Passivation of organic field effect transistor with photopatterned Parylene to improve environmental stability

Nair, Shiny; Kathiresan, M.; Mukundan, T.; Natarajan, V.

doi:10.1016/j.mee.2016.06.001

Cited by 22 publications

(22 citation statements)

References 27 publications

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“…20 EG pnJs can be utilized to circumvent most of the technical difficulties resulting from the use of metallic contacts and multiple device interconnections. Research in developing materials for gating and preserving properties of large devices has seen limited success with amorphous boron nitride, [21][22] atomicallylayered high-k dielectrics, [23][24][25][26] Parylene, [27][28][29] and hexagonal boron nitride, [30][31] whereas other materials have been more successful, such as (poly)-methyl methacrylate ((P)MMA), ZEP520A photoresist, tetrafluoro-tetracyanoquinodimethane (F4TCNQ), and chromium tricarbonyl. 16,[32][33] For millimeter-scale constructions, one major issue was fabricating correspondingly large pnJs.…”

Section: Introductionmentioning

confidence: 99%

Atypical quantized resistances in millimeter-scale epitaxial graphene p-n junctions

Rigosi

Patel

Marzano

et al. 2019

Carbon

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We have demonstrated the millimeter-scale fabrication of monolayer epitaxial graphene p-n junction devices using simple ultraviolet photolithography, thereby significantly reducing device processing time compared to that of electron beam lithography typically used for obtaining sharp junctions. This work presents measurements yielding nonconventional, fractional multiples of the typical quantized Hall resistance at ν = 2 (R H ≈ 12906 Ω) that take the form: a b R H. Here, a and b have been observed to take on values such 1, 2, 3, and 5 to form various coefficients of R H. Additionally, we provide a framework for exploring future device configurations using the LTspice circuit simulator as a guide to understand the abundance of available fractions one may be able to measure. These results support the potential for drastically simplifying device processing time and may be used for many other two-dimensional materials.

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Section: Introductionmentioning

confidence: 99%

Atypical quantized resistances in millimeter-scale epitaxial graphene p-n junctions

Rigosi

Patel

Marzano

et al. 2019

Carbon

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“…Particularly, unprotected organic electronic devices suffer from degradation because they are typically susceptible to the environmental factors present under ambient conditions. Thus, encapsulation is a necessary technique used to maintain the electrical functionality of these devices and to protect them from harsh environments …”

Section: Introductionmentioning

confidence: 99%

Toward Environmentally Robust Organic Electronics: Approaches and Applications

et al. 2017

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Recent interest in flexible electronics has led to a paradigm shift in consumer electronics, and the emergent development of stretchable and wearable electronics is opening a new spectrum of ubiquitous applications for electronics. Organic electronic materials, such as π-conjugated small molecules and polymers, are highly suitable for use in low-cost wearable electronic devices, and their charge-carrier mobilities have now exceeded that of amorphous silicon. However, their commercialization is minimal, mainly because of weaknesses in terms of operational stability, long-term stability under ambient conditions, and chemical stability related to fabrication processes. Recently, however, many attempts have been made to overcome such instabilities of organic electronic materials. Here, an overview is provided of the strategies developed for environmentally robust organic electronics to overcome the detrimental effects of various critical factors such as oxygen, water, chemicals, heat, and light. Additionally, molecular design approaches to π-conjugated small molecules and polymers that are highly stable under ambient and harsh conditions are explored; such materials will circumvent the need for encapsulation and provide a greater degree of freedom using simple solution-based device-fabrication techniques. Applications that are made possible through these strategies are highlighted.

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“…For comparing the results of the conducting polymer electrode based OTFT with conventional OTFT, devices with Pd source and drain electrode were also fabricated and patterned by lift-off process. Parylene C was employed for simultaneous passivation and patterning of Pentacene [30], as previously reported by our group. The schematic of the fabricated OTFT for studies on effect of electrodes is shown in Fig.…”

Section: Thin Film Transistor Fabricationmentioning

confidence: 99%

“…The OTFTs fabricated for realizing the flexible amplifiers in this study were passivated with Parylene C. The process of passivation also simultaneously patterned the semiconductor layer, which reduced the leakage current and increased the I on /I off ratio. The results of effect of passivation have been discussed in detail in [30]. The mobility of the Pentacene OTFT passivated with Parylene C remained constant during the period of study of four months.…”

Section: Otft Characteristicsmentioning

confidence: 99%

Signal amplification with patterned conducting polymer electrodes based organic thin film transistor circuit

2019

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Organic thin film transistors (OTFTs) fabricated with non-destructive patterning techniques are the building blocks in realizing flexible electronic interface for sensing applications. In this study, a single stage differential amplifier is demonstrated with flexible OTFTs. The OTFTs were fabricated with thermally evaporated Pentacene as the semiconducting layer. The electrodes of the OTFTs were realized using a conductive polymer composite, poyaniline:polystyrene sulphonic acid (PANi-PSS), patterned by a modified Parylene lift-off process. Electrical characteristics of bottom contact TFTs with polymeric PANi-PSS electrodes is superior to those with conventional metal electrodes due to a lower charge injection barrier and resultant lower contact resistance. The measurement of the transistor characteristics and the amplifier response reported has been carried out with a wafer probing test jig set up. The differential amplifier realized with p-type Pentacene transistors with mobility, 0.5 cm 2 /Vs, exhibited a voltage gain of 10 dB in a frequency bandwidth of 1 kHz.

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Passivation of organic field effect transistor with photopatterned Parylene to improve environmental stability

Cited by 22 publications

References 27 publications

Atypical quantized resistances in millimeter-scale epitaxial graphene p-n junctions

Atypical quantized resistances in millimeter-scale epitaxial graphene p-n junctions

Toward Environmentally Robust Organic Electronics: Approaches and Applications

Signal amplification with patterned conducting polymer electrodes based organic thin film transistor circuit

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