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Improved grating monochromator set-up for EQE measurements of multi-junction solar cells

: Siefer, G.; Gandy, T.; Schachtner, M.; Wekkeli, A.; Bett, A.W.

Postprint urn:nbn:de:0011-n-2838542 (402 KByte PDF)
MD5 Fingerprint: 6de9366e606f7721ed2304a52c020f1b
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Created on: 1.5.2015

Institute of Electrical and Electronics Engineers -IEEE-; IEEE Electron Devices Society; Institute of Electrical and Electronics Engineers -IEEE-, Power & Energy Society -PES-:
39th IEEE Photovoltaic Specialists Conference, PVSC 2013 : Tampa, Florida, USA, 16.06.2013-21.06.2013
Piscataway, NJ: IEEE, 2013
ISBN: 978-1-4799-3299-3
Photovoltaic Specialists Conference (PVSC) <39, 2013, Tampa/Fla.>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; III-V und Konzentrator-Photovoltaik; alternative Photovoltaik-Technologie; III-V Epitaxie und Solarzellen; Solarzelle und Bauelement; cells; Concentrator Cells; external quantum efficiency; characterization

Grating monochromator set-ups are widely in use for the measurement of the external quantum efficiency (EQE) of solar cells. This paper describes the grating monochromator setup for EQE measurements of multi-junction and concentrator cells at the calibration laboratory (ISE CalLab) at Fraunhofer ISE. The set-up has been updated with innovative features. This includes an optional LED based bias illumination system which is of particular interest for the measurement of multi-junction cells whose subcells show narrow or overlapping absorption bands. Additionally the set-up has been improved in order to allow for the reliable EQE measurement of concentrator cells with areas below 1 mm2. Moreover, the set-up has been modified to measure the I-V-curve of the solar cell under bias light condition. In the case of multi-junction cells this allows to retrieve information about the shape of the I-V-curves of the individual subcells. Low temperature EQE measurements can be performed by replacing the measurement chuck through a cryostat.