Figure 2.

SEM images. (a) The surface of a CIGS layer, (b) the surface of a CIGS/P3HT:PCBM bilayer, and (c) the cross-section of the CIGS/P3HT:PCBM bilayer. The CIGS layers were deposited at a substrate temperature of 400°C for 3 min.

Zhao et al. Nanoscale Research Letters 2014 9:308   doi:10.1186/1556-276X-9-308
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