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Optical performance of the honeycomb texture - a cell and module level analysis using the OPTOS formalism

 
: Tucher, N.; Müller, B.; Jakob, P.; Eisenlohr, J.; Höhn, O.; Hauser, H.; Goldschmidt, J.C.; Hermle, M.; Bläsi, B.

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Solar energy materials and solar cells 173 (2017), pp.66-71
ISSN: 0927-0248
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <7, 2017, Freiburg>
Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit BMU
0325292
English
Journal Article, Conference Paper
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Photovoltaik; Silicium-Photovoltaik; Neuartige Photovoltaik-Technologien; Oberflächen: Konditionierung; Passivierung; Lichteinfang; Photonenmanagement

Abstract
A comprehensive analysis of the optical properties of different surface textures for silicon solar cells must include (i) the optical performance at cell level as well as encapsulated to a module stack and (ii) a varying angle of incidence of the solar irradiation, as it influences the optical yield. Within this work, the OPTOS formalism (Optical Properties of Textured Optical Sheets) was used to compare a honeycomb texture featuring a high aspect ratio with state of the art random pyramids and the isotexture. The honeycomb texture exhibits an increased absorbed photocurrent density of 2.3 mA/cm(2) before and 0.7 mA/cm(2) after encapsulation compared to the isotexture for a 180 mu m thick solar cell. The simulated absolute value of 42.3 mA/cm(2) after encapsulation is even superior to the random pyramid texture with 41.5 mA/cm(2). Furthermore, a simulation-based optical yield analysis reveals that the angular irradiance of three exemplary terrestrial locations plays a minor role for the relative performance between the textures compared to influence of encapsulation effects.

: http://publica.fraunhofer.de/documents/N-480371.html