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Understanding the spatial composition inhomogeneity in CIGS solar cells can provide insight into a potentially large cause of decreased cell efficiency. We used synchrotron based nano x-ray fluorescence and nano x-ray beam induduced current to investigate the correlation between grain-to-grain compositional variations in Cu(In,Ga)Se2 absorber layers and variations in carrier collection efficiency...
Infrared lock-in thermography not only allows one to image shunts very sensitively in all kinds of solar cells, but also to measure dark currents flowing in certain regions of the cell quantitatively. After dealing with the physical basics of quantitative lock-in thermography, three types of measurements are described: 1. the quantitative measurement of the I-V characteristic of a point shunt, 2....
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