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Organic electronic materials have potential applications in a number oflow-cost, large area electronic devices such as flat panel displays andinexpensive solar panels. Small molecules in the series Anthracene, Tetracene,Pentacene, are model molecules for organic semiconductor thin films to be usedas the active layers in such devices. This has motivated a number of studies ofpolyacene thin film growth and structure. Although the majority of thesestudies rely on vapor-deposited films, solvent-based deposition of films withimproved properties onto non-crystalline substrates is desired for industrialproduction of devices. Improved ordering in thin films will have a large impacton their electronic properties, since grain boundaries and other defects aredetrimental to carrier mobilities and lifetimes. Thus, a long-standingchallenge in this field is to prepare largearea single crystal films onarbitrary substrates. Here we demonstrate a solvent-based method to depositthin films of organic semiconductors, which is very general. Anthracene thinfilms with single-crystal domain sizes exceeding 1x1 cm2 can be prepared onvarious substrates by the technique. Films of6,13-bis(triisopropylsilylethynyl)pentacene are also demonstrated to have grainsizes larger than 2x2 mm2. In contrast, films produced by conventional meanssuch as vapor deposition or spin coating are polycrystalline with micron-scalegrain sizes. The general propensity of these small molecules towardscrystalline order in an optimized solvent deposition process shows that thereis great potential for thin films with improved properties. Films prepared bythese methods will also be useful in exploring the limits of performance inorganic thin film devices.

Growth of macroscopic-area single crystal polyacene thin films on arbitrary substrates