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Resonant dielectric high-contrast gratings as spectrum splitting optical elements for ultrahigh efficiency (>50%) photovoltaics

Darbe, Sunita and Atwater, Harry (2015) Resonant dielectric high-contrast gratings as spectrum splitting optical elements for ultrahigh efficiency (>50%) photovoltaics. In: IEEE 42nd Photovoltaic Specialist Conference (PVSC). IEEE , Piscataway, NJ, pp. 1-4. https://resolver.caltech.edu/CaltechAUTHORS:20151224-075616341

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Abstract

Resonant dielectric gratings are explored as low cost spectrum-splitting optical elements in a photovoltaic device architecture that incorporates many independently connected subcells of different bandgaps for ultrahigh efficiency (>50%). Gratings can have broadband reflectivity by appropriately offsetting grating resonances. Subwavelength feature sizes suppress diffraction, and the high-refractive index of the grating layer leads to relatively angle-insensitive reflectance. Gratings can be fabricated by nanoimprint lithography, making them a scalable and economical option for photovoltaic applications. Using these gratings to create a series of dichroic filters to separate incident solar light into a series of bands which can then be coupled into independent subcells has potential for high efficiency by overcoming losses due to lack of absorption of subbandgap photons and thermalization of excited carriers which account for loss of over 40% of incident power on single-junction solar cells. Independent connection and physically separated subcells permit freer bandgap selection and relieve the current-matching constraint which limits conventional monolithic tandem multijunction cell efficiency.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1109/PVSC.2015.7356160 DOIArticle
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7356160PublisherArticle
ORCID:
AuthorORCID
Darbe, Sunita0000-0002-8099-1814
Atwater, Harry0000-0001-9435-0201
Additional Information:© 2015 IEEE.
Subject Keywords:III-V semiconductor materials, optical filters, optical metamaterials, photovoltaic systems, reflectivity, resonance, silicon splitting
Record Number:CaltechAUTHORS:20151224-075616341
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151224-075616341
Official Citation:Darbe, Sunita; Atwater, Harry, "Resonant dielectric high-contrast gratings as spectrum splitting optical elements for ultrahigh efficiency (>50%) photovoltaics," in Photovoltaic Specialist Conference (PVSC), 2015 IEEE 42nd , vol., no., pp.1-4, 14-19 June 2015 doi: 10.1109/PVSC.2015.7356160
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63210
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Dec 2015 17:30
Last Modified:03 Oct 2019 09:26

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