Premium
Metal versus dielectric back reflector for thin‐film Si solar cells with impact of front electrode surface texture
Author(s) -
Mercaldo Lucia V.,
Usatii Iurie,
Esposito Emilia M.,
Delli Veneri Paola,
Schüttauf JanWillem,
Moulin Etienne,
Haug FranzJosef,
Zhang Chao,
Meier Matthias
Publication year - 2016
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.2743
Subject(s) - materials science , electrode , texture (cosmology) , solar cell , dielectric , optoelectronics , front (military) , thin film , optics , nanotechnology , chemistry , mechanical engineering , physics , artificial intelligence , computer science , engineering , image (mathematics)
Thin‐film Si solar cells employ a back reflector (BR) for a more efficient use of the long wavelength light. Here, we have carried out a cross evaluation of metal (Ag‐based) and dielectric (white paint‐based) BR designs. Conclusive results have been reached regarding the most suitable BR type depending on the front electrode morphology, both with crater‐like and pyramidal texture. The ZnO/Ag BR is found to be optically more efficient because of improved light trapping, although the gain tends to vanish for rougher front electrodes. Thanks to non‐conventional Raman intensity measurements, this dependence on the front texture has been linked to the different weight of front and back interfaces in the light trapping process for the different morphologies. With rougher substrates, because the minor optical gain is accompanied by sputter‐induced electronic deterioration of the solar cell during the ZnO buffer layer deposition, the white paint‐based BR design is preferred. Copyright © 2016 John Wiley & Sons, Ltd.