Title: Approaching conversion limit with all-dielectric solar cell reflectors
Authors: Fu, Sze Ming
Lai, Yi-Chun
Tseng, Chi Wei
Yan, Sheng Lun
Zhong, Yan Kai
Shen, Chang-Hong
Shieh, Jia-Min
Li, Yu-Ren
Cheng, Huang-Chung
Chi, Gou-Chung
Yu, Peichen
Lin, Albert
Department of Electronics Engineering and Institute of Electronics
Department of Photonics
Issue Date: 9-Feb-2015
Abstract: Metallic back reflectors has been used for thin-film and wafer-based solar cells for very long time. Nonetheless, the metallic mirrors might not be the best choices for photovoltaics. In this work, we show that solar cells with all-dielectric reflectors can surpass the best-configured metal-backed devices. Theoretical and experimental results all show that superior large-angle light scattering capability can be achieved by the diffuse medium reflectors, and the solar cell J-V enhancement is higher for solar cells using all-dielectric reflectors. Specifically, the measured diffused scattering efficiency (D.S.E.) of a diffuse medium reflector is >0.8 for the light trapping spectral range (600nm-1000nm), and the measured reflectance of a diffuse medium can be as high as silver if the geometry of embedded titanium oxide(TiO2) nanoparticles is optimized. Moreover, the diffuse medium reflectors have the additional advantage of room-temperature processing, low cost, and very high throughput. We believe that using all-dielectric solar cell reflectors is a way to approach the thermodynamic conversion limit by completely excluding metallic dissipation. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.23.00A106
ISSN: 1094-4087
DOI: 10.1364/OE.23.00A106
Volume: 23
Begin Page: A106
End Page: A117
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