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Local mapping of the oxygen-boron complex in 2×2 cm2 and 10×10 cm2 high-efficiency CZ-SI solar cells by lock-in thermography and LBIC

: Rakotoniaina, J.P.; Breitenstein, O.; Zhao, J.; Wang, A.; Green, M.A.; Rein, S.; Glunz, S.W.

Fulltext urn:nbn:de:0011-n-1721844 (396 KByte PDF)
MD5 Fingerprint: 41c1dfd70f9962fa94daadee6999f8fe
Created on: 26.10.2012

IEEE Electron Devices Society:
29th IEEE Photovoltaic Specialists Conference 2002. Proceedings : May 20-24, 2002 Hyatt Regency New Orleans New Orleans, Louisiana
New York, NY: IEEE, 2002
ISBN: 0-7803-7471-1
Photovoltaic Specialists Conference <29, 2002, New Orleans/La.>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

If high efficiency solar cells made from Czochralski material are exposed to sunlight or forward bias, their performance degrades due to a rearrangement of complex which most probably contains oxygen and boron. This degradation, which can be reversed by annealing, is reflected not only in the solar cell parameters but also in the dark I-V characteristics. We have imaged the dark forward current across a 4 cm2 cell and a 100 cm2 cell containing striations by lock-in thermography after annealing the cell at 200°C and after degrading it for 24 hrs. The difference between these two images corresponds to the local action of the B-O complex. We have found that this complex is distributed homogeneously across both cells, and that some observed weak local shunts do not show any recombination-induced degradation. Especially, the striation pattern in the 100 cm2 cell did not react on degradation and annealing.