IRUS Total

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

File Description SizeFormat 
MH-COM-03-2019-000355_Manuscript Revised_second review.pdfAccepted version1.54 MBAdobe PDFView/Open
Title: Comparison of organic and inorganic layers for structural templating of pentacene thin films
Authors: Kim, DK
Lubert-Perquel, D
Heutz, S
Item Type: Journal Article
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 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.
Issue Date: 1-Jan-2020
Date of Acceptance: 22-Jul-2019
URI: http://hdl.handle.net/10044/1/71819
DOI: 10.1039/C9MH00355J
ISSN: 2051-6355
Publisher: Royal Society of Chemistry
Start Page: 289
End Page: 298
Journal / Book Title: Materials Horizons
Volume: 7
Issue: 1
Copyright Statement: © The Royal Society of Chemistry 2019
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/L015277/1
Publication Status: Published
Online Publication Date: 2019-07-30
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering