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Pairing of Near-ultraviolet Solar Cells with Electrochromic Windows for Smart Management of the Solar Spectrum

Spectral Irradiance vs Wavelength

Electrochromic window (EC) technologies offer dynamic control of the optical transmission of the visible and near-infrared (near-IR) portions of the solar spectrum to reduce lighting, heating and cooling needs in buildings and to improve occupant comfort. Solar cells harvesting near-ultraviolet (near-UV) photons could satisfy the unmet need of powering such smart windows over the same spatial footprint without competing for visible or near-IR photons and without aesthetic and design constraints. In the Loo Lab, we designed and demonstrated organic single-junction solar cells that selectively harvest near-UV photons, produce single-junction operating voltages exceeding 1.2 V, and exhibit scalability in power generation. Integration of these solar cells with a polymer-based EC window (tailored to operate on ±1.2 V) enables intelligent management of the solar spectrum, with near-UV photons powering the regulation of visible and near-IR photons for natural lighting and heating purposes.

Read the full story here https://www.nature.com/articles/nenergy2017104.

For more infomation about Professor Loo's research please see the Organic and Polymer Electronics Laboratory site.