• Title/Summary/Keyword: Self-Assembled Monolayer

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Recent Trends in the Development of Organic Thin Film Transistor Including SAM Dielectric (SAM 절연체를 이용한 유기박막트랜지스터 개발의 최근 동향)

  • Kim, Sungsoo
    • Journal of Integrative Natural Science
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    • v.2 no.1
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    • pp.13-17
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    • 2009
  • A newly developed OTFT manufacturing process using the combination of self-assembly techniques and vapor phase polymerization method revealed that a thick $SiO_2$ dielectric layer (100~200 nm) is not well compatible with conducting polymer electrode, thereby resulting in still recognizable contact resistance, unstable $V_{th}$ and leaking off current. A couple of very recent studies showed that this issue may be solved by replacing such inorganic dielectric with a self-assembled monolayer or multilayer (organic) dielectric. Therefore, this short review introduces recent trends in the development of high performance thin film transistor consisting of both organic semiconductor and SAM dielectric.

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Pd Seed Layer for Electroless Cu Deposition on TaN Diffusion Barrier by Self-Assembled-Monolayer Method(SAM) (Self assembled-monolayer(SAM)법을 이용한 TaN 확산방지막의 무전해 Cu 도금용 Pd seed layer 제조 및 특성)

  • Han, Won-Kyu;Cho, Jin-Ki;Choi, Jae-Woong;Kim, Jeong-Tae;Yeom, Seung-Jin;Kwak, Noh-Jung;Kim, Jin-Woong;Kang, Sung-Goon
    • Korean Journal of Materials Research
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    • v.17 no.9
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    • pp.469-474
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    • 2007
  • Electroless deposition(ELD) was applied to fabricate Cu interconnections on a TaN diffusion barrier with Pd seed layer. The Pd seed layer was obtained by self-assembled monolayer method(SAM) with PDDA and PSS as surfactants. We were able to obtain about 10nm Pd nano particles as seeds for electroless Cu deposition and the density of Pd seeds was much higher than that of Pd seeds fabricated by conventional Pd sensitization-activation method. Also we were able to obtain finer Cu interconnections by ELD. Therefore we concluded that the Pd seed layer by SAM was able to be applied to form Cu interconnection by ELD for under 30nm feature.

Improved charge balance in quantum dot light-emitting diodes using self-assembled monolayer (자기조립단분자막을 이용한 양자점 발광다이오드의 전하 균형도 개선)

  • Sangwook Park;Woon Ho Jung;Yeyun Bae;Jaehoon Lim;Jeongkyun Roh
    • Journal of IKEEE
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    • v.27 no.1
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    • pp.30-37
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    • 2023
  • To improve the efficiency and stability of colloidal quantum dot light-emitting diodes (QD-LEDs), it is essential to achieve charge balance within the QD emissive layer. Zinc oxide (ZnO) is widely used for constructing an electron transport layer in the state-of-the-art QD-LEDs, but spontaneous electron injection from ZnO often results in excessive electrons in QDs that significantly deteriorate the performance of QD-LEDs. In this study, we demonstrated the improved performance of QD-LEDs by modifying the electron injection property of ZnO with self-assembled monolayer (SAM)-treatment. As a result of improved charge balance, the external quantum efficiency and maximum luminance of QD-LEDs with SAM-treatment were improved by 25% and 200%, respectively, compared to the devices without SAM-treatment.

Surface Damage Characteristics of Self-Assembled Monolayer and Its Application in Metal Nano-Structure Fabrication (자기 조립 분자막의 표면파손특성 및 미세 금속 구조물 제작에의 응용)

  • Sung, In-Ha;Kim, Dae-Eun
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.05a
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    • pp.40-44
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    • 2002
  • The motivation of this work is to use SAM(Self-Assembled Monolayer) for developing a rapid and flexible non-photolithographic nano-structure fabrication technique which can be utilized in micro-machining of metals as well as silicon-based materials. The fabrication technique implemented in this work consists of a two-step process, namely, mechanical scribing followed by chemical etching. From the experimental results, it was found that thiol on copper surface could be removed even under a few nN normal load. The nano-tribological characteristics of thiol-SAM on various metals were largely dependent on the native oxide layer of metals. Based on these findings, nano-patterns with sub-micrometer width and depth on metal surfaces such as Cu, Au and Ag could be obtained using a diamond-coated tip.

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Synthesis of Thiol-Functionalized Ionic Liquids and Formation of Self-Assembled Monolayer on Gold Surfaces: Effects of Alkyl Group and Anion on the Surface Wettability

  • Lee, Bang-Sook;Lee, Sang-Gi
    • Bulletin of the Korean Chemical Society
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    • v.25 no.10
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    • pp.1531-1537
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    • 2004
  • Twenty four thiol-functionalized ionic liquids based on imidazolium cation, 1-(12-mercaptododecyl)-3-alkylimidazolium salts, have been synthesized, and utilized to investigate the effects of alkyl-chain length and anion on the wettability of Au surfaces on the basis of self-assembled monolayers presenting [(CnSAMIM)X], where n = 1-6, X = Br, $BF_4$, $PF_4$ and $NTf_2$. Water wettabilities of the surfaces were measured as a water contact angle by contact angle goniometry. It was found that water wettability of the Au surfaces coated with imidazolium ions was largely dependent not only on counter anions but also on the length of alkyl chains. In the case of SAMs of N-alkylimidazolium ions having short length of N-alkyl chain (C1-$C_4$), anions played great role in determining water wettability of the surfaces.

Electrochemistry on Alternate Structures of Gold Nanoparticles and Ferrocene-Tethered Polyamidoamine Dendrimers

  • Suk, Jung-Don;Lee, Joo-Han;Kwak, Ju-Hyoun
    • Bulletin of the Korean Chemical Society
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    • v.25 no.11
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    • pp.1681-1686
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    • 2004
  • Self-assembled systems with polyamidoamine (PAMAM) dendrimers combined with gold nanoparticles have been widely studied because of their potential applications in molecular electronics, catalyst carriers, chemical sensors, and biomedical devices. In our work, gold nanoparticle monolayers and multilayers with pure and ferrocene-tethered PAMAM dendrimers as cross-linking molecules were deposited on a mixed self-assembled monolayer of gold substrates. The various generations of PAMAM dendrimers can be covalently attached to mercaptoundecanoic acid mixed with a mercaptoundecanol self-assembled monolayer. Cyclic voltammograms show that redox peak currents on the alternate multilayers of gold nanoparticles and ferrocene-tethered PAMAM dendrimers increase as the number of layers increases. Fourier transform IR external reflection spectroscopy and scanning electron microscopy support the results from electrochemical measurements.

STM Study of Self Assembled Monolayer Formed from Binary Mixtures of Substituted Alkyl Chains (치환된 알킬 사슬 혼합물의 자기조립 단분자막 구조지 STM 연구)

  • Son S.B.;Lee H.;Jeon I.C.;Hahn J.R.
    • Journal of the Korean Vacuum Society
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    • v.15 no.2
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    • pp.145-151
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    • 2006
  • The molecular assembly of p-iodo-phenyl octadecyl ether (I-POE), p-iodo-phenyl docosyl ether (I-PDE) and a binary mixture of these two molecules on graphite has been studied using a scanning tunneling microscope. Each molecular system self-assembles on the graphite surface to form a stable monolayer with a head-to-tail configuration. For the binary system, the I-POE and I-PDE molecules do not mix on the surface, preferring instead to form isolated monolayer domains. Here, the I-POE molecules are preferentially adsorbed on the graphite surface, due to the effects of alkyl chain length and the functional group on the monolayer structure.

Electrochemical Properties of Viologen Self-Assembly Monolayer Using QCM (수정진동자를 이용한 Viologen Self-Assembly 단분자막의 전기화학적 특성)

  • 옥진영;신훈규;박재철;장정수;권영수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.6
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    • pp.496-500
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    • 2003
  • Molecular self-assembled of surfactant viologen are of recent interest because they can from functional electrodes as well as micellar assemblies, which can be profitably utilized for display devices, photoelectrochemical studies and electrocatalysis as electron acceptor or electron mediator. Fromherz et al studied the self-assembly of thiol and disulfide derivatives of viologens bearing long n-alkyl chains on Au electrode surface[1]. The electrochemical behavior of self-assembled viologen monolayer has been investigated with QCM, which has been known as nano-gram order mass detector. The self-assembly process of viologen was monitored using resonant frequency(ΔF) and resonant resistance(R). The redox process of viologen was observed with resonant frequency(ΔF).