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Efficiency (>15%) for thin‐film epitaxial silicon solar cells on 70 cm 2 area offspec silicon substrate using porous silicon segmented mirrors
Author(s) -
KuzmaFilipek I.,
Nieuwenhuysen K.V.,
Hoeymissen J.V.,
Payo M.R.,
Kerschaver E.V.,
Poortmans J.,
Mertens R.,
Beaucarne G.,
Schmich E.,
Lindekugel S.,
Reber S.
Publication year - 2010
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.953
Subject(s) - silicon , materials science , substrate (aquarium) , epitaxy , porous silicon , optoelectronics , layer (electronics) , photolithography , monocrystalline silicon , energy conversion efficiency , solar cell , doping , nanocrystalline silicon , thin film , optics , crystalline silicon , nanotechnology , amorphous silicon , physics , oceanography , geology
We report on the beneficial use of embedded segmented porous silicon broad‐band optical reflectors for thin‐film epitaxial silicon solar cells. These reflectors are formed by gradual increase of the spatial period between the layer segments, allowing for an enhanced absorption of low energy photons in the epitaxial layer. By combining these reflectors with well‐established solar cell processing by photolithography, a conversion efficiency of 15·2% was reached on 73 cm 2 area, highly doped offspec multicrystalline silicon substrates. The corresponding photogenerated current densities ( J sc ) were well above 31 mA/cm 2 for an active layer of only 20 µm. Copyright © 2010 John Wiley & Sons, Ltd.