[논문]A Study on the Current-Voltage Characteristics of Self-Assembled Organic Molecules by using STM

Kim Seung-Un; Shin Hoon-Kyu; Kwon Young-Soo

A Study on the Current-Voltage Characteristics of Self-Assembled Organic Molecules by using STM 원문보기

KIEE international transactions on electrophysics and applications, v.5C no.3, 2005년, pp.115 - 118

Kim Seung-Un (Dept. of Electrical Engineering, Dong-A University) , Shin Hoon-Kyu (Dept. of Electrical Engineering, Dong-A University) , Kwon Young-Soo (Dept. of Electrical Engineering, Dong-A University)

Abstract ▼ AI-Helper

Currently, molecular devices are reported utilizing active self-assembled monolayers (SAMs) containing the nitro group as the active component, which has active redox centers [1]. SAMs are ordered molecular structures formed by the adsorption of an active surfactant on a solid surface. The molecules will be spontaneously oriented toward the substrate surface and form an energetically favorable ordered layer. During this process, the surface-active head group of the molecule chemically reacts with and chemisorbs onto the substrate In this paper, the electrical properties of the 4'4- di(ethynylphenyl)-2'-nitro-1-benzenethiolate was confirmed. This material is well known as a conducting molecule having possible application to molecular level negative differential resistance (NDR) device. To deposit the self-assembly monolayers onto the gold electrode, the prefabricated Au(1 l l) substrates were immersed into 0.5[mM/l] self-assembly molecule in THF solution. Then, the electrical properties and surface morphologies of 4' 4-di(ethynylphenyl)-2' -nitro-1-benzenethiolate were measured by using the ultra-high vacuum scanning tunneling microscopy (UHV-STM).

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가설 설정

7shows mechanism of tunneling current and NDR. (a): In the case of zero voltage, being equilibrium, there is no electron transfer, because the energy level of other part is closed and current is zero, (b): HOMO and LUMO of the organic molecule exist over than Fermi level of probe and gold electrode. At the case, if positive bias is applied on the gold electrode, molecular energy state inclines toward the state of gold electrode, (c): Current reaches to peak value (Vpeak) by tunneling in resonant state between probe and molecule.

제안 방법

Self-assembly is a phenomenon in which atom, molecules, or groups of molecules arrange themselves spontaneously into regular patterns and even relatively complex systems without outside intervention^]. In this study, we characterized electrical properties of 4, 4'- di(ethynylpheny 1)-2' -nitro-1 -benzenethiolate and measured negative differential resistance(NDR), peak-to-valley ratio, using UHV STM system. Recently, the multiple peak current-voltage(I-V) characteristics based on negative differential resistance (NDR) devices have been widely used in various applications because they are expected to greatly reduce circuit complexity [5-7] and achieve high speed operation [8, 9] in the integrated circuits.

대상 데이터

The organic molecules used in the experiment were composed in Korea Research Institute of Chemical Technology (KRICT). Self-assembly of these molecules takes possible thioacetyl or methyl sulfide functional group and can form self-assembled organic thin film easily on the gold electrode surface.

이론/모형

To investigate electrical properties of organic molecule, oxidized silicone wafer (Si<100>) was used. And, as a bottom electrode, Au was evaporated by using Ion Beam Sputtering (IBS) techniques.

참고문헌 (13)

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상세보기
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Woon-Kie Paik, Seunghun Eu, Kanghee Lee Seungwhan Chon, and Minsok Kim, 'Electrochemical Reactions in Adsorption of Organosulfur Molecules on Gold and Silver: Potential Dependent Adsorption', Langmuir, vol. 16, no. 26, pp. 10198-10205, 2000

상세보기
A. Ulman, An Introduction Organic Films, Academic Press, Boston, MA, 1991
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상세보기
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A Study on the Current-Voltage Characteristics of Self-Assembled Organic Molecules by using STM 원문보기

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A Study on the Current-Voltage Characteristics of Self-Assembled Organic Molecules by using STM 원문보기

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