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

Author(s)

de Lima Citolino, Lucas Vinicius ^[1] ; da Silva, Edilene Assuncao ^[1] ; Olivati, Clarissa de Almeida ^[1]

Affiliation

^[1] Univ Estadual Paulista, UNESP, Fac Ciencias & Tecnol, CP 467, BR-19060900 Presidente Prudente - Brazil

• Document type: Journal article
• Source: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING; v. 91, p. 296-305, MAR 2019.
• Web of Science Citations: 1

Abstract

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. (AU)

• FAPESP's process: 14/13739-7 - Fabrication and electrical charactherization of organic photovoltaic cells based on thin films
• Grantee: Clarissa de Almeida Olivati
• Support Opportunities: Research Program on Global Climate Change - Regular Grants