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Electrical characterization of Al, Ag and In contacts on CuInS2 thin films deposited by spray pyrolysis

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3 Author(s)
Peza-Tapia, J.M. ; Dept. of Electr. Eng., CINVESTAV-IPN, Mexico City ; Morales-Acevedo, A. ; Ortega-Lopez, M.

The specific contact resistivity (rhoC) for Aluminum (Al), Silver (Ag) and Indium (In) metallic contacts on CuInS2 thin films have been determined, from I - V measurements, with the purpose of having the most appropriate ohmic contact for TCO/CdS/CuInS2 solar cells. rhoC was measured using the transmission line (TLM) method for the metallic contacts evaporated on CuInS2 thin films deposited by spray pyrolysis with ratios x = [Cu] / [In] = 1.0, 1.1, 1.3 and 1.5 in the spray solution. The results show that In contacts have the lowest rhoC values for CuInS2 samples grown with x = 1.5. The minimum rhoC was 0.26 ohm-cm2 for the In contacts. This value, although not very low, will allow the fabrication of CuInS2 solar cells with a small series resistance.

Published in:

Electrical Engineering, Computing Science and Automatic Control, 2008. CCE 2008. 5th International Conference on

Date of Conference:

12-14 Nov. 2008