Characteristics Improvement of PEDOT:PSS Transparent Conductive Film Prepared by Ink-Jet Printing

Nitta, Atsushi; Kawahara, Kazuya; Miyata, Koichiro

doi:10.4236/ampc.2016.68024

Cited by 8 publications

(6 citation statements)

References 30 publications

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“…In a previous study, by spraying the polar solvent on a PEDOT:PSS thin film after each time a layer was printed, the characteristics of the PEDOT:PSS thin film were improved in terms of resistivity and transmittance [24]. However, there was a limitation in uniformly applying a polar solvent by artificially spraying it.…”

Section: Examination Of the Application Methods Of A Polar Solventmentioning

confidence: 99%

“…For the conditions of UV/O 3 cleaning, the UV radiation distance was 30mm, the output of a low-pressure mercury lamp was 40 W, and the cleaning time was 20 min. Like a previous study, PEDOT:PSS thin films were formed by printing two to four times [24]. To evaporate the additives that remained in the thin film as impurities after it was formed and adversely affected the conductivity, the thin film was annealed for 30 min after each time a layer was printed and for 60 min after the entire printing process was completed, using a constant-temperature drying oven (EOP-300B; As One Co., Ltd.).…”

Section: Production and Evaluation Of A Thin Filmmentioning

confidence: 99%

“…In previous studies, it has been revealed that cleaning of the plastic-film substrate with UV/O 3 , annealing of the film after it was deposited on the substrate and dipping of the film into a polar solvent were useful to improving the characteristics of the thin film [23] [24]. In the present study, the effects of the removal of a polar solvent by annealing each time after a layer was printed, the changes in the surface state of the film due to the aggregates of PEDOT:PSS particles and the differences in the homogenization of the film surface, according to …”

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confidence: 99%

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Examination of Treatment Methods for a PEDOT:PSS Transparent Conductive Film Produced Using an Inkjet Method

Nitta¹,

Imamura²,

Kawahara³

et al. 2017

AMPC

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Flexible devices manufactured using printed electronics have attracted the attention of many researchers. A high-performance transparent conductive film exhibiting high flexibility and elasticity is expected to be developed because of its need for the creation of flexible devices. An indium tin oxide (ITO) thin film, which has generally been used, has weaknesses such as fragility to bending stress and depletion of the resource. This study focused on poly (3, 4-ethylenedioxythiophene)/poly (styrenesulfonate) (PEDOT:PSS), a conductive polymer material, and examined improvement in the resistivity and transmittance of the transparent conductive film produced using an inkjet method. The present study improved the electrical and optical characteristics of the thin film by examining the annealing temperature between printing operations and the application method of a polar solvent. As a result, the resistivity and transmittance of a PEDOT:PSS thin film were 1.49 × 10 −3 Ω•cm and 89.2%, respectively. This film was obtained by annealing at 90˚C for 30 min and applying a polar solvent, using an inkjet printer, between printing operations. The printing was performed three times.

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Section: Examination Of the Application Methods Of A Polar Solventmentioning

confidence: 99%

Section: Production and Evaluation Of A Thin Filmmentioning

confidence: 99%

mentioning

confidence: 99%

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Examination of Treatment Methods for a PEDOT:PSS Transparent Conductive Film Produced Using an Inkjet Method

Nitta¹,

Imamura²,

Kawahara³

et al. 2017

AMPC

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“…If we can solve these issues and produce a practical transparent conductive film, it will become possible to manufacture flexible devices, including wiring and electrodes, using only printing technology. So far, we have found that cleaning the substrate with ultraviolet/ozone (UV/O 3 ) and post-deposition annealing and treatment using polar solvents are effective for PEDOT:PSS thin films [24] [25]. The characteristics of the thin film were also improved by changing the ink solvent from ethanol to dimethyl sulfoxide (DMSO).…”

mentioning

confidence: 99%

The Polar Solvent Application Method for Organic Transparent Conductive Film Produced by an Inkjet Printing Method

Nitta¹,

Chosa²,

Takeda³

2020

AMPC

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In recent years, flexible electronic devices have attracted much attention. Accordingly, flexible transparent conductive films are being researched actively. The commonly used indium tin oxide (ITO) transparent conductive film has limited flexibility. Therefore, we focused on poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate)(PEDOT:PSS) as a substitute material for ITO and are engaged in producing flexible transparent conductive film using inkjet printers. To improve the characteristics of the transparent conductive film produced by inkjet printing, based on prior research, we found that cleaning the film substrate with ultraviolet/ozone (UV/O 3) and post-deposition annealing and treatment using polar solvents are effective for thin films. In this study, we examined the method of applying the polar solvent. As a result, we were able to improve the homogeneity of the thin film surface by applying the polar solvent to each thin film lamination layer. The resulting characteristics obtained for a three-layer printed PEDOT:PSS thin film with polar solvent coating were resistivity of 1.49 × 10 −3 Ω•cm and transmittance of 84.6%. However, we found that the surface condition changed depending on the processing method, affecting the rate of visible light transmittance.

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“…To determine some origin behind the improved Seebeck coefficient, UV-Vis-NIR absorption spectra were obtained for the CX and SX films. [463][464][465] As shown below in In literature a reduction of charge carriers as indicated by an emergence or increased quantity of polarons or neutral thiophene absorption intensity is usually accompanied by improved Seebeck coefficient in PEDOT:PSS based films. 128,[468][469][470][471] As shown in This is most probably due to the films being thicker than the C1 and C2.…”

Section: Proposed Mechanisms For Increased Seebeck Coefficientmentioning

confidence: 94%

Improvement to the thermoelectric properties of PEDOT:PSS

Atoyo¹

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Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low abundance on earth such as tellurium therefore their use and scaled production would be limited. Organic and hybrid thermoelectric materials can meet the gap for niche markets as well as be synthesized on mass, due to utilization of earth abundant elements such as carbon, sulphur, and nitrogen. The thermoelectric generators require several n and p-type materials connected for optimal efficiency. There are many ways to create inorganic thermoelectric n and p-types. However, for the organic thermoelectric materials the efficiency lags because of their lower electrical conductivity and Seebeck coefficient as well as the lack of effective strategies in the development of n-type materials. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successful and researched p-type organic thermoelectric material and thus, the thesis will explore effective strategies for decoupling the apparent trade-offs observed when improving either the electrical conductivity or Seebeck coefficient. The first major contribution to knowledge discussed in this study is the utilization of a reducing agent treatment on PEDOT-ionic liquid composites (reader is advised to refer to chapter 5). Another significant finding was the successful development of a novel route to an n-type single walled carbon nanotube, PEDOT:PSS composite (please refer to chapter 6). The final and most significant contribution to knowledge in this research project was the development of a set of novel single walled carbon nanotube, ionic liquid, PEDOT:PSS composites whereby after a post treatment with a guanidinium iodide in ethylene glycol solution allowed for improvement of the electrical conductivity from 3.4 S cm -1 to 3665 S cm-1 and Seebeck coefficient from 12 μV K-1 to 27 μV K-1 thereby leading to an optimised power factor of 236 μW m-1 K-1 at 140 °C (please refer to chapter 7).

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Characteristics Improvement of PEDOT:PSS Transparent Conductive Film Prepared by Ink-Jet Printing

Cited by 8 publications

References 30 publications

Examination of Treatment Methods for a PEDOT:PSS Transparent Conductive Film Produced Using an Inkjet Method

Examination of Treatment Methods for a PEDOT:PSS Transparent Conductive Film Produced Using an Inkjet Method

The Polar Solvent Application Method for Organic Transparent Conductive Film Produced by an Inkjet Printing Method

Improvement to the thermoelectric properties of PEDOT:PSS

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