Optimized Metal-Free Back Reflectors for High-Efficiency Open Rear c-Si Solar Cells
| Autor: | Andrea Ingenito, Arthur Weeber, Miro Zeman, Stefan L. Luxembourg, Pierpaolo Spinelli, Juan Camilo Ortiz Lizcano, Ji Liu, Olindo Isabella |
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| Rok vydání: | 2016 |
| Předmět: |
Fabrication
Materials science Silicon chemistry.chemical_element 02 engineering and technology Dielectric 01 natural sciences law.invention Optics law 0103 physical sciences Solar cell Electrical and Electronic Engineering FOIL method 010302 applied physics business.industry Energy conversion efficiency Photovoltaic system 021001 nanoscience & nanotechnology Condensed Matter Physics Distributed Bragg reflector Electronic Optical and Magnetic Materials chemistry Optoelectronics 0210 nano-technology business |
| Zdroj: | IEEE Journal of Photovoltaics. 6:34-40 |
| ISSN: | 2156-3403 2156-3381 |
| DOI: | 10.1109/jphotov.2015.2487827 |
| Popis: | The photovoltaic (PV) industry has recently become more oriented toward n-type c-Si solar cells. Among the different n-type solar cell architectures, bifacial cells are quickly emerging. The open-rear configuration of a bifacial device results in high transmittance (T) losses at long wavelengths (>1000 nm). This limitation is usually overcome at the module level either by using a bifacial encapsulation or by placing a reflective foil on the rear side. In this paper, we have investigated the application of a distributed Bragg reflector (DBR) and TiO2-based white paint (WP) as alternative metal-free back-reflector options applied to the textured open-rear of bifacial n-Pasha cells. Because of the high T losses at long wavelengths of the DBR applied on textured surface, its design and fabrication is studied in detail. The dielectric (DBR and WP) and optimized Ag back-reflectors, which are used as a reference, are applied to bifacial n-Pasha cells, and their performance is evaluated. In particular, we demonstrate T below 20% at 1200 nm by optimizing the DBR thickness for textured surfaces. In addition, the optimized DBR and WP show performance comparable with a state-of-the-art Ag back-reflector. The highest increase of the conversion efficiency is measured for the WP back-reflector: +0.34% absolute compared with n-Pasha measured with no-additional back-reflector. |
| Databáze: | OpenAIRE |
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