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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Supramolecular architecture and electrical conductivity in organic semiconducting thin films

Full text
Author(s):
Fernandes, Jose Diego [1] ; Maximino, Mateus D. [1] ; Braunger, Maria Luisa [2] ; Pereira, Matheus S. [1] ; Olivati, Clarissa de Almeida [1] ; Constantino, Carlos J. L. [1] ; Alessio, Priscila [1]
Total Authors: 7
Affiliation:
[1] Sao Paulo State Univ, Sch Technol & Appl Sci, UNESP, BR-19060900 Presidente Prudente, SP - Brazil
[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Dept Appl Phys, UNICAMP, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 22, n. 24, p. 13554-13562, JUN 28 2020.
Web of Science Citations: 3
Abstract

Organic thin films are an essential component of the structure of optical and electronic devices. However, the optical and electrical properties of these films depend on their supramolecular architecture, which may vary according to the techniques used to manufacture them. Here, the correlation between conductivity and supramolecular architecture was investigated. The supramolecular architecture was analyzed in terms of the molecular organization and J- or H-aggregation established during the fabrication of perylene tetracarboxylic diimide (PTCD) nanometric films. Three deposition techniques, Langmuir-Schaefer (LS), Langmuir-Blodgett (LB), and Physical Vapor Deposition (PVD), were evaluated. The UV-vis absorption spectra indicated that LS, LB, and PVD films grow homogeneously. Also, the presence of J and H aggregates was observed for all films, the H aggregates prevailing for the LB film. The FTIR measurements suggested that the molecular organization is similar for LS and LB films, with a tendency to form head-on organization onto a solid substrate. For the PVD film, the perylene macrocycles are inclined approximately 45 degrees relative to the substrate. AFM measurements indicated a homogenous surface for all films. In terms of electrical conductivity, the highest conductivity was found for LS, followed by LB and PVD. The conductivity values were interpreted in terms of molecular organization and J- or H-aggregate formation. (AU)

FAPESP's process: 17/06534-8 - Impact of Emerging Pollutants in Health: a Study on Biomimetic Membranes
Grantee:Priscila Alessio Constantino
Support Opportunities: Regular Research Grants
FAPESP's process: 10/20094-1 - Fabrication and electrical characterization of solar cells from organic thin films
Grantee:Maria Luisa Braunger Fier
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 14/50869-6 - INCT 2014: on Organic Electronics
Grantee:Roberto Mendonça Faria
Support Opportunities: Research Projects - Thematic Grants