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Room Temperature Fabricated ZnO:Al with Elevated and Unique Light-Trapping Performance

Published online by Cambridge University Press:  20 June 2011

E. V. Johnson
Affiliation:
LPICM-CNRS, Ecole Polytechnique, 91128 Palaiseau, France
C. Charpentier
Affiliation:
LPICM-CNRS, Ecole Polytechnique, 91128 Palaiseau, France TOTAL S.A. - Gas & Power, R&D Division, Tour La Fayette - 2 Place des Vosges - La Défense 6, 92 400 Courbevoie, France
T. Emeraud
Affiliation:
PV BU, EXCICO Group NV, Kempischesteenweg 305 bus 2, B-3500 Hasselt, Belgium
J.F. Lerat
Affiliation:
PV BU, EXCICO Group NV, Kempischesteenweg 305 bus 2, B-3500 Hasselt, Belgium
C. Boniface
Affiliation:
Process & Application Team, EXCICO France SAS, 13-21 Quai des Gresillons, F-92230 Gennevilliers, France
K. Huet
Affiliation:
Process & Application Team, EXCICO France SAS, 13-21 Quai des Gresillons, F-92230 Gennevilliers, France
P. Prod’homme
Affiliation:
TOTAL S.A. - Gas & Power, R&D Division, Tour La Fayette - 2 Place des Vosges - La Défense 6, 92 400 Courbevoie, France
P. Roca i Cabarrocas
Affiliation:
LPICM-CNRS, Ecole Polytechnique, 91128 Palaiseau, France
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Abstract

We present a novel ZnO:Al fabrication process consisting of room-temperature vacuum sputtering followed by an excimer laser annealing (ELA). The ELA treatment improves the optical transmission of the films, and the film resistivities (<1 mΩ·cm) remain stable or improve with increasing laser fluence up to 0.6 J/cm2, as the carrier density increases but the carrier mobility is degraded. This process is followed by a standard dilute HCl chemical texturing step, and produces substrates with suitable texture, conductivity, and transparency properties for thinfilm photovoltaic applications. Substrates resulting from this process display elevated haze levels (80% at 600 nm and 50% at 800 nm) after the wet-chemical etching step. Such substrates have been used to make single junction hydrogenated nanocrystalline silicon solar cells, and an increase in the short-circuit current of up to 2.2 mA/cm2 is observed compared to a substrate deposited by a standard room-temperature sputtering + wet-etch process. This gain is primarily due to increased photo-response in the red due to improved light-scattering, as at wavelengths greater than 600 nm, a gain in photocurrent of up to 1.7 mA/cm2 is observed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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