Cristaux liquides sur silicium

Résumé

Les cristaux liquides sur silicium (en anglais, Liquid crystal on silicon ou LCoS) sont une technique de vidéoprojection fonctionnant par réflexion à l’instar du Digital Light Processing. Cette technique s’oppose à la technique des écrans à cristaux liquides (LCD) qui fonctionne par transmission. Catégorie:Technologie d'affichage Catégorie:Cristal liquide

Source officielle

https://fr.wikipedia.org/wiki/Cristaux_liquides_sur_silicium

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Liquid phase crystallized silicon on glass: Technology, material quality and back contacted heterojunction solar cells

Jan Haschke

Liquid phase crystallization has emerged as a novel approach to grow large grained polycrystalline silicon films on glass with high electronic quality. In recent years a lot of effort was conducted by different groups to determine and optimize suitable interlayer materials, enhance the crystallographic quality or to improve post crystallization treatments. In this paper, we give an overview on liquid phase crystallization and describe the necessary process steps and discuss their influence on the absorber properties. Available line sources are compared and different interlayer configurations are presented. Furthermore, we present one-dimensional numerical simulations of a rear junction device, considering silicon absorber thicknesses between 1 and 500 mu m. We vary the front surface recombination velocity as well as doping density and minority carrier lifetime in the absorber. The simulations suggest that a higher absorber doping density is beneficial for layer thicknesses below 20 mu m or when the minority carrier lifetime is short. Finally, we discuss possible routes for device optimization and propose a hybride cell structure to circumvent current limitations in device design. (C) 2016 The Japan Society of Applied Physics

Iop Publishing Ltd2016

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Liquid Crystal beam steering device for the infrared

Toralf Scharf

Albert-Ludwigs-Universität Freiburg1998

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A multiple-angle liquid crystal blazed grating beam deflector has been developed. It consists of a stack of liquid crystal blazed gratings where each layer can deflect incident light with very high efficiency into one of two different directions depending on the driving condition Pour steering angles (10.8 degrees, 7.2 degrees, 3.6 degrees, 0 degrees) with about 70% diffraction efficiency are demonstrated within 15V. The device's working principle, design considerations, fabrication process, and characterization results are described.

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa1998

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