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Proceedings Paper

A novel light trapping concept for liquid phase crystallized poly-Si thin-film solar cells on periodically nanoimprinted glass substrates
Author(s): V. Preidel; D. Amkreutz; T. Sontheimer; F. Back; E. Rudigier-Voigt; B. Rech; C. Becker
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Paper Abstract

Large grained polycrystalline silicon (poly-Si) absorbers were realized by electron beam induced liquid phase crystallization on 2 μm periodically patterned glass substrates and processed into a-Si:H/poly-Si heterojunction thin-film solar cells. The substrates were structured by nanoimprint lithography using a UV curable hybrid polymer sol-gel resist, resulting in a glassy high-temperature stable micro-structured surface. Structural analysis yielded high quality poly-Si material with grain sizes up to several hundred micrometers. An increase of absorption and an enhancement of the external quantum efficiency in the NIR as a consequence of light trapping due to the micro-structured poly-Si/substrate interface were observed. Up to now, only moderate solar cell parameters, a maximum open-circuit voltage of 413 mV and a short-circuit current density of 8 mA cm-2, were measured being significantly lower to what can be achieved with liquid phase crystallized poly-Si thin-film solar cells on planar glass substrates indicating that the substrate texture has impact on the electrical material quality. By reduction of the SiC interlayer thickness at the micro-structured poly- Si/substrate interface defect-related parasitic absorption was considerably minimized. This encourages the implementation of nanoimprinted tailored substrate textures for light trapping in liquid phase crystallized poly-Si thinfilm solar cells.

Paper Details

Date Published: 11 September 2013
PDF: 6 pages
Proc. SPIE 8823, Thin Film Solar Technology V, 882307 (11 September 2013); doi: 10.1117/12.2023989
Show Author Affiliations
V. Preidel, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
D. Amkreutz, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
T. Sontheimer, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
F. Back, SCHOTT AG (Germany)
E. Rudigier-Voigt, SCHOTT AG (Germany)
B. Rech, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
C. Becker, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)


Published in SPIE Proceedings Vol. 8823:
Thin Film Solar Technology V
Louay A. Eldada; Michael J. Heben, Editor(s)

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