PERFORMANCE OPTIMIZATION OF OFETS BY INTERFACE FUNCTIONALIZATION WITH SELF-ASSEMBLED MONOLAYERS

Luiza Batista Capuzzo; Paulo Miranda; Marcos da Silva Sousa

Todos os Trabalhos

Trabalho

Título do Trabalho

PERFORMANCE OPTIMIZATION OF OFETS BY INTERFACE FUNCTIONALIZATION WITH SELF-ASSEMBLED MONOLAYERS

Autores

Luiza Batista Capuzzo
Paulo Miranda
Marcos da Silva Sousa

Modalidade

Pôster - resumo

Área temática

Dispositivos eletrônicos, eletroquímicos, supercapacitores e baterias

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1462581-performance-optimization-of-ofets-by-interface-functionalization-with-self-assembled-monolayers

ISBN

978-65-272-2467-9

Palavras-Chave

organic transistors; self-assembled monolayers; interface engineering; sum-frequency vibrational spectroscopy

Resumo

Organic Field Effect Transistors (OFETs) are the basis of organic electronics, just as inorganic transistors are fundamental building blocks to current (inorganic-based) electronics. Among their main advantages are low cost, simple fabrication, and versatility, made possible by the chemical design of the organic semiconductor properties. An OFET is a three-terminal device (drain, source, and gate), with the gate isolated from the semiconductor film by a dielectric. The dielectric-semiconductor interface is critical, as its chemistry influences the semiconductor structure, and thus the mobility of charge carriers. The dielectric and/or electrodes are usually functionalized with self-assembled monolayers (SAMs) of surfactants to improve device performance [1]. Previous studies by Miranda et al. [2] showed that, under certain conditions, alkyl chains of SAMs can interact with long-chain molecules inducing mutual conformational order, due to strong van der Waals interchain interactions. Thus, in this work we have investigated whether the interaction between SAM chains and semiconducting polymer sidechains influences poly(3-alkylthiophene)-based devices with chains containing 6, 10, and 16 carbons (P3HT, P3DT, and P3HDT). Electrical measurements indicated that the presence of a loosely packed dioctadecyl dimethylammonium bromide (DOAB) monolayer resulted in a significant improvement in device performance, with a much more pronounced effect for polymers with longer side chains (approximately 100 times greater mobility for P3HDT compared to P3HT). To further understand the phenomenon, the molecular conformation of the monolayers will be characterized in situ by nonlinear vibrational spectroscopy (SFG) [3]. Thus, we have demonstrated for the first time the use of SAM-polymer side chains interaction to control the performance of OFETs through modifications at the semiconductor-dielectric interface. Acknowledgements: FAPESP (2025/07848-2), CNPQ (311763/2025-1), INEO (FAPESP 2025/27044-5 and CNPq 408449/2024-1). References: [1] S. Casalini and C. Bortolotti, Chemical Society Reviews v. 46, p. 40–71 (2017) [2] P. Miranda and V. Pflumio, Journal of the American Chemical Society v. 120, p. 12092–12099 (1998) [3] A. Lambert and P. Davies, Applied Spectroscopy Reviews v. 40, p. 103–145 (2005)

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

CAPUZZO, Luiza Batista; MIRANDA, Paulo; SOUSA, Marcos da Silva. PERFORMANCE OPTIMIZATION OF OFETS BY INTERFACE FUNCTIONALIZATION WITH SELF-ASSEMBLED MONOLAYERS.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1462581-PERFORMANCE-OPTIMIZATION-OF-OFETS-BY-INTERFACE-FUNCTIONALIZATION-WITH-SELF-ASSEMBLED-MONOLAYERS. Acesso em: 10/08/2026