A Spectrally Tunable Dielectric Subwavelength Grating based Broadband Planar Light Concentrator
| Autor: | Volker J. Sorger, M. V. N. Surendra Gupta, Rishi Maiti, Bala Pesala, Ameen Elikkottil, Mohammed H. Tahersima |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science lcsh:Medicine Grating Concentrator Article law.invention 03 medical and health sciences 0302 clinical medicine law Photovoltaics Solar cell lcsh:Science Multidisciplinary business.industry Photovoltaic system Energy conversion efficiency lcsh:R Solar energy and photovoltaic technology 030104 developmental biology Electricity generation Optoelectronics lcsh:Q business Devices for energy harvesting 030217 neurology & neurosurgery Visible spectrum |
| Zdroj: | Scientific Reports Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) |
| ISSN: | 2045-2322 |
| Popis: | Energy consumption of buildings is increasing at a rapid pace due to urbanization, while net-zero energy buildings offer a green and sustainable solution. However, limited rooftop availability on multi-story buildings poses a challenge for large-scale integration of photovoltaics. Conventional silicon solar panels block visible light making them unfeasible to cover all the surfaces of a building. Here, we demonstrate a novel dielectric grating based planar light concentrator. We integrate this functional device onto a window glass transmitting visible light while simultaneously guiding near infrared (NIR) portion of sunlight to edges of the glass window where it is converted to electricity by a photovoltaic cell. Gratings are designed to guide NIR region and realize polarization independent performance. Experimentally, we observe 0.72% optical guiding efficiency in the NIR region (700–1000 nm), transmitting majority of the visible portion for natural room lighting. Integrating solar cell at the window edge, we find an electrical conversion efficiency of about 0.65% of NIR light with a 25 mm2 prototype. Major losses are coupling and guiding losses arising from non-uniformity in fabrication over a large area. Such a functional window combining energy generation, natural room lighting and heat load reduction could mitigate urban heat island effect in modern cities. |
| Databáze: | OpenAIRE |
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