981
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KEYWORDS
Solar energy
Plasmonics
Mid-IR
Nanoparticles
Switches
Photonics
Solar radiation
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