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Solar Cell Contacts Using Nano-Sized Dispersions

Published online by Cambridge University Press:  21 February 2011

Doug Schulz
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
R. Ribelin
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
X. Wu
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
K.M. Jones
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
R.J. Matson
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
C.J. Curtis
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
T. Gessert
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
D.S. Ginley
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA 80401-3393
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Abstract

Nano-sized dispersions have been employed as precursor inks for the spray deposition of contacts to both Si and CdTe materials. In the case of Si, nano-sized Al particles (nano-Al) were dispersed and spray deposited onto p-type Si. Annealing above the eutectic temperature causes alloy formation yielding a p+ layer with p ∼ 10−4 Ω•cm. For CdTe, nano-sized Te particles (nano-Te) were dispersed and sprayed onto CdTe/CdS/SnO2/glass heterostructures. Contact to the CdTe layer occurred during a 30 min anneal in He (T = 215 to 255 °C). These solar cells were finished by spin-coating the Te layer with Ag paint and subsequently annealing in air (100 °C / 1 h). This approach produces solar cells with open circuit voltages (Voc) from 720 to 800 mV, short circuit current densities (Jsc) from 18 to 20 mA/cm2 and efficiencies up to 10.3%. The performance of these cells was similar to those produced using the standard NREL contact.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

1. Rose, D.H., Hasoon, F.S., Dhere, R.G., Albin, D.S., Ribelin, R.M., Li, X.S., Mahathongdy, Y., Gessert, T.A., Sheldon, P., Prog. Photovoltaics: Res. Appl, 7 (5), 331340 (1999).3.0.CO;2-P>CrossRefGoogle Scholar
2. Schulz, D.L., Ribelin, R., Curtis, C.J., Ginley, D.S., AIP Conf. Proc., 462, 206211 (1999).CrossRefGoogle Scholar
3. Romeo, N., Bosio, A., Tedeschi, R., Canevari, V., presented at the 1998 World Conference and Exhibition on Photovoltaic Solar Energy Conversion, Vienna, Austria, 1998.Google Scholar
4. Niles, D.W., Li, X., Albin, D., Rose, D., Gessert, T., Sheldon, P., Prog. Photovoltaics: Res. Appl, 4, 225229 (1996).3.0.CO;2-6>CrossRefGoogle Scholar

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