Hybrid and pristine polyalkylthiophene Langmuir-Schaefer films: Relationships of electrical impedance spectroscopy measurements, barrier properties and polymer nanostructure

• Autor(a) principal: de Lima Citolino, Lucas Vinicius [UNESP]
• Data de Publicação: 2019
• Outros Autores: Assunção da Silva, Edilene [UNESP], de Almeida Olivati, Clarissa [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• DOI: 10.1016/j.mssp.2018.11.031
• Texto Completo: http://dx.doi.org/10.1016/j.mssp.2018.11.031; http://hdl.handle.net/11449/187141
• topic: Electrical impedance spectroscopy; Langmuir-Schaefer; Polythiophene; Structure-property relations; Thin films

Molecular organization in solid state plays a central role on organic devices performance. In this sense, a thorough investigation of thin films with application in organic electronics is imperative. This work addressed the fabrication and the morphological, optical and electrical characterization of Langmuir-Schaefer (LS) films of poly(3-hexylthiophene) (P3HT), pristine and mixed with stearic acid (SA), and their use as the active layer in organic Schottky diodes. The floating materials isotherms showed the SA molecules acting as a stabilizer for the P3HT in the Langmuir trough. Moreover, deposited P3HT:SA films present significant morphological changes, an improvement of the films overall structural ordering and a more effective charge transport within the active layer through electrical outcome. The alternating current measurements along with theoretical fitting, using equivalent electrical circuits, provided a good alternative to investigate the interfacial effects of the P3HT and P3HT:SA films deposited onto Al and Au electrodes.