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a-Si:H/µc-Si:H tandem junction based photocathodes with high open-circuit voltage for efficient hydrogen production

Urbain, Félix and Smirnov, Vladimir and Becker, Jan-Philipp and Rau, Uwe and Finger, Friedhelm and Ziegler, Jürgen and Kaiser, Bernhard and Jaegermann, Wolfram (2014):
a-Si:H/µc-Si:H tandem junction based photocathodes with high open-circuit voltage for efficient hydrogen production.
29, In: Journal of Materials Research, (22), Cambridge University Press, pp. 2605-2614, ISSN 0884-2914, [Online-Edition: http://dx.doi.org/10.1557/jmr.2014.308],
[Article]

Abstract

Thin film silicon tandem junction solar cells based on amorphous silicon (a-Si:H) and microcrystalline silicon (µc-Si:H) were developed with focus on high open-circuit voltages for the application as photocathodes in integrated photoelectrochemical cells for water electrolysis. By adjusting various parameters in the plasma enhanced chemical vapor deposition process of the individual µc-Si:H single junction solar cells, we showed that a-Si:H/µc-Si:H tandem junction solar cells exhibit open-circuit voltage over 1.5 V with solar energy conversion efficiency of 11% at a total silicon layer thickness below 1 µm. Our approach included thickness reduction, controlled SiH4 profiling, and incorporation of intrinsic interface buffer layers. The applicability of the tandem devices as photocathodes was evaluated in a photoelectrochemical cell. The a-Si:H/µc-Si:H based photocathodes exhibit a photocurrent onset potential of 1.3 V versus RHE and a short-circuit photocurrent of 10.0 mA/cm2. The presented approach may provide an efficient and low-cost pathway to solar hydrogen production.

Item Type: Article
Erschienen: 2014
Creators: Urbain, Félix and Smirnov, Vladimir and Becker, Jan-Philipp and Rau, Uwe and Finger, Friedhelm and Ziegler, Jürgen and Kaiser, Bernhard and Jaegermann, Wolfram
Title: a-Si:H/µc-Si:H tandem junction based photocathodes with high open-circuit voltage for efficient hydrogen production
Language: English
Abstract:

Thin film silicon tandem junction solar cells based on amorphous silicon (a-Si:H) and microcrystalline silicon (µc-Si:H) were developed with focus on high open-circuit voltages for the application as photocathodes in integrated photoelectrochemical cells for water electrolysis. By adjusting various parameters in the plasma enhanced chemical vapor deposition process of the individual µc-Si:H single junction solar cells, we showed that a-Si:H/µc-Si:H tandem junction solar cells exhibit open-circuit voltage over 1.5 V with solar energy conversion efficiency of 11% at a total silicon layer thickness below 1 µm. Our approach included thickness reduction, controlled SiH4 profiling, and incorporation of intrinsic interface buffer layers. The applicability of the tandem devices as photocathodes was evaluated in a photoelectrochemical cell. The a-Si:H/µc-Si:H based photocathodes exhibit a photocurrent onset potential of 1.3 V versus RHE and a short-circuit photocurrent of 10.0 mA/cm2. The presented approach may provide an efficient and low-cost pathway to solar hydrogen production.

Journal or Publication Title: Journal of Materials Research
Volume: 29
Number: 22
Publisher: Cambridge University Press
Uncontrolled Keywords: photovoltaic, photochemical, Si
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 27 Feb 2015 12:44
Official URL: http://dx.doi.org/10.1557/jmr.2014.308
Identification Number: doi:10.1557/jmr.2014.308
Funders: The research is partly financially supported by the Deutsche Forschungsgemeinschaft (DFG) Priority Programme 1613: , Regeneratively produced fuels by light driven water splitting: Investigation of involved elementary processes and perspectives of technologic implementation, , and by the Bundesministerium für Bildung und Forschung (BMBF) in the network project: Sustainable Hydrogen (FKZ 03X3581B).
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