Electrical, optical and structural characterization of interfaces containing poly(3-alkylthiophenes) (P3ATs) and polydiphenylamine on ITO/TiO2: Interaction between P3ATs polymeric segments and TiO2: Scientific paper

Mayara Masae  Kubota; Ricardo Vignoto Fernandes; Henrique de Santana

doi:10.2298/JSC231125024K

PDF (3.18 MB) Supplementary Material (2.51 MB)

Published: Nov 9, 2024

Updated: 09.11.2024

DOI: https://doi.org/10.2298/JSC231125024K

Keywords:

film incorporated interaction Raman EIS organic photovoltaic cells

Mayara M Kubota

Universidade Estadual de Londrina, Londrina, Brazil

https://orcid.org/0000-0003-1562-4046

Ricardo V. Fernandes

Universidade Estadual de Londrina, Londrina, Brazil

Henrique de Santana

State University of Londrina, Londrina, Brasil

https://orcid.org/0000-0003-3145-9079

Abstract

With the aim of studying the use of conjugated polymers poly(3-methylthiophene) (P3MT), poly(3-hexylthiophene) (P3HT) and polydiphenylamine (PDPA) in order to produce the active layer of inverted organic solar cells forming the interface with TiO₂ and also to help shed light on the optical and electronic properties applied to develop this technology, the interfaces between films containing P3MT, P3HT and PDPA on the indium tin oxide (ITO) electrode were electrochemically prepared, after chemically depositing a film of TiO₂. The systems under investigation were designated ITO/TiO₂/P3MT, ITO/TiO₂/PDPA/P3MT, ITO/TiO₂/PDPA, ITO/TiO₂/P3HT and ITO/TiO₂/PDPA/P3HT and characterized by Raman techniques (spectroscopy and microscopy), electrochemical impedance spectroscopy (EIS) and photoluminescence (PL). In this study, the aromatic, semiquinone and quinone segments in the polymer matrices of P3ATs and PDPA at these interfaces were monitored and characterized by comparison with films of their homopolymers by means of Raman spectroscopy and EIS. The Raman imaging demonstrates that the P3MT film can be incorporated into the titanium oxide crystalline lattice. The systems containing P3MT or P3HT were found to strongly interact with the TiO₂, stabilizing the P3AT radical cation segments and the presence of PDPA destabilized this interaction. These findings were complemented by the low-temperature (15 K) PL spectra, revealing a reduction in the intensity and displacement of the band associated with the radical cation emission, observed in the absence of TiO₂ in the system under investigation.

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[1]

M. M. Kubota, R. V. Fernandes, and H. de Santana, “Electrical, optical and structural characterization of interfaces containing poly(3-alkylthiophenes) (P3ATs) and polydiphenylamine on ITO/TiO2: Interaction between P3ATs polymeric segments and TiO2: Scientific paper”, J. Serb. Chem. Soc., vol. 89, no. 10, pp. 1323–1336, Nov. 2024.

Issue

Vol. 89 No. 10 (2024)

Section

Electrochemistry

This work is licensed under a Creative Commons Attribution 4.0 International License.

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution license 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.

Funding data

Conselho Nacional de Desenvolvimento Científico e Tecnológico
Grant numbers 302732/2020-9

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Electrical, optical and structural characterization of interfaces containing poly(3-alkylthiophenes) (P3ATs) and polydiphenylamine on ITO/TiO2: Interaction between P3ATs polymeric segments and TiO2 Scientific paper