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We present methods for nanostructuring organic thin films for organic photovoltaic (OPV) devices. Using the glancing
angle deposition (GLAD) technique, we fabricate a variety of columnar morphologies of metal phthalocyanine (MPc)
materials that can be used as structured donor layers in OPV devices. We leverage this capability with block copolymer
surface patterning techniques to achieve perfectly periodic columnar arrays while providing additional control over
column dimensions, spacing, and density. Our investigation employs hexagonal seed patterns of platinum on silicon and
we vary the seed spacing between 40 nm and 60 nm. We find that pattern resemblance begins to fade when the film
thickness exceeds the seed spacing. We compare the film evolution between vertical post and slanted post morphologies,
and use advanced substrate motion techniques to constrain column diameters. We conclude by addressing the
compatibility of surface patterning with device fabrication. Patterned ITO surfaces and SiO2 seed patterns are shown.
Jaron G. Van Dijken,Nathanael L.-W. Wu,Michael D. Fleischauer,Jillian M. Buriak, andMichael J. Brett
"Morphology control and nanoscale patterning of small molecule organic thin films", Proc. SPIE 8435, Organic Photonics V, 84350R (30 April 2012); https://doi.org/10.1117/12.922659
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Jaron G. Van Dijken, Nathanael L.-W. Wu, Michael D. Fleischauer, Jillian M. Buriak, Michael J. Brett, "Morphology control and nanoscale patterning of small molecule organic thin films," Proc. SPIE 8435, Organic Photonics V, 84350R (30 April 2012); https://doi.org/10.1117/12.922659