A method for rapid, mass-efficient deposition of highly crystalline organic films under near ambient conditions of pressure and temperature is reported based on delivery of an organic precursor via an impinging gas jet to a substrate coated by a thin liquid solvent layer. Films of the organic semiconductor tetracene were deposited by sublimation into a flow of argon carrier gas directed at an indium-tin-oxide/glass substrate coated by a thin layer of bis(2-ethylhexyl)sebecate, and growth was followed in situ with optical microscopy. A fluid dynamics model is applied to account for the gas phase transport and aggregation, and the results compared to experiment. The combination of gas jet delivery with an organic-vapor-liquid-solid growth mechanism leads to larger crystals and lower nucleation densities than on bare surfaces, with markedly different nucleation and growth kinetics. An explanation based on enhanced solution-phase diffusivity and a larger critical nucleus size in the liquid layer is proposed to account for the differences.
Journal of Applied Physics
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© 2012 American Institute of Physics. View original version at Journal of Applied Physics.
Shaw, Daniel W. (Daniel Wainwright); Bufkin, Kevin A. (Kevin Anthony); Baronov, Alexandr A.; Johnson, Brad L.; and Patrick, David L., "Organic-Vapor-Liquid-Solid Deposition with an Impinging Gas Jet" (2012). Chemistry Faculty and Staff Publications. 2.
Subjects - Topical (LCSH)
Organic thin films--Effect of temperature on; Vapor-plating; Liquid crystalline solvents