• Title/Summary/Keyword: Organic pentacene

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ELECTRICAL CHARACTERISTICS OF ORGANIC THIN FILM TRANSISTORS USING FLEXIBLE SUBSTRATE (Flexible한 기판을 사용한 유기 박막 트랜지스터의 전기적 특성 연구)

  • Lee, Jong-Hyuk;Kang, Chang-Heon;Hong, Sung-Jin;Kwak, Yun-Hee;Choi, Jong-Sun
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1590-1592
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    • 2002
  • In this work the electrical characteristics of organic TFTs using organic insulator and flexible polyester substrate have been investigated. Pentacene and PVP(polyvinylphenol) are used as an active semiconducting layer and dielectric layer respectively. Pentacene was thermally evaporated in vacuum at a pressure of about $1{\times}10^{-6}$ Torr and at a deposition rate of $0.5{\AA}$/sec, and PVP was spin-coated. Aluminium and gold were used for gate and source/drain electrodes. 0.1mm thick flexible polyester substrate was used instead of glass or silicon wafer.

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Fabrication of Sub-$10{\mu}m$ Screen Printed Organic Thin-Film Transistors on Paper

  • Jo, Jeong-Dai;Yu, Jong-Su;Yun, Seong-Man;Kim, Dong-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.896-898
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    • 2009
  • The printed electrodes of organic thin-film transistors (OTFTs) were fabricated by screen printing using nanoparticle silver pastes. The screen printed OTFT corresponds to channel lengths between 7.6 to 82.6 ${\mu}m$ (designed L=10 to 80 ${\mu}m$) on the $150{\times}150mm^2$ paper. The channel length deviations for 40 to 80 ${\mu}m$ patterns were less than 5 %. However, the channel lengths for 10 to 30 ${\mu}m$ patterns were increased by 20 %. The screen printed bis(triisopropyl-silylethynyl) pentacene (TIPS-pentacene) OTFTs obtained had a field-effect mobility as large as 0.08 (${\pm}0.02$) $cm^2$/Vs, an on/off current ratio of $10^5$ and a subthreshold slope of 1.95 V/decade.

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Effects of multi-stacked hybrid encapsulation layers on the electrical characteristics of flexible organic field effect transistors

  • Seol, Yeong-Guk;Heo, Uk;Park, Ji-Su;Lee, Nae-Eung
    • Proceedings of the Korean Vacuum Society Conference
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    • 2010.02a
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    • pp.257-257
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    • 2010
  • One of the critical issues for applications of flexible organic thin film transistors (OTFTs) for flexible electronic systems is the electrical stabilities of the OTFT devices, including variation of the current on/off ratio ($I_{on}/I_{off}$), leakage current, threshold voltage, and hysteresis, under repetitive mechanical deformation. In particular, repetitive mechanical deformation accelerates the degradation of device performance at the ambient environment. In this work, electrical stabilities of the pentacene organic thin film transistors (OTFTs) employing multi-stack hybrid encapsulation layers were investigated under mechanical cyclic bending. Flexible bottom-gated pentacene-based OTFTs fabricated on flexible polyimide substrate with poly-4-vinyl phenol (PVP) dielectric as a gate dielectric were encapsulated by the plasma-deposited organic layer and atomic layer deposited inorganic layer. For cyclic bending experiment of flexible OTFTs, the devices were cyclically bent up to $10^5$ times with 5mm bending radius. In the most of the devices after $10^5$ times of bending cycles, the off-current of the OTFT with no encapsulation layers was quickly increased due to increases in the conductivity of the pentacene caused by doping effects from $O_2$ and $H_2O$ in the atmosphere, which leads to decrease in the $I_{on}/I_{off}$ and increase in the hysteresis. With encapsulation layers, however, the electrical stabilities of the OTFTs were improved significantly. In particular, the OTFTs with multi-stack hybrid encapsulation layer showed the best electrical stabilities up to the bending cycles of $10^5$ times compared to the devices with single organic encapsulation layer. Changes in electrical properties of cyclically bent OTFTs with encapsulation layers will be discussed in detail.

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A Study on the Electrical Characteristics of Pentacene Thin Film by Using Surface Treatment (계면처리에 의한 pentacene 박막의 전기적 특성 연구)

  • Lee, Jae-Hyuk;Lee, Yong-Soo;Choi, Jong-Sun;Kim, Eu-Gene
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.1748-1750
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    • 2000
  • There are currently considerable interests in the applications of conjugated polymers, oligomers. and small molecules for thin-film electronic devices. Organic materials have potential advantages to be utilized as semiconductors in field-effect transistors and light-emitting diodes. In this study we fabricated the devices based on pentacene as active layer. Octadecyltrichlorosilane (OTS) is used as buffer layer between $SiO_2$ and pentacene. Atomic force microscopy (AFM), X-ray diffraction (XRD), and electrical conductivity were used with OTS on $SiO_2$ 10nm which the pentacene layer was thermally evaporated in vacuum at a pressure of about $2.0\times10^{-6}$ Torr. In the result of AFM, the grain length is grown by using OTS for surface treatment. Electrical conductivity is changed from $3.19{\times}10^{-6}$ S/cm to $2.12{\times}10^{-7}$ S/cm. We observed that electrical conductivity is also increased by surface treatment. According to these results, the surface treated devices exhibited the increase to compared no treatment.

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A Study on the Electrical Characteristics of Organic Thin Film Transistor using Photoacryl as Gate Dielectric Layer (Photoacryl을 게이트 절연층으로 사용한 유기 박막트랜지스터의 전기적 특성에 관한 연구)

  • 김윤명;표상우;김준호;신재훈;김영관;김정수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.2
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    • pp.110-118
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    • 2002
  • Organic thin film transitors(OTFT) are of interest for use in broad area electronic applications. And recently organic electroluminescent devices(OELD) have been intensively investigated for using in full-color flat-panel display. We have fabricated inverted-staggered structure OTFTs at lower temperature using the fused-ring polycyclic aromatic hydrocarbon pentacene as the active eletronic material and photoacryl as the organic gate insulator. The field effect mobility is 0.039∼0.17 ㎠/Vs, on-off current ratio is 10$\^$6/, and threshold voltage is -7V. And here we report the study of driving emitting, Ir(ppy)$_3$, phosphorescent OELD with all organic thin film transistor and investigated its electrical characteristics. The OELD with a structure of ITO/TPD/8% Ir(ooy)$_3$ doped in BCP/BCP/Alq$_3$/Li:Al/Al and OTFT with a structure of inverted-stagged Al(gate electrode)/photoacry(gate insulator)/pentacene(p-type organic semiconductor)/ Au(source-drain electrode) were fabricated on the ITP patterned glass substrate. The electrical characteristics are turn-on voltage of -10V, and maximum luminance of about 90 cd/㎡. Device characteristics were quite different with that of only OELD.

Pentacene based organic thin film transistor on aqueous media for biosensor

  • Lee, Dong-Jun;Chae, Seung-Geun;Gwon, O-Jun;Jeong, Byeong-Jun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2015.08a
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    • pp.210.2-210.2
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    • 2015
  • 유기 박막 트랜지스터(Organic Thin Film Transistor, OTFT)기반의 바이오센서는 저비용 제작 및 플렉서블 소자 제작이 가능하여 많은 주목을 받아오고 있다. 본 연구에서는, hexamethyldisilazane (HMDS) 표면 처리된 $Si/SiO_2$ 기판 위에 진공 증착 공정을 이용하여 pentacene 기반의 OTFT를 제작한 후, 수용성 매체에 대한 안정성을 향상시키기 위하여 저분자 물질인 tetratetracontane (TTC)를 진공 증착 공정을 이용하여 증착하였으며, cyclized perfluoropolymer (CYTOP)을 용액 공정으로 코팅하여 bilayer의 passivation 층을 형성하였다. 실제 제작된 OTFT의 수용성 매체에 대한 안정성을 테스트하기 위하여 소자에 수용성 phosphate buffered saline (PBS)용액을 투하하여 10분에 걸쳐 1분 간격으로 transistor의 transfer 특성을 측정하였다. 또한 측정된 $I_d-V_g$ 곡선 데이터를 이용하여 시간에 따른 드레인 전류, 이동도, 문턱 전압, 점멸비 등의 수치를 산출하였다. 그리고, 그 $I_d-V_g$ 곡선 데이터와 산출된 데이터들을 증류수가 투하된 OTFT 소자의 $I_d-V_g$ 곡선 데이터와 산출된 데이터들과 비교하였다. 결론적으로, TTC/Cytop bilayer passivation 층이 형성된 OTFT 소자는 인체 내 혈액의 pH와 유사한 PBS 용액 하에서도 안정적인 구동 성능을 보여 바이오센서로 응용될 수 있는 가능성이 있다는 결론을 얻었다.

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Study on the structure and morphology of vacuum-evaporated pentacene as a function of the evaporation condition

  • Chang, Jae-Won;Kim, Hoon;Kim, Jai-Kyeong;Lee, Yun-Hi;Oh, Myung-Hwan;Jang, Jin;Ju, Byeong-Kwon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.754-758
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    • 2002
  • In order to reach the high quality of organic thin films such as high mobility for device applications, it is strongly desirable to study the growth properties of pentacene film as a function of evaporation condition. Here, we report the structure and morphology of thermal evaporated pentacene thin film by AFM, SEM, and XRD as a function of the evaporation rate and substrate temperature. These results play a key role in determining the electric performance of organic thin film transistor devices.

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Threshold Voltage Control of Pentacene Thin-Film Transistor with Dual-Gate Structure

  • Koo, Jae-Bon;Ku, Chan-Hoe;Lim, Sang-Chul;Lee, Jung-Hun;Kim, Seong-Hyun;Lim, Jung-Wook;Yun, Sun-Jin;Yang, Yong-Suk;Suh, Kyung-Soo
    • Journal of Information Display
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    • v.7 no.3
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    • pp.27-30
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    • 2006
  • This paper presents a comprehensive study on threshold voltage $(V_{th})$ control of organic thin-film transistors (OTFTs) with dual-gate structure. The fabrication of dual-gate pentacene OTFTs using plasma-enhanced atomic layer deposited (PEALD) 150 nm thick $Al_{2}O_{3}$ as a bottom gate dielectric and 300 nm thick parylene or PEALD 200 nm thick $Al_{2}O_{3}$ as both a top gate dielectric and a passivation layer was investigated. The $V_{th}$ of OTFT with 300 nm thick parylene as a top gate dielectric was changed from 4.7 V to 1.3 V and that with PEALD 200 nm thick $Al_{2}O_{3}$ as a top gate dielectric was changed from 1.95 V to -9.8 V when the voltage bias of top gate electrode was changed from -10 V to 10 V. The change of $V_{th}$ of OTFT with dual-gate structure was successfully investigated by an analysis of electrostatic potential.