Abstract
The crystallization and film formation of organic semiconductors are controlled by the meniscus shape during meniscus guided coating for field-effect transistors.
Highlights
According to the relation between the coating speed and the resulting film thickness, Meniscus-guided coating (MGC) is classified into two deposition regimes, evaporation and Landau–Levich, with an additional transition region as the mixed regime.[6]
During MGC of organic semiconductors (OSCs), the meniscus refers to the liquid shape between the substrate and coating head or bulk solution, which is determined by a combination of surface tension and external forces.[29]
We have demonstrated the crucial role of the meniscus shape in the fluid flow and crystallization of a small molecule OSC during MGC
Summary
According to the relation between the coating speed and the resulting film thickness, MGC is classified into two deposition regimes, evaporation (or capillary) and Landau–Levich (or Landau–Levich–Derjaguin), with an additional transition region as the mixed regime.[6]. It is observed that at small meniscus angle the concentration gradient and mass deposition of the solute are increased, leading to improved film morphology and charge carrier transport in field-effect transistors.
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