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Spatially resolved IR-measurement techniques for solar cells

: Isenberg, J.; Riepe, S.; Schubert, M.C.; Glunz, S.W.; Warta, W.

Volltext urn:nbn:de:0011-n-2096452 (1.9 MByte PDF)
MD5 Fingerprint: 47cbbc50fa28d2cf257a3993b4d34c50
Erstellt am: 26.10.2012

Hoffmann, W.:
Nineteenth European Photovoltaic Solar Energy Conference 2004. Vol.1 : Proceedings of the international conference held in Paris, France, 7 - 11 June 2004
München: WIP, 2004
ISBN: 3-936338-14-0
ISBN: 88-89407-02-6
European Photovoltaic Solar Energy Conference <19, 2004, Paris>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

The article gives an overview over developments in the area of characterization tools for solar cells using CCD-cameras sensitive in the IR. Additionally, the prospects for the application of these measurement systems in In-Line and Off-Line process control will be addressed. The methods discussed include Dark and Illuminated Lock-In Thermography (DLT and ILT), Carrier Density Imaging (CDI) and Sheet Resistance Imaging (SRI). The two thermography-methods allow a spatially resolved investigation of leakage currents and power losses in solar cells under dark and illuminated conditions, respectively. CDI is the first measurement technique that provides a lifetime image with good spatial resolution within a few seconds to minutes and SRI permits the same quality and speed of measurements for the sheet resistance of solar cell emitters. All these techniques apply a CCD-camera sensitive in the IR and were developed to a state applicable in routine Off-Line cell characterization. An important common feature of all of them is that an imaging method replaces scanning the sample for obtaining good spatial resolution. Thus measurement times are significantly reduced as compared to previous setups, typically by a factor of 100 or above.