• 열처리공학회지
• /
• 제29권2호
• /
• pp.62-65
• /
• 2016

TIO thin films were deposited on the poly-carbonate substrates with RF magnetron sputtering under different sputtering power condition to investigate the influence of deposition rate on the electrical and optical properties of the films. Although, all films have the similar carrier concentration, the films prepared at a lower deposition rate of 4 nm/min show a higher mobility of $5.96cm^2\;V^{-1}S^{-1}$ due to the low surface roughness. In addition, optical transmittance is also influenced by a deposition rate. Based on the figure of merit, it can be concluded that the lower deposition rate effectively enhances the opto-electrical performance of IGZO films for use as transparent conducting oxides in flexible display applications.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2005년도 춘계학술대회논문집
• /
• pp.424-429
• /
• 2005

In this paper, the response characteristics of one to one resonance on the rectangular cantilever beam in which basic harmonic excitations are applied by nonlinear coupled differential integral equations are studied. This equations have 3-dimensional non-linearity of nonlinear inertia and nonlinear curvature. Galerkin and multi scale methods are used for theoretical approach to one to one internal resonance. Nonlinear response characteristics of 1st, 2nd, 3rd modes are measured from the experiment for basic harmonic excitation. From the experimental result, geometrical terms of nonlinearity display light spring effect and these terms play an important role in the response characteristics of low frequency modes. Dynamic behaviors in the out of plane are also studied.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.1266-1267
• /
• 2011

We studied the influence of cathode material on the stability of organic phtovoltaics (OPVs). OPVs with LiF/Al and Ag/Ca/Ag cathode were fabricated and the stability were evaluated. The sample with LiF/Al cathode showed efficiency degradation from 2.42% to 2.04% during 50 days. On the other hand, the sample with Ag/Ca/Ag cathode showed more steeper efficiency degradation from 2.38% to 0.80% during 50 days. The different of degradation can be attributed to a larger increase of series resistance ($R_s$) in Ag/Ca/Ag cathode sample.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.25-26
• /
• 2011

In this paper, we investigated the effect of various annealing processes on the electrical characteristics of oxide thin film transistors (TFTs). When we annealed the TFT devices before and after source/drain (S/D) process, we could observe the different electrical characteristics of oxide TFTs. When we annealed the TFTs after deposition of transparent indium zinc oxide S/D electrodes, the annealing process decreased the contact resistance but increased the resistivity of S/D electrodes. The field effect mobility, subthreshold slope and threshold voltage of the oxide TFTs annealed before and after S/D process were 5.83 and 4.47 $cm^2$/Vs, 1.20 and 0.82 V/dec, and 3.92 and 8.33 V respectively. To analyze the differences, we measured the contact resistances and the carrier concentrations using transfer length method (TLM) and Hall measurement.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.1499-1500
• /
• 2011

In this paper, we investigated the electrical properties change of 6,13-bis(triisopropyl-silylethynyl) pentacene (TIPS-pentacene) depending on polymer blend. We fabricated organic thin film transistor (OTFT) using blending solution of small molecule and polymer. In this study poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH-PPV), poly (9-vinylcarbazole) (PVK), poly [N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine] (poly-TPD), poly(${\alpha}$-methyl styrene), Poly(methyl methacrylate) (PMMA) are used as a polymer. Fabricated OTFT with blending solution of TIPS-pentacene and PVK shows best performance in this experiment. OTFT fabricated by blending solution of TIPS-pentacene and PVK shows field effect mobility of 0.0189 $cm^2/V{\cdot}s$, on/off ratio of 1.9E-5 and threshold voltage of 7.4 V.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.1445-1446
• /
• 2011

ITO 박막의 전기 광학적 특성을 향상시키기 위해 열처리 공정은 필수적이다. 하지만 향후 발전시켜나갈 플렉서블 디스플레이(flexible display)에서는 ITO를 저온에서 증착해야 할 필요성이 대두되었고, 이에 따라 기판의 온도를 상온으로 유지하면서 고품질의 ITO 박막을 제조하고자 하는 연구가 진행되고 있다. 본 연구에서는 상온에서 유리 기판 위에 RF 마그네트론 스퍼터링(magnetron sputtering) 장치의 자기장 분포를 제어하여 ITO 박막을 증착하였다. 제작된 시편의 두께와 투과도 및 이동도를 측정 비교하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.1477-1478
• /
• 2011

Solution processed zinc tin oxide (ZTO) thin films were studied using a spin coating for the fabrication of thin film transistors and simple circuits. The solution processed thin film transistors (W/L = 100/10 ${\mu}m$) have the average saturation mobility of 1.9 $cm^2$/Vs, threshold voltage of 20 V, and subthreshold slope of 0.5 V/decade. The dc characteristics of an inverter with $W_{load}=100\;{\mu}m$ and $W_{drive}=10\;{\mu}m$, measured under votage supply of $V_{DD}$ = +50 V. The inverter beta ratio is 20 ($R=(W_{drived}/L_{drive})/(W_{load}/L_{load})=20$) and $gain_{max}$ is 2. The characteristics of an oscillator were measured under voltage supply of $V_{DD}$ = +60 V.

• 한국전기전자재료학회논문지
• /
• 제23권11호
• /
• pp.891-895
• /
• 2010

Polymer dispersed liquid crystal (PDLC) films were prepared by the phase separation method using the liquid crystal (E7) and prepolymers. This work investigated the electro-optical characteristics of various PDLC films. In order to have good contrast ratio, the polymer refractive index must be adjusted to the ordinary refractive index of the liquid crystal. The driving voltage of PDLC films were mainly affected by elastic deformation. E7-Ebecryl810-IOA-TMPTA-HMPPO system had good threshold voltage and driving voltage and E7-Ebecryl810-EHA-PEGDA-HMPPO system had good contrast ratio.

• 전자통신동향분석
• /
• 제21권5호통권101호
• /
• pp.129-140
• /
• 2006

정보화의 심화 및 대중화에 따라서 다양한 정보를 시각화하여 인간에게 전달하는 디스플레이로서 장소, 시간에 구애됨이 없으면서 초경량, 저전력의 얇고, 종이처럼 가볍고 유연한 플렉시블 디스플레이가 최근 학문적, 산업적으로 많은 주목을 받고 있다. 플렉시블 디스플레이를 구현하기 위해서는 플렉시블 기판(박형 유리, 메탈호일, 플라스틱), 저온 공정용 유기, 무기 소재, 플렉시블 일렉트로닉스, 봉지 그리고 패키징 기술 등이 복합적으로 필요하다. 이중에서 플렉시블 기판은 플렉시블 디스플레이의 성능, 신뢰성, 가격을 결정하는 가장 중요한 부품으로 인식되고 있다. 플렉시블 기판 중에서는 플라스틱 기판이 가공의 용이성, 저 중량(유리의 1/2), 연속 공정의 적합성 등으로 인해서 광범위하게 적용이 검토되고 있다. 본 고에서는 디스플레이용 플라스틱 기판의 최근 산업적, 기술적 동향에 관해서 설명한다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.2013-2014
• /
• 2011

Indium tin oxide (ITO) thin films have been deposited onto bare glass substrates by sol-gel process. The solution was prepared by mixing indium precursor and tin precursor dissolved in 2-methoxyethanol at $75^{\circ}C$ for 12 hours. Indium tin oxide films were prepared by slowly heat up to $200^{\circ}C$ for 10 minutes and annealed at $350^{\circ}C$ for 1 hour. In this paper, we researched simple and inexpensive sol-gel process. To find the optimal ratio of In/Sn to reduce electric resistance in ITO made by sol-gel process, we assessed electric properties varying the ratio of In and Sn precursor.