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    Ultra-low reflection porous silicon nanowires for solar cell applications

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    Type
    Article
    Authors
    Najar, Adel cc
    Charrier, Joël
    Pirasteh, Parastesh
    Sougrat, Rachid cc
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Core Labs
    Imaging and Characterization Core Lab
    Physical Science and Engineering (PSE) Division
    Date
    2012-07-11
    Online Publication Date
    2012-07-11
    Print Publication Date
    2012-07-16
    Permanent link to this record
    http://hdl.handle.net/10754/562009
    
    Metadata
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    Abstract
    High density vertically aligned Porous Silicon NanoWires (PSiNWs) were fabricated on silicon substrate using metal assisted chemical etching process. A linear dependency of nanowire length to the etching time was obtained and the change in the growth rate of PSiNWs by increasing etching durations was shown. A typical 2D bright-field TEM image used for volume reconstruction of the sample shows the pores size varying from 10 to 50 nm. Furthermore, reflectivity measurements show that the 35% reflectivity of the starting silicon wafer drops to 0.1% recorded for more than 10 μm long PSiNWs. Models based on cone shape of nanowires located in a circular and rectangular bases were used to calculate the reflectance employing the Transfert Matrix Formalism (TMF) of the PSiNWs layer. Using TMF, the Bruggeman model was used to calculate the refractive index of PSiNWs layer. The calculated reflectance using circular cone shape fits better the measured reflectance for PSiNWs. The remarkable decrease in optical reflectivity indicates that PSiNWs is a good antireflective layer and have a great potential to be utilized in radial or coaxial p-n heterojunction solar cells that could provide orthogonal photon absorption and enhanced carrier collection. ©2012 Optical Society of America.
    Citation
    Najar, A., Charrier, J., Pirasteh, P., & Sougrat, R. (2012). Ultra-low reflection porous silicon nanowires for solar cell applications. Optics Express, 20(15), 16861. doi:10.1364/oe.20.016861
    Publisher
    The Optical Society
    Journal
    Optics Express
    DOI
    10.1364/OE.20.016861
    ae974a485f413a2113503eed53cd6c53
    10.1364/OE.20.016861
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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