Silicon nitride grating based planar spectral splitting concentrator for NIR light harvesting
Abstract
We design a multi-layered solar spectral splitting planar concentrator for near infrared (NIR) light energy harvesting application. Each layer includes a silicon nitride based subwavelength diffraction grating on top of a glass substrate that is optimized to diffract the incoming solar radiation in a specific band from a broad spectral band (700-1400 nm in the NIR region) into guided modes propagating inside the glass substrate. The steep diffraction angle due to subwavelength grating results in concentrated light at the edge of each layer where it is then converted to electricity using a photovoltaic cell. The spectral splitting planar concentrator shows an overall NIR guiding efficiency of ∼18%, and power conversion efficiency of ∼11%. The design can be potentially used for building integrated photovoltaics application.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 07, 2020
- Source ID
- 10.1364/oe.390666
Entities
People
- Ameen Elikkottil
- Bala Pesala
- Mohammad H Tahersima
- Surendra Gupta
- Volker Sorger
Organizations
- Air Force Office of Scientific Research
- Department of Science and Technology