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Comparison of organic and inorganic layers for structural templating of pentacene thin films

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Abstract

Pentacene is a key organic semiconductor, which has achieved prominence in transistor applications and as an archetypal material for singlet fission, the process whereby the absorption of one photon leads to the formation of two triplet states. Functional properties of molecules are highly anisotropic, and control over the molecular orientation in thin films with structural templating is commonly implemented as a route for governing the morphology and structure of organic films. Among the structural templating layers, 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and copper(I) iodide (CuI) have been shown to effectively template aromatic systems such as phthalocyanines. Here, we extend their use to pentacene thin films and find that a successful transition to a flat-lying arrangement is achieved with CuI films grown at high temperatures, but not with PTCDA. As a result, we postulate a model based on quadrupole interactions as the driving force behind the molecular orientation of pentacene. A 0.25 eV increase in work function and a two-fold increase in visible light absorption are recorded for the induced flat-lying orientation. Therefore, our templating methodology provides design opportunities for optoelectronic devices that require a predominantly flat-lying orientation.

Graphical abstract: Comparison of organic and inorganic layers for structural templating of pentacene thin films

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Publication details

The article was received on 08 Mar 2019, accepted on 22 Jul 2019 and first published on 30 Jul 2019


Article type: Communication
DOI: 10.1039/C9MH00355J
Mater. Horiz., 2019, Advance Article

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    Comparison of organic and inorganic layers for structural templating of pentacene thin films

    D. K. Kim, D. Lubert-Perquel and S. Heutz, Mater. Horiz., 2019, Advance Article , DOI: 10.1039/C9MH00355J

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