Parylene C as a versatile dielectric material for organic field-effect transistors

Marszałek, Tomasz; Gazicki-Lipman, M.; Ulański, Jacek

doi:10.3762/bjnano.8.155

Cited by 56 publications

(48 citation statements)

References 68 publications

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“…Before the pumping of the vacuum chamber, the parylene-N dimer~5 g was transferred into the ceramic evaporator boat. During the thermal decomposition process, the dimer was sublimated by thermal radiation from the perforated Mo foil heated by a high electric current of 100 A and was pyrolyzed into a monomer [38,39] through the small holes of the foil. The monomer vapor formed a polymer on the surface of the CsI:Na film.…”

Section: Methodsmentioning

confidence: 99%

Luminescence of CsI and CsI:Na Films under LED and X-ray Excitation

Hsu

2019

Coatings

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In this study, we investigated the luminous properties of undoped cesium iodide (CsI) and Na-doped CsI (CsI:Na) films deposited by thermal vacuum evaporation and treated with different substrate temperatures, post-annealing temperatures, and deposition rates. The quality of the deposited films was evaluated by their XRD pattern, SEM cross-section/surface morphologies and UV/X-ray luminescence, the spectra of which were used to derive the luminescence mechanism of the deposited films. The 310 nm luminescence demonstrates that the exciting light arises from the electron–hole recombination through the self-trapped exciton (STE) process, which is characteristic of the host polycrystalline CsI. The broad-band luminescence from ~400 to 450 nm demonstrates the other electron–hole recombination between the new energy states created by doping Na in the forbidden gap of CsI. When we deposited higher quality films at a substrate temperature of 200 °C, the undoped CsI films showed preferred crystal orientation at (200), and the CsI:Na films co-evaporated by 1 wt.% NaI at (310) and had the highest UV/X-ray luminescence.

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Section: Methodsmentioning

confidence: 99%

Luminescence of CsI and CsI:Na Films under LED and X-ray Excitation

Hsu

2019

Coatings

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“…Another common organic material used to fabricate flexible substrates and biocompatible encapsulation is parylene-C [106][107][108]. Such highly versatile material features a high purity that reduces the charge trapping phenomena, hence it allows the fabrication of highly stable structures [109]. An example is reported in Figure 5c, where a 16 platinum electrodes (one of which working as reference electrode) array was fabricated onto 12-µm thick flexible parylene-C substrate [110].…”

Section: Flexible Microelectrodesmentioning

confidence: 99%

Flexible and Organic Neural Interfaces: A Review

Lago

Cester

2017

Applied Sciences

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory.Abstract: Neural interfaces are a fundamental tool to interact with neurons and to study neural networks by transducing cellular signals into electronics signals and vice versa. State-of-the-art technologies allow both in vivo and in vitro recording of neural activity. However, they are mainly made of stiff inorganic materials that can limit the long-term stability of the implant due to infection and/or glial scars formation. In the last decade, organic electronics is digging its way in the field of bioelectronics and researchers started to develop neural interfaces based on organic semiconductors, creating more flexible and conformable neural interfaces that can be intrinsically biocompatible. In this manuscript, we are going to review the latest achievements in flexible and organic neural interfaces for the recording of neuronal activity.

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“…Unfortunately these approaches can not be used when parylene C (PPXC) is chosen as gate dielectric as the only proven process for producing high-quality PPXC layers is chemical vapor deposition (CVD). Parylene C has emerged as a particularly interesting material for organic electronic devices as a gate dielectric, coating insulator film, or flexible substrate [3–5] due to its numerous advantageous properties. PPXC films are biocompatible and environmentally friendly [6–9].…”

Section: Introductionmentioning

confidence: 99%

“…It is inferred that parylene C presents a broad applicability and a versatile role in the technology of OFETs and organic compounds [3]. However, parylene C, as the vast majority of polymers, exhibits a low dielectric constant (3.15 at 1 kHz [34]) thus limiting its performance in specific applications in OFETs and electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite–parylene C thin films with high dielectric constant and low losses for future organic electronic devices

Mokni¹,

Maggioni²,

Carturan³

et al. 2019

Beilstein J. Nanotechnol.

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Nanocomposite–parylene C (NCPC) thin films were deposited with a new technique based on the combination of chemical vapor deposition (CVD) for parylene C deposition and RF-magnetron sputtering for silver deposition. This method yields good dispersion of Ag-containing nanoparticles inside the parylene C polymer matrix. Film composition and structure were studied by using several techniques. It was found that the plasma generated by the RF-magnetron reactor modifies the film density as well as the degree of crystallinity and the size of parylene C crystallites. Moreover, silver is incorporated in the parylene matrix as an oxide phase. The average size of the Ag oxide nanoparticles is lower than 20 nm and influences the roughness of the NCPC films. Samples with various contents and sizes of silver-oxide nanoparticles were investigated by broadband dielectric spectroscopy (BDS) in view of their final application. It was found that both the content and the size of the nanoparticles influence the value of the dielectric constant and the frequency-dependence of the permittivity. In particular, β-relaxation is affected by the addition of nanoparticles as well as the dissipation factor, which is even improved. A dielectric constant of 5 ± 1 with a dissipation factor of less than 0.045 in the range from 0.1 Hz to 1 MHz is obtained for a 2.7 µm thick NCPC with 3.8% Ag content. This study provides guidance for future NCPC materials for insulating gates in organic field-effect transistors (OFETs) and advanced electronic applications.

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Parylene C as a versatile dielectric material for organic field-effect transistors

Cited by 56 publications

References 68 publications

Luminescence of CsI and CsI:Na Films under LED and X-ray Excitation

Luminescence of CsI and CsI:Na Films under LED and X-ray Excitation

Flexible and Organic Neural Interfaces: A Review

Nanocomposite–parylene C thin films with high dielectric constant and low losses for future organic electronic devices

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