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

    Year: 2019

    Journal: Mater. Sci. Semicond. Process, Volume 91, MAR, page 296–305

    Authors: de Lima Citolino, Lucas Vinicius; da Silva, Edilene Assuncao; Olivati, Clarissa de Almeida

    Organizations: Brazilian agency FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2014/13739-7]; Brazilian agency INEO/CNPq (Instituto Nacional de Eletronica Organica/Conselho Nacional de Desenvolvimento Cientifico e Tecnologico); Brazilian agency CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)CAPES

    Keywords: Thin films; Langmuir-Schaefer; Polythiophene; Electrical impedance spectroscopy; Structure-property relations

    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.
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