Effect of Structure and Disorder on the Charge Transport in Defined Self-Assembled Monolayers of Organic Semiconductors

Schmaltz T, Gothe B, Krause A, Leitherer S, Steinrück HG, Thoss M, Clark T, Halik M (2017)


Publication Type: Journal article

Publication year: 2017

Journal

URI: https://pubs.acs.org/doi/abs/10.1021/acsnano.7b02394

DOI: 10.1021/acsnano.7b02394

Abstract

Self-assembled monolayer field-effect transistors (SAMFETs) are not only a promising type of organic electronic device but also allow detailed analyses of structure-property correlations. The influence of the morphology on the charge transport is particularly pronounced, due to the confined monolayer of 2D-\textgreekp-stacked organic semiconductor molecules. The morphology, in turn, is governed by relatively weak van-der-Waals interactions and is thus prone to dynamic structural fluctuations. Accordingly, combining electronic and physical characterization and time-averaged X-ray analyses with the dynamic information available at atomic resolution from simulations allows us to characterize self-assembled monolayer (SAM) based devices in great detail. For this purpose, we have constructed transistors based on SAMs of two molecules that consist of the organic p-type semiconductor benzothieno[3,2-b][1]benzothiophene (BTBT), linked to a C11 or C12 alkylphosphonic acid. Both molecules form ordered SAMs; however, our experiments show that the size of the crystalline domains and the charge-transport properties vary considerably in the two systems. These findings were confirmed by molecular dynamics (MD) simulations and semiempirical molecular-orbital electronic-structure calculations, performed on snapshots from the MD simulations at different times, revealing, in atomistic detail, how the charge transport in organic semiconductors is influenced and limited by dynamic disorder.

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APA:

Schmaltz, T., Gothe, B., Krause, A., Leitherer, S., Steinrück, H.-G., Thoss, M.,... Halik, M. (2017). Effect of Structure and Disorder on the Charge Transport in Defined Self-Assembled Monolayers of Organic Semiconductors. Acs Nano. https://dx.doi.org/10.1021/acsnano.7b02394

MLA:

Schmaltz, Thomas, et al. "Effect of Structure and Disorder on the Charge Transport in Defined Self-Assembled Monolayers of Organic Semiconductors." Acs Nano (2017).

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