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      BaCl 2 :Er 3+ —A High Efficient Upconversion Phosphor for Broadband Near‐Infrared Photoresponsive Devices

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          Most cited references 37

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          Detailed Balance Limit of Efficiency of p-n Junction Solar Cells

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            Upconversion and anti-Stokes processes with f and d ions in solids.

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              Light trapping in silicon nanowire solar cells.

              Thin-film structures can reduce the cost of solar power by using inexpensive substrates and a lower quantity and quality of semiconductor material. However, the resulting short optical path length and minority carrier diffusion length necessitates either a high absorption coefficient or excellent light trapping. Semiconducting nanowire arrays have already been shown to have low reflective losses compared to planar semiconductors, but their light-trapping properties have not been measured. Using optical transmission and photocurrent measurements on thin silicon films, we demonstrate that ordered arrays of silicon nanowires increase the path length of incident solar radiation by up to a factor of 73. This extraordinary light-trapping path length enhancement factor is above the randomized scattering (Lambertian) limit (2n(2) approximately 25 without a back reflector) and is superior to other light-trapping methods. By changing the silicon film thickness and nanowire length, we show that there is a competition between improved absorption and increased surface recombination; for nanowire arrays fabricated from 8 mum thick silicon films, the enhanced absorption can dominate over surface recombination, even without any surface passivation. These nanowire devices give efficiencies above 5%, with short-circuit photocurrents higher than planar control samples.
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                Author and article information

                Journal
                Journal of the American Ceramic Society
                J. Am. Ceram. Soc.
                Wiley
                0002-7820
                1551-2916
                May 20 2015
                August 2015
                May 09 2015
                August 2015
                : 98
                : 8
                : 2508-2513
                Affiliations
                [1 ]State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Guangzhou 510641 China
                [2 ]Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
                Article
                10.1111/jace.13558
                © 2015

                http://onlinelibrary.wiley.com/termsAndConditions#vor

                http://doi.wiley.com/10.1002/tdm_license_1.1

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