Al2O3/TiO2 nano-pattern antireflection coating with ultralow surface recombination

P. Spinelli, B. Macco, M.A. Verschuuren, W.M.M. Kessels, A. Polman

Research output: Contribution to journalArticleAcademicpeer-review

61 Citations (Scopus)
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Abstract

We present a nano-patterned dielectric coating for crystalline Si solar cells that combines excellent anti-reflection and passivation properties. The nano-patterned coating comprises an array of TiO2 nanocylinders placed on top of an ultra-thin Al2O3 layer on a flat Si(100) wafer. The antireflection effect stems from the preferential forward scattering of light through leaky Mie resonances in the TiO2 nanocylinders. The Al2O3 layer provides excellent passivation of the Si surface. We experimentally demonstrate ultralow surface recombination with carrier lifetimes above 4¿ms, combined with a reflectivity of 2.8% averaged over a broad spectral range.
Original languageEnglish
Article number233902
Pages (from-to)233902-1/4
Number of pages4
JournalApplied Physics Letters
Volume102
Issue number23
DOIs
Publication statusPublished - 2013

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