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Effect of molecular asymmetry on the charge transport physics of high mobility n-type molecular semiconductors investigated by scanning Kelvin probe microscopy

Effect of molecular asymmetry on the charge transport physics of high mobility n-type molecular semiconductors investigated by scanning Kelvin probe microscopy
Effect of molecular asymmetry on the charge transport physics of high mobility n-type molecular semiconductors investigated by scanning Kelvin probe microscopy
We have investigated the influence of the symmetry of the side chain substituents in high-mobility, solution processable n-type molecular semiconductors on the performance of organic field-effect transistors (OFETs). We compare two molecules with the same conjugated core, but either symmetric or asymmetric side chain substituents, and investigate the transport properties and thin film growth mode using scanning Kelvin probe microscopy (SKPM) and atomic force microscopy (AFM). We find that asymmetric side chains can induce a favorable two-dimensional growth mode with a bilayer structure, which enables ultrathin films with a single bilayer to exhibit excellent transport properties, while the symmetric molecules adopt an unfavorable three-dimensional growth mode in which transport in the first monolayer at the interface is severely hindered by high-resistance grain boundaries
1936-0851
6778-6787
Hu, Yuanyuan
9dceccc5-8896-45aa-90e4-3669b848223f
Berdunov, Nikolai
5291f8e3-9602-48b4-972c-9c89fab46e17
Di, Chong-an
5e706456-4a4c-40ea-8ec2-4bef593b37fb
Nandhakumar, Iris
e9850fe5-1152-4df8-8a26-ed44b5564b04
Zhang, Fengjiao
1163b2ee-b6bf-4644-b0bd-7b8940fe0fb2
Gao, Xike
fd5ee58e-b919-40db-8504-fa0a90a392da
Zhu, Daoben
a442f51a-7426-487d-b3d8-de0e281ac462
Sirringhaus, Henning
98021341-1aa7-471e-a1e1-41674ffa27ac
Hu, Yuanyuan
9dceccc5-8896-45aa-90e4-3669b848223f
Berdunov, Nikolai
5291f8e3-9602-48b4-972c-9c89fab46e17
Di, Chong-an
5e706456-4a4c-40ea-8ec2-4bef593b37fb
Nandhakumar, Iris
e9850fe5-1152-4df8-8a26-ed44b5564b04
Zhang, Fengjiao
1163b2ee-b6bf-4644-b0bd-7b8940fe0fb2
Gao, Xike
fd5ee58e-b919-40db-8504-fa0a90a392da
Zhu, Daoben
a442f51a-7426-487d-b3d8-de0e281ac462
Sirringhaus, Henning
98021341-1aa7-471e-a1e1-41674ffa27ac

Hu, Yuanyuan, Berdunov, Nikolai, Di, Chong-an, Nandhakumar, Iris, Zhang, Fengjiao, Gao, Xike, Zhu, Daoben and Sirringhaus, Henning (2014) Effect of molecular asymmetry on the charge transport physics of high mobility n-type molecular semiconductors investigated by scanning Kelvin probe microscopy. ACS Nano, 8 (7), 6778-6787. (doi:10.1021/nn500944f).

Record type: Article

Abstract

We have investigated the influence of the symmetry of the side chain substituents in high-mobility, solution processable n-type molecular semiconductors on the performance of organic field-effect transistors (OFETs). We compare two molecules with the same conjugated core, but either symmetric or asymmetric side chain substituents, and investigate the transport properties and thin film growth mode using scanning Kelvin probe microscopy (SKPM) and atomic force microscopy (AFM). We find that asymmetric side chains can induce a favorable two-dimensional growth mode with a bilayer structure, which enables ultrathin films with a single bilayer to exhibit excellent transport properties, while the symmetric molecules adopt an unfavorable three-dimensional growth mode in which transport in the first monolayer at the interface is severely hindered by high-resistance grain boundaries

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Manuscript-to ACS Nano Revision 2-Clean copy.docx - Author's Original
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More information

Accepted/In Press date: 18 June 2014
e-pub ahead of print date: 18 June 2014
Published date: 18 June 2014
Organisations: Chemistry, Faculty of Natural and Environmental Sciences, Electrochemistry

Identifiers

Local EPrints ID: 375110
URI: http://eprints.soton.ac.uk/id/eprint/375110
ISSN: 1936-0851
PURE UUID: 3528995d-487f-40cf-ae58-5275026debda
ORCID for Iris Nandhakumar: ORCID iD orcid.org/0000-0002-9668-9126

Catalogue record

Date deposited: 12 Mar 2015 11:25
Last modified: 28 Feb 2020 01:26

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