Title: Aperiodic and randomized dielectric mirrors: alternatives to metallic back reflectors for solar cells
Authors: Lin, Albert
Zhong, Yan-Kai
Fu, Sze-Ming
Tseng, Chi Wei
Yan, Sheng Lun
Department of Electronics Engineering and Institute of Electronics
Issue Date: 5-May-2014
Abstract: Dielectric mirrors have recently emerged for solar cells due to the advantages of lower cost, lower temperature processing, higher throughput, and zero plasmonic absorption as compared to conventional metallic counterparts. Nonetheless, in the past, efforts for incorporating dielectric mirrors into photovoltaics were not successful due to limited bandwidth and insufficient light scattering that prevented their wide usage. In this work, it is shown that the key for ultra-broadband dielectric mirrors is aperiodicity, or randomization. In addition, it has been proven that dielectric mirrors can be widely applicable to thin-film and thick wafer-based solar cells to provide for light trapping comparable to conventional metallic back reflectors at their respective optimal geometries. Finally, the near-field angular emission plot of Poynting vectors is conducted, and it further confirms the superior light-scattering property of dielectric mirrors, especially for diffuse medium reflectors, despite the absence of surface plasmon excitation. The preliminary experimental results also confirm the high feasibility of dielectric mirrors for photovoltaics. (C)2014 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.22.00A880
ISSN: 1094-4087
DOI: 10.1364/OE.22.00A880
Volume: 22
Issue: 9
Begin Page: A880
End Page: A894
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