Journal
THIN SOLID FILMS
Volume 517, Issue 7, Pages 2554-2557Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.11.064
Keywords
Cu(In,Ga)Se-2; EBIC; Grain boundaries
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Electron backscatter diffraction (EBSD) in combination with electron beam-induced current (EBIC) measurements in a scanning electron microscope were used to investigate grain boundaries in Cu(In,Ga) Se-2 thin-film solar cells. The measurements were performed on polished cross sections of working devices. EBIC maps enable the analysis of charge-carrier collection with a high spatial resolution and the extraction of the local minority charge-carrier diffusion length. EBSD images reveal the microstructure of the Cu(In,Ga)Se-2 absorber-layer. A combination of these techniques makes it possible to investigate the influence of the microstructure of the Cu(In,Ga)Se-2 absorber-layer and especially of grain boundaries on charge-carrier collection. It is shown that collection properties are grain specific and that there are positions of grain boundaries exhibiting a reduced EBIC signal. These grain boundaries might be regions of enhanced recombination with a recombination velocity of about 1 X 10(4) cm/s. (C) 2008 Elsevier B.V. All rights reserved.
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