15 May 2014 New light-trapping concept by means of several optical components applied to compact holographic 3D concentration solar module
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Abstract
A new light-trapping concept is presented, which joins broad bandwidth volume phase reflection holograms (VPRH) working together with three other optical components: specifically designed three-dimensional (3D) cavities, Total Internal Reflection (TIR) within an optical medium, and specular reflection by means of a highly reflective surface. This concept is applied to the design and development of both low concentration photovoltaic (LCPV) and solar thermal modules reaching a concentration factor of up to 3X. Higher concentrations are feasible for use in concentrated solar power (CSP) devices. The whole system is entirely made of polymeric materials (except for the solar cells or fluid carrying pipes), thus reducing cost by up to 40%. The module concentrates solar light onto solar cells – or fluid carrying pipes – with no need for active tracking of the sun, covering the whole seasonal and daily incident angle spectrum while it also minimizes optical losses. In this work we analyze the first experimentally measured optical characteristics and performance of VPRH in dichromated gelatin film (DCG) in our concept. The VPRH can reach high diffraction efficiencies (∼98%, ignoring Fresnel reflection losses). Thanks to specifically designed raw material, coating and developing process specifications, also very broad selective spectral (higher than 300 nm) and angular bandwidths (∼+20º) per grating are achieved. The VPRH was optimized to use silicon solar cells, but designs for other semiconductor devices or for fluid heating are feasible. The 3D shape, the hologram’s and reflective surface’s optical quality, the TIR effect and the correct coupling of all the components are key to high performance of the concentration solar module.
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Ayalid M. Villamarín Villegas, Francisco J. Pérez López, Antonio Calo López, Hugo-José Rodríguez San Segundo, "New light-trapping concept by means of several optical components applied to compact holographic 3D concentration solar module", Proc. SPIE 9140, Photonics for Solar Energy Systems V, 91400R (15 May 2014); doi: 10.1117/12.2051598; https://doi.org/10.1117/12.2051598
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