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Title: Enhanced broadband absorption is silicon micro-structures by laser processing for solar cells
Keywords: broadband, micro, nano-structure, laser processing, solar cells, anti-reflection
Issue Date: 28-Oct-2014
Citation: FU XIAOTIAN (2014-10-28). Enhanced broadband absorption is silicon micro-structures by laser processing for solar cells. ScholarBank@NUS Repository.
Abstract: Laser technology has become one of the commonly applied techniques for high-efficiency silicon wafer solar cell fabrication. In this thesis, laser interference lithography (LIL) and micro-lens array (MLA) lithography are adopted as mask-free and efficient techniques, associated with metal catalyst assisted chemical etching, to fabricate silicon nano-structures arrays. The surface anti-reflection performance and light trapping are significantly improved by sub-wavelength structures at ultra-high aspect ratios, which create gradient refractive index from air ambient to wafer substrate. Furthermore by varying the surface geometry and feature design of the nano-structures arrays, the light absorption in the nano-structures are boosted by extending the light travelling path and changing the silicon volume ratio at the nano-structures layers. Meanwhile, with the decoration of metallic nanoparticles on silicon nano-structures, the surface plasmon resonance can be excited to further enhance broadband anti-reflection, achieving an ultra-low reflection across the broad spectrum from 300 to 1200 nm.
Appears in Collections:Master's Theses (Open)

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