Controlling
Interface Morphology and Layer Crystallinity in Organic Heterostructures:
Microscopic View on C60 Island Formation on Pentacene Buffer
Layers
Posted on 2019-09-10 - 14:53
Controlling
the crystallinity of organic thin films is an important aspect in
the improvement of organic electronic devices. However, because of
high molecular mass, structural anisotropy, and weak intermolecular
van der Waals bonding, crystalline ordering is not easily accomplished.
While film preparation at elevated substrate temperature often improves
the crystalline quality, this approach cannot be applied to temperature-sensitive
materials such as plastic foils used as substrates for flexible electronics.
Here, we examine in detail a low-temperature approach to improve film
crystallinity by using ultrathin pentacene (PEN) buffer layers that
allow crystalline growth of buckminsterfullerene (C60)
thin films while without such buffer layers, only amorphous fullerene
films are formed upon room-temperature deposition on various support
substrates. Remarkably, this effect depends critically on the thickness
of the PEN buffer and requires a thickness of at least two monolayers
to induce crystalline growth, whereas a buffer layer consisting of
a monolayer of PEN again yields amorphous C60 films. Combining
crystallographic investigations by X-ray diffraction and atomic force
microscopy measurements, we determine distinct nucleation sites on
buffer layers of different thickness, which are correlated to the
amorphous, respectively crystalline C60 islands. Our microscopic
analysis reveals distinct differences for the nucleation and diffusivity
of fullerenes on the PEN monolayer and on thicker buffer layers, which
are attributed to the molecular arrangement in the PEN monolayer.
Finally, we show that the crystalline C60 films are exclusively
(111)-oriented and the fullerene islands are even heteroepitaxially
aligned on the PEN buffer.
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Huttner, Andrea; Breuer, Tobias; Witte, Gregor (2019). Controlling
Interface Morphology and Layer Crystallinity in Organic Heterostructures:
Microscopic View on C60 Island Formation on Pentacene Buffer
Layers. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b09369
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