Excellent antireflection properties of vertical silicon nanowire arrays
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Excellent antireflection properties of vertical silicon nanowire arrays
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| Creator |
Srivastava, Sanjay K.
Kumar, Dinesh Singh , P. K. Kar, M. Kumar, Vikram Husain, M. |
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| Subject |
Energy Fuels
Materials Science |
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| Description |
We report a simple approach to prepare cost effective antireflective surface directly on silicon wafers, which consists of arrays of vertically aligned silicon nanowires (VA-SiNWA). Large area VA-SiNWA were realized by silver induced wet chemical etching of p-silicon (1 0 0) substrates in aqueous HF and AgNO3 solution at room temperature. Length of Si wires (diameter in 50–300 nm range) was found to increase linearly with etching time (0–120 min). A remarkable reduction in reflectivity (Rλ) for surfaces with Si wires was observed. The value of Rλ less than 2% was realized in the 300–600 nm wavelength range in the case of ∼12 μm long Si wires, a value better than the best Rλ reported in anisotropically textured surface or single layer antireflection coatings. The VA-SiNWA behaves as a subwavelength structured surface that could suppress the reflectivity to a great extent. Such surfaces may have potential applications as antireflection surface for silicon solar cells.
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| Publisher |
Elsevier
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| Date |
2010-02-21
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/147/1/120.pdf
Srivastava, Sanjay K. and Kumar, Dinesh and Singh , P. K. and Kar, M. and Kumar, Vikram and Husain, M. (2010) Excellent antireflection properties of vertical silicon nanowire arrays. Solar Energy Materials and Solar Cells , 94 (9). pp. 1506-1511. ISSN 0927-0248 |
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| Relation |
http://dx.doi.org/10.1016/j.solmat.2010.02.033
http://npl.csircentral.net/147/ |
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