Molecular interplay at the PMMA dielectric and C13-BTBT semiconductor interface
A growing interest towards all-organic electronics emphasized the importance of interfaces between the functional components of such devices. In particular, the interaction between the dielectric and semiconductor plays a critical role in device functionality, with strong dependency of charge carrie...
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| Vydáno v: | Physical chemistry chemical physics : PCCP |
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| Hlavní autoři: | , , , , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
18.09.2025
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| ISSN: | 1463-9084, 1463-9084 |
| On-line přístup: | Zjistit podrobnosti o přístupu |
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| Shrnutí: | A growing interest towards all-organic electronics emphasized the importance of interfaces between the functional components of such devices. In particular, the interaction between the dielectric and semiconductor plays a critical role in device functionality, with strong dependency of charge carrier accumulation and mobility on semiconductor molecular arrangement. We report on the beneficial adsorption conformation with a nearly upright standing molecular orientation of a 2-tridecyl-[1]benzothieno[3,2-b][1]benzothiophene (C13-BTBT) semiconductor monolayer deposited on Langmuir-Blodgett-prepared polymethyl methacrylate (PMMA) dielectric films. Such an alignment favors a smooth transfer of charge carriers due to the optimal orbital overlap between π-conjugated BTBT units. Atomistic insights into the C13-BTBT/PMMA system through molecular dynamics revealed an advantageous direct contact of the charge-transporting BTBT unit with PMMA, while the alkyl chain is pointing outwards. Compared to non-alkylated BTBT, we demonstrate a 43% lower stiffness for surface-exposed alkyl chains of a C13-BTBT monolayer, as determined by force-distance analysis, highlighting the advantage for flexible device applications. These insights open new perspectives for further engineering of advanced interfaces, paving the way for innovations in efficient carbon-based electronics.A growing interest towards all-organic electronics emphasized the importance of interfaces between the functional components of such devices. In particular, the interaction between the dielectric and semiconductor plays a critical role in device functionality, with strong dependency of charge carrier accumulation and mobility on semiconductor molecular arrangement. We report on the beneficial adsorption conformation with a nearly upright standing molecular orientation of a 2-tridecyl-[1]benzothieno[3,2-b][1]benzothiophene (C13-BTBT) semiconductor monolayer deposited on Langmuir-Blodgett-prepared polymethyl methacrylate (PMMA) dielectric films. Such an alignment favors a smooth transfer of charge carriers due to the optimal orbital overlap between π-conjugated BTBT units. Atomistic insights into the C13-BTBT/PMMA system through molecular dynamics revealed an advantageous direct contact of the charge-transporting BTBT unit with PMMA, while the alkyl chain is pointing outwards. Compared to non-alkylated BTBT, we demonstrate a 43% lower stiffness for surface-exposed alkyl chains of a C13-BTBT monolayer, as determined by force-distance analysis, highlighting the advantage for flexible device applications. These insights open new perspectives for further engineering of advanced interfaces, paving the way for innovations in efficient carbon-based electronics. |
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| Bibliografie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1463-9084 1463-9084 |
| DOI: | 10.1039/d5cp02629f |