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Proceedings Paper

Influence of TCO type on the performance of amorphous silicon solar cells
Author(s): Alan E. Delahoy; Alexander P. Stavrides; Anamika M. Patel; Loan T. Le; John A. Cambridge; Yue Xu; Sheyu Guo
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Paper Abstract

We have deposited textured ZnO:Al films over large areas using a reactive-environment hollow cathode sputtering (RE-HCS) system developed in house, and have achieved excellent carrier mobilities (up to 49.5 cm2/Vs at a carrier concentration of 4.42 x 1020/cm3). Both the electrical properties and optical properties (total transmission and haze) are superior to those exhibited by commercially available SnO2:F. Using these textured ZnO:Al films, we have achieved an a-Si:H solar cell efficiency boost of 8% relative to commercial SnO2:F superstrates which resulted from improvements in all three PV parameters, namely Voc, Jsc, and FF. We have also determined the dependence of cell performance on the degree of haze in the ZnO:Al films. Electrical, physical, and optical properties of ZnO:Al and SnO2:F, as determined by four-point probe, Hall effect, SEM, AFM, ICP, transmission (total and diffuse), and work function measurements are presented and correlated to the observed differences in a-Si solar cell performance. We have also developed a refractive index matching layer that, when inserted between the TCO and the a-Si:H layers, resulted in an increase in Jsc of 3%. Finally, we present some experiments on the effect of TCO type on nc-Si:H solar cell performance. From these experiments, we confirmed that SnO2:F by itself is not a suitable TCO for nc-Si:H cells, but found that SnO2:F overcoated with TiO2 followed by ZnO was the most effective superstrate for this type of cell.

Paper Details

Date Published: 10 September 2008
PDF: 9 pages
Proc. SPIE 7045, Photovoltaic Cell and Module Technologies II, 704506 (10 September 2008); doi: 10.1117/12.796096
Show Author Affiliations
Alan E. Delahoy, EPV Solar, Inc. (United States)
Alexander P. Stavrides, EPV Solar, Inc. (United States)
Anamika M. Patel, EPV Solar, Inc. (United States)
Loan T. Le, EPV Solar, Inc. (United States)
John A. Cambridge, EPV Solar, Inc. (United States)
Yue Xu, EPV Solar, Inc. (United States)
Sheyu Guo, EPV Solar, Inc. (United States)


Published in SPIE Proceedings Vol. 7045:
Photovoltaic Cell and Module Technologies II
Bolko von Roedern; Alan E. Delahoy, Editor(s)

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