Figure 1.

XTEM images of each interface. (a) the interface between the CdS buffer; (b) the CIGS absorber layers for the Na-restricted device and the Na-incorporated device; the interface between the CIGS absorber layers and the Mo back contact layers for (c) the Na-restricted device; (d) the Na-incorporated device.

Jeong et al. Nanoscale Research Letters 2011 6:581   doi:10.1186/1556-276X-6-581
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