ITO Obtained by Spray Pyrolysis and Coating on Glass Substrate

Campos, Beatriz M. de; Freiria, Gabriela S.; Ciuffi, Kátia J.; Faria, Emerson H. de; Rocha, Lucas A.; Nassar, Eduardo J.; Lima, Milton Sérgio Fernandes de

doi:10.21577/0103-5053.20170095

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…This signal is very strong in the case of the aldehyde-bearing films deposited on ITO and almost disappears in the case of bare PEDOT deposited on ITO. The appearance of the indium–oxygen stretching could be attributed to a possible interaction occurring between the oxygen of the carbonyl group and the indium atoms of the inorganic substrate . Concerning the hydrophilicity of the electropolymerized films, the contact angle measurements showed that the aldehyde group is strongly affecting the wettability of the films.…”

Section: Resultsmentioning

confidence: 96%

“…The appearance of the indium− oxygen stretching could be attributed to a possible interaction occurring between the oxygen of the carbonyl group and the indium atoms of the inorganic substrate. 49 Concerning the hydrophilicity of the electropolymerized films, the contact angle measurements showed that the aldehyde group is strongly affecting the wettability of the films. The contact angles of 81.9 and 88.8°measured respectively for a water drop on PEDOT−CHO and on poly(trimer−CHO) prove that the aldehyde-bearing polymers are much more hydrophobic with respect to electropolymerized PEDOT for which the water contact angle is 12.2°(Supporting Information Section 10 and Figures S16−S18).…”

Section: Resultsmentioning

confidence: 99%

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Thiophene-Based Aldehyde Derivatives for Functionalizable and Adhesive Semiconducting Polymers

Istif

Mantione

Vallan

et al. 2020

ACS Appl. Mater. Interfaces

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The pursuit for novelty in the field of (bio)electronics demands for new and better-performing (semi)conductive materials. Since the discovery of poly(3,4-ethylenedioxythiophene) (PEDOT), the ubiquitous golden standard, many studies have focused on its applications but only few on its structural modification and/or functionalization. This lack of structural variety strongly limits the versatility of PEDOT, thus hampering the development of novel PEDOT-based materials. In this paper, we present a short and simple strategy for introducing an aldehyde functionality in thiophene-based semiconducting polymers. First, through a two-step synthesis, an EDOT–aldehyde derivative was prepared and polymerized, both chemically and electrochemically. Next, to overcome the inability of thiophene–aldehyde to be polymerized by any means, we synthesized a trimer in which thiophene–aldehyde is enclosed between two EDOT groups. The successful chemical and electrochemical polymerization of this new trimer is presented. The polymer suspensions were characterized by ultraviolet–visible–near-infrared spectroscopy, while the corresponding films were characterized by Fourier transform infrared and four-point-probe conductivity measurements. Afterward, insoluble semiconducting films were formed by using ethylenediamine as a cross-linker, demonstrating in this way the suitability of the aldehyde group for the easy chemical modification of our material. The efficient reactivity conferred by aldehyde groups was also exploited for grafting fluorescent polyamine nanoparticles on the film surface, creating a fluorescent semiconducting polymer film. The films prepared by electropolymerization, as shown by means of a sonication test, exhibit strong surface adhesion on pristine indium tin oxide (ITO). This property paves the way for the application of these polymers as conductive electrodes for interfacing with living organisms. Thanks to the high reactivity of the aldehyde group, the aldehyde-bearing thiophene-based polymers prepared herein are extremely valuable for numerous applications requiring the facile incorporation of a functional group on thiophene, such as the functionalization with labile molecules (thermo-, photo-, and electro-labile, pH sensitive, etc.).

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Thiophene-Based Aldehyde Derivatives for Functionalizable and Adhesive Semiconducting Polymers

Istif

Mantione

Vallan

et al. 2020

ACS Appl. Mater. Interfaces

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“…Various deposition techniques have been used to obtain TCO thin films, such as: vacuum thermal evaporation [15–16], chemical vapor deposition [17], sol–gel [18], pyrolysis spray techniques [5,19], magnetron sputtering [20–22], and pulsed laser deposition (PLD) [23].…”

Section: Introductionmentioning

confidence: 99%

Rapid thermal annealing for high-quality ITO thin films deposited by radio-frequency magnetron sputtering

Prepelita¹,

Stavarache²,

Crǎciun³

et al. 2019

Beilstein J. Nanotechnol.

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In this work, rapid thermal annealing (RTA) was applied to indium tin oxide (ITO) films in ambient atmosphere, resulting in significant improvements of the quality of the ITO films that are commonly used as conductive transparent electrodes for photovoltaic structures. Starting from a single sintered target (purity 99.95%), ITO thin films of predefined thickness (230 nm, 300 nm and 370 nm) were deposited at room temperature by radio-frequency magnetron sputtering (rfMS). After deposition, the films were subjected to a RTA process at 575 °C (heating rate 20 °C/s), maintained at this temperature for 10 minutes, then cooled down to room temperature at a rate of 20 °C/s. The film structure was modified by changing the deposition thickness or the RTA process. X-ray diffraction investigations revealed a cubic nanocrystalline structure for the as-deposited ITO films. After RTA, polycrystalline compounds with a textured (222) plane were observed. X-ray photon spectroscopy was used to confirm the beneficial effect of the RTA treatment on the ITO chemical composition. Using a Tauc plot, values of the optical band gap ranging from 3.17 to 3.67 eV were estimated. These values depend on the heat treatment and the thickness of the sample. Highly conductive indium tin oxide thin films (ρ = 7.4 × 10−5 Ω cm) were obtained after RTA treatment in an open atmosphere. Such films could be used to manufacture transparent contact electrodes for solar cells.

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