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Plasmonic-photonic arrays with aperiodic spiral order for ultra-thin film solar cells

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2012-05-07
Trevino, Jacob
Forestiere, Carlo
Dİ MARTİNO, Giuliana
Yerci, Selçuk
Priolo, Francesco
Dal Negro, Luca
We report on the design, fabrication and measurement of ultrathin film Silicon On Insulator (SOI) Schottky photo-detector cells with nanostructured plasmonic arrays, demonstrating broadband enhanced photocurrent generation using aperiodic golden angle spiral geometry. Both golden angle spiral and periodic arrays of various center-to-center particle spacing were investigated to optimize the photocurrent enhancement. The primary photocurrent enhancement region is designed for the spectral range 600nm-950nm, where photon absorption in Si is inherently poor. We demonstrate that cells coupled to spiral arrays exhibit higher photocurrent enhancement compared to optimized periodic gratings structures. The findings are supported through coupled-dipole numerical simulations of radiation diagrams and finite difference time domain simulations of enhanced absorption in Si thin-films. (C)2012 Optical Society of America