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Photoluminescence-based current-voltage characterisation of individual subcells in multi-junction devices

 
: Alsonso-Álvarez, D.; Lackner, D.; Philipps, S.P.; Bett, A.W.; Ekins-Daukes, N.J.

:
Fulltext urn:nbn:de:0011-n-3791157 (1.1 MByte PDF)
MD5 Fingerprint: c084b206c003daee29444bffba76bf5f
Created on: 5.3.2016


European Commission:
31st European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2015 : 14 to 18 September 2015, Hamburg, Germany
Hamburg, 2015
ISBN: 3-936338-39-6
pp.1509-1513
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <31, 2015, Hamburg>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; III-V und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen; Konzentrator-Bauelemente; semiconductors; solar cell; characterization; photoluminescence

Abstract
We demonstrate a photoluminescence based, contactless method to determine the current-voltage characteristics of the individual subcells in a multi-junction solar cell. The method, furthers known results for single junction devices and relies upon the reciprocity relation between the absorption and emission properties on a solar cell. Laser light with a suitable energy is used to excite carriers selectively in one junction and the internal voltages are deduced from the intensity of the resulting luminescence. The IV curves obtained this way on 1J, 2J and 6J devices are compared to those obtained using electroluminescence. Good agreement is obtained at high injection conditions while discrepancies at low injection are attributed to in-plane carrier transport.

: http://publica.fraunhofer.de/documents/N-379115.html