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Title:
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Soft imprinted Ag nanowire hybrid electrodes on silicon heterojunction solar cells
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Author(s):
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Knight, M.W.; Groep, J. van de; Bronsveld, P.C.P.; Sinke, W.C.; Polman, A.
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Published by:
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Publication date:
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ECN
Solar Energy
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13-10-2016
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ECN report number:
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Document type:
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ECN-W--15-034
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Article (scientific)
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Number of pages:
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9
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Published in: Nano Energy (Elsevier), , 2016, Vol.30, p.398-406.
Abstract:
We demonstrate enhanced efficiencies in front-contacted silicon heterojunction (SHJ) solar cells using silver nanowire-based hybrid electrodes. SHJ cells typically suffer from shading losses due to reflection from macroscopic sun-facing metal fingers, which must be closely spaced to avoid resistive losses in the transparent conductive electrode (TCE). Using substrate conformal imprint lithography (SCIL) we fabricate silver nanowire electrodes on practical scale (4.0 cm2) planar SHJ cells. These electrodes exhibit anomalous transmission and a 7-fold improvement in sheet conductance relative to a standard ITO layer, enabling larger finger spacings and
reducing reflection losses without compromising the cell fill factor. Over 70% of the ITO is replaced with transparent SiNx, reducing the use of indium while improving the anti-reflective performance. Combined, the reduced shading and reflection raises the short circuit current density increases by 2.1 mA cm-2, yielding an absolute increase in cell efficiency of 1.0%. These engineered hybrid electrodes provide a practical pathway towards front-contacted SHJ cells with a reduced dependence on rare metals and high efficiencies.
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