Accurate series resistance measurement of solar cells
Article first published online: 20 NOV 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Progress in Photovoltaics: Research and Applications
Volume 21, Issue 4, pages 490–499, June 2013
How to Cite
Fong, K. C., McIntosh, K. R. and Blakers, A. W. (2013), Accurate series resistance measurement of solar cells. Prog. Photovolt: Res. Appl., 21: 490–499. doi: 10.1002/pip.1216
- Issue published online: 23 MAY 2013
- Article first published online: 20 NOV 2011
- Manuscript Accepted: 5 SEP 2011
- Manuscript Revised: 25 JUL 2011
- Manuscript Received: 13 APR 2011
- series resistance;
- resistance loss;
- solar cell
The series resistance (Rs) of a solar cell is commonly represented as a constant resistance value. However, because of the distributed nature of series resistance, the effective lumped Rs vary with current density and illumination intensity. Treating Rs as a constant is usually insufficient for an accurate analysis of its J–V curve. This work first presents a review of the distributed nature of series resistance and commonly applied methods to measure Rs. Particular attention is given to the multi-light method (MLM) and it is discussed in detail, where Rs in both the light and dark can be measured as a function of current by extracting Rs from a set of current–voltage (J–V) curves attained at different illumination intensities. The principle behind this method is discussed, and the results are then compared with those of other known methods of Rs measurement. The accurate measurement of Rs(J) attained with the MLM permits the extraction of an Rs-corrected J–V curve, which is theoretically more accurate than that attained by alternative methods because of negligible error from injection dependence and spectral mismatch. With the solar cell equation modified to include Rs(J), we attain a much better fit to experimental data, finding a significant reduction in error compared with using a constant Rs. Copyright © 2011 John Wiley & Sons, Ltd.