Figure 3.

SEM images of deposited C60films and P3HT/C60heterojunction. SEM images of (a) C60 film deposited on P3HT pillars, (b) C60 film deposited on a flat substrate, and (c) cross section of P3HT/C60 heterojunction, proving full infiltration of C60 between P3HT pillars.

Hu et al. Nanoscale Research Letters 2012 7:469   doi:10.1186/1556-276X-7-469
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