• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.677-678
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• 2007

• 공업화학
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• 제29권2호
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• pp.162-167
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• 2018

투명전도성필름(transparent conductive film, TCF) 제조를 위해 사용되는 은 나노입자의 평균입자 크기 및 형태가 폴리에틸렌 테리프탈레이트(polyethylene terephthalate, PET) 필름 위에 코팅된 은 전도성 라인의 광학 및 전기특성에 미치는 영향을 연구하였다. Ag-CM, Ag-ME 및 Ag-EE 방식으로 제조한 은 나노입자가 Ag-EB, Ag-CR 및 Ag-PL 방식으로 제조한 은 나노입자보다 투명도는 차이가 없으나 전도도에서 우수한 특성을 보였다. 이는 입자의 크기가 앞에 언급한 세 가지 경우 평균 입도가 약 80 nm 이하이고 입도의 균일도가 양호한 반면, 뒤에 언급한 세 가지 경우 평균입도가 100 nm 이상이며 입자의 뭉침 현상이 심하게 나타난 결과와 관련이 있음을 확인하였다. 이 결과는 PET 필름 위에 코팅을 하고 건조시켜 제조한 패턴을 각각의 시료별로 SEM으로 정면과 측면에서 관찰하였을 때, 패턴의 형상 및 두께의 균일도 측면에서 나타난 결과와 동일하였다. 따라서 은 나노입자의 평균입자 크기가 작고 입자의 균일성이 유지될수록 보다 우수한 전기 특성을 나타냄을 확인하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.121.2-121.2
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• 2011

Aluminum-doped Zinc Oxide (AZO) is considered as an excellent candidate to replace Indium Tin Oxide (ITO), which is widely used as transparent conductive oxide (TCO) for electronic devices such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs) and organic solar cells (OSCs). In the present study, AZO thin film was applied to the transparent electrode of a channel-shaped flexible organic solar cell using a low-temperature selective-area atomic layer deposition (ALD) process. AZO thin films were deposited on Poly-Ethylene-Naphthalate (PEN) substrates with Di-Ethyl-Zinc (DEZ) and Tri-Methyl-Aluminum (TMA) as precursors and $H_2O$ as an oxidant for the atomic layer deposition at the deposition temperature of $130^{\circ}C$. The pulse time of TMA, DEZ and $H_2O$, and purge time were 0.1 second and 20 second, respectively. The electrical and optical properties of the AZO films were characterized as a function of film thickness. The 300 nm-thick AZO film grown on a PEN substrate exhibited sheet resistance of $87{\Omega}$/square and optical transmittance of 84.3% at a wavelength between 400 and 800 nm.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.116.1-116.1
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• 2011

Materials with a combination of high electrical conductivity and optical transparency are important components of many electronic and optoelectronic devices such as liquid crystal displays, solar cells, and light emitting diodes. In this study, to fabricate a low-resistance and high optical transparent electrode film for organic photovoltaic, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of thermal roll imprinted (TRI) poly-carbonate (PC) patterned films, the manufacture of high-conductivity and low-resistance Ag paste which was filled into patterned PC film using a doctor blade process and then coated with a thin film layer of conductive polymer by a spin coating process. As a result of these imprinting processes the PC films obtained a line width of $10{\pm}0.5{\mu}m$, a channel length of $500{\pm}2{\mu}m$, and a pattern depth of $7.34{\pm}0.5{\mu}m$. After the Ag paste was used to fill part of the patterned film with conductive polymer coating, the following parameters were obtained: a sheet resistance of $9.65{\Omega}$/sq, optical transparency values were 83.69 % at a wavelength of 550 nm.

• 마이크로전자및패키징학회지
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• 제21권2호
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• pp.1-11
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• 2014

Flexible transparent conductive electrodes (TCEs) have recently attracted a great deal of attention owing to rapid advances in flexible electronic devices, such as flexible displays, flexible photovoltanics, and e-papers. As the performance and reliability of flexible electronics are critically affected by the quality of TCE films, it is imperative to develop TCE films with low resistivity and high transparency as well as high flexibility. Indium tin oxide (ITO) has been the most dominant transparent conducting material due to its high optical transparency and electrical conductivity. However, ITO is susceptible to cracking and delamination when it is bent or deformed. Therefore, various types of flexible TCEs, such as carbon nanotube, conducting polymers, graphene, metal mesh, Ag nanowires (NWs), and metal mesh have been extensively investigated. Among several options to replace ITO film, Ag NWs and metal mesh have been suggested as the promising candidate for flexible TCEs. In this paper, we focused on Ag NWs and metal mesh, and summarized the current development status of Ag NWs and metal mesh. The several critical issues such as high contact resistance and haze are discussed, and newly developed technologies to resolve these issues are also presented. In particular, the flexibility and durability of Ag NWs and metal mesh was compared with ITO electrode.

• 공업화학
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• 제20권6호
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• pp.612-616
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• 2009

Transparent conducting oxide (TCO) 박막은 평판 디스플레이 산업에 널리 사용되고 있다. 화학적으로 우수한 투명전도성 indium zinc oxide (IZO) 필름은 현재 널리 사용되고 있는 indium tin oxide (ITO) 필름의 대체 물질로 관심을 끌고있다. 본 연구에서는 ITO에 비해 낮은 증착 온도에서도 낮은 비저항과 높은 투과율을 가지는 IZO 박막을 전자빔 증착법을 사용하여 polynorbornene (PNB) 기판(Tg = $330^{\circ}C$) 위에 증착하는 조건에 대하여 연구하였다. 90 : 10 wt%의 $In_2O_3$와 ZnO를 혼합하여 만든 타겟으로 전자빔 증착법을 이용하여 PNB 기판 위에 IZO 박막을 제조하여, 기판온도와 산소도입 속도에 따른 IZO 필름의 전기 광학적 특성을 연구하였다. 그 결과 4 sccm의 $O_2$, $150^{\circ}C$의 기판온도, 증착속도 $2{\AA}$/sec 및 $1000{\AA}$ 두께로 증착된 IZO 필름에서 우수한 전기 광학적 성질인 $5.446{\times}10^2{\Omega}/{\boxempty}$ 면저항 및 87.4% 광투과율을 얻을 수 있었다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.2.3-2.3
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• 2011

With increased interest in printed devices, various metal nano inks have been investigated as candidates materials for printed electrodes and wiring as well as conductive film substituting photo-lithography process. Recent advances in organic conductive polymer allow us to fabricate high performance printed device. Meanwhile, there was several attempts to fabricate conductive films by mixing conductive polymer with metal nano-particle or nano-wires. The presence of Ag nanowires in conductive polymer mixture have shown good potential in organic photovoltaic devices.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.547-547
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• 2012

As displays become larger and solar cells become cheaper, there is an increasing need for low-cost transparent electrodes. Intensive effort has been made to replace ITO (Indium Tin Oxide) based transparent electrode with cheap and flexible ones. Among those, silver nanowires have got limelight because of its great conductivity and flexibility. Even though the electric property of the Ag nanowire based transparent electrode surpassed ITO, the optical property needs to be improved (lower transmittance, higher haze). Here, we reported transparent electrode based on Ag nanowires and conducting polymer to improve optical properties. The Ag nanowires are coated onto PET films and the resulting transparent electrode film shows $200ohm/{\Box}$ resistance and > 90% optical transmittance.

• Applied Science and Convergence Technology
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• 제26권6호
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• pp.149-156
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• 2017

Recently, stretchable and transparent electrodes have received great attention owing to their potential for realizing wearable electronics. Unlike the traditional transparent electrodes represented by indium tin oxide (ITO), stretchable and transparent electrodes are able to maintain their electrical and mechanical properties even under stretching stress. Lots of research efforts have been dedicated to the development of stretchable and transparent electrodes since they represent the most important engineering platform for the production of wearable electronics. Various approaches using silver nanowires, nanostructured networks, conductive polymers, and carbon-based electrodes have been explored by many world leading research groups. In this review, present and recent advances in the fabrication methods of stretchable and transparent electrodes are discussed.

• 세라미스트
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• 제21권1호
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• pp.12-23
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• 2018

As the flexible displays have been considered as a breakthrough to make a new electronics category, transparent electrodes have also confronted with an emerging issue, i.e., they also need to be mechanically flexible. For this to be made possible, a transparent electrode capable of withstanding large amounts of strain must be developed. Indium tin oxide (ITO) has been one of the most widely adopted transparent electrodes for displays and other transparent electronics, mainly supported by its high electrical conductivity and optical transparency. However, its brittle nature has forced the display industry to search for other alternatives. Recently, advances in nano-material researches have opened the door for various transparent conductive materials, which include carbon nanotube, graphene, Ag and Cu nanowire, and printable metal grids. Here we reviewed recently-published research works introducing flexible displays, all of which are employing the novel candidates for a conducting material.