Miniaturized organic single-crystal
arrays that are addressed by
reading-out circuits are crucial for high performance and high-level
integration organic electronics. Here, we report a lithography compatible
strategy to fabricate organic single-crystal arrays via area-selective
growth and solvent vapor annealing (SVA). The organic semiconducting
molecules can first selectively grow on photographically patterned
drain-source electrodes, forming ordered amorphous aggregates that
can further be converted to discrete single-crystal arrays by SVA.
This strategy can be applied to self-align the microsized organic
single crystals on predesigned locations. With this method, suppression
of cross-talk among devices, organic field-effect transistors, and
basic logic gate arrays with reading-out electrodes are further demonstrated.
In this work, high‐resolution flexible micro‐organic light‐emitting diodes (micro‐OLEDs) are presented by template‐directed growth. The templates are prepared by parallel patterning techniques (nanotransfer printing and photolithography) to create prepatterns on flexible substrates. The prepatterns act as nucleation sites and induce area‐selective growth of organic semiconductor molecules upon deposition. By optimization of growth parameters such as substrate temperature and growth rate, uniform patterns of diverse light‐emitting materials can be realized with feature sizes down to hundreds of nanometers, including orange, blue, and green emissions on the flexible substrates. Flexible micro‐OLEDs are further demonstrated based on the patterned organic semiconductors. By combination of parallel patterning techniques, this work provides a high yield and resolution patterning way for flexible organic electronics over large areas.
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