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Quantitative Defect Analysis on Solar Cells by Laser Beam Induced Current (LBIC) Measurements and 3D Network Simulations

Published online by Cambridge University Press:  26 February 2013

Minh Nguyen ,
Andreas Schütt ,
Jürgen Carstensen  and
Helmut Föll
Minh Nguyen
Affiliation:
Corporate Research, Robert Bosch GmbH, Stuttgart, Germany Institute for Materials Science, Christian-Albrechts-University, Kiel, Germany
Andreas Schütt
Affiliation:
Institute for Materials Science, Christian-Albrechts-University, Kiel, Germany
Jürgen Carstensen
Affiliation:
Institute for Materials Science, Christian-Albrechts-University, Kiel, Germany
Helmut Föll
Affiliation:
Institute for Materials Science, Christian-Albrechts-University, Kiel, Germany
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Abstract

Measurements with the CELLO (solar cell local characterization) technique in the LBIC (laser beam induced current) mode under dark conditions with various constant bias voltages are used to analyze the lateral distribution, and mean values, of photocurrent response maps. Local solar cell defects such as local shunts were found to have a characteristic bias voltage dependence: At negative and small positive voltages a local shunt resistance gives less current response than the adjacent area. Upon applying higher positive voltages, a transition of the mean value to lower current response and an inversion of the local defect characteristics are found. These results were modeled by a newly introduced three dimensional (3D) equivalent circuit model of a solar cell divided into subcells.

Measurements and simulations of solar cells with various local defects show our method to be a new powerful tool for the quantitative analysis of local solar cell defects.

Keywords

photovoltaicsimulationthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1493: Symposium E/H – Photovoltaic Technologies, Devices and Systems Based on Inorganic Materials, Small Organic Molecules and Hybrids , 2013 , pp. 195 - 200
Copyright
Copyright © Materials Research Society 2013 

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References

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