Fabrication of organic semiconductor crystalline thin films and crystals from solution by confined crystallization |
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Authors: | Hylke B AkkermanAlice C Chang Eric Verploegen Christopher J Bettinger Michael F ToneyZhenan Bao |
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Affiliation: | a Stanford University, Department of Chemical Engineering, Stauffer III, 381 North-South Mall, Stanford, CA 94305-5025, USA b Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Rd., Menlo Park, CA 94025, USA |
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Abstract: | Highly crystalline thin films of organic semiconductors processed from solution for electronic devices are difficult to achieve due to a slow and preferential three-dimensional growth of the crystals. Here we describe the development of a processing technique to induce a preferential two-dimensional crystalline growth of organic semiconductors by means of minimizing one dimension and confining the solution in two dimensions into a thin layer. The versatility of the process is demonstrated by processing small molecules (TIPS-pentacene and C60) and a polymer (P3HT), all from solvents with a relatively low boiling point, to obtain crystalline thin films. The thin films show an improved in-plane packing of the molecules compared to films processed under similar conditions by spin coating, which is beneficial for the use in organic field-effect transistors. |
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Keywords: | Organic electronics Field-effect transistors Crystals Crystalline thin films Single-crystal devices TIPS-pentacene |
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