Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Accurate determination of the IQE of screen printed silicon solar cells by accounting for the finite reflectance of metal contacts

: Thaidigsmann, B.; Wolf, A.; Biro, D.

Fulltext urn:nbn:de:0011-n-1436163 (348 KByte PDF)
MD5 Fingerprint: 75a87a322792061a7b26c3eaa42673df
Created on: 11.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

The internal quantum efficiency (IQE) of a solar cell follows from the external quantum efficiency (EQE) and reflectance data of the front side. Most of the silicon solar cells currently produced feature metallised areas on the front. To account for the finite reflection of the metal grid, the reflection of the non-metallised area has to be extracted from the reflection data. Our results show that neglecting the finite reflection of the front metallisation results in a misinterpretation of the IQE by up to 9 % (relative). We show that the impact of the metallisation on the front reflectance scales linearly with the surface ratio of the metallisation and present a method to extract the reflectance of non-metallised areas from large-area reflectance measurements of screen printed solar cells. Our approach uses an algorithm to automatically determine the metallised surface area by means of microscope images and reference measurements of fully metallised samples to calculate the required reflectance data. This way the accuracy of the IQE is significantly improved.