NDLI: Separation of light confinement and absorption sites for enhancing solar water splitting

Content Provider	Royal Society of Chemistry (RSC)
Author	Bartal, G. Koren, M. Gross Niv, A. Dotan, H. Rothschild, A.
Copyright Year	2016
Abstract	Lambertian light trapping is a well-known method for enhancing the light harvesting efficiency of solar cells. Since it is based on ray optics, it is conventionally considered as inapplicable for subwavelength ultrathin films. Here we show a way around this limitation by separating the light confinement and absorption sites within the stack of materials comprising the entire cell. We demonstrate this approach for ultrathin film hematite (α-Fe2O3) photoanodes designed for renewable hydrogen production via solar water splitting. Attaching a Lambertian back reflector (that is, a white scattering sheet) to the backside of the cell results in a photocurrent enhancement of 25% to 30%, depending on the hematite thickness, in comparison to the same cell with a specular back reflector (i.e., a mirror). Theoretical analysis suggests that even higher enhancement may be possible, exceeding 40% in some cases, if light escape through the cell edges could be prevented. The proposed approach is not material-specific and can be readily implemented in other materials and other types of solar cells. Another advantage of this approach is that the light management is achieved using simple commercial products, making the proposed approach cost-effective and easy to implement in a variety of solar cells and photodetectors.
Starting Page	3043
Ending Page	3051
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta06972f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lambert's cosine law Wavelength Hematite Renewable resource Hydrogen Water splitting Photocurrent Specular reflection Mirror
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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Separation of light confinement and absorption sites for enhancing solar water splitting

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