차세대 투명전극 소재의 종류와 특성 - cheric.org

1 ReviewAppl. Chem. Eng., Vol. 25, No. 3, June 2014, 242-248 (2014 2 19 , 2014 3 17 , 2014 4 16 )Materials and Characteristics of Emerging Transparent ElectrodesMoon Hyun Chung, Seyul Kim, Dohyuk Yoo, and Jung Hyun Kim Department of Chemical & Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea(Received February 19, 2014; Revised March 17, 2014; Accepted April 16, 2014) . , ITO (Indium Tin Oxide) . ITO.

2 ITO .Flexibility of a transparent device has been required in accordance with miniaturization and mobilization needs in recent industry. The most representative material used as a transparent electrode is indium tin oxide (ITO). However, a couple of disadvantages of ITO are the exhaustion of natural resource of indium and its inflexibility due to inorganic substance. To over-come the limit of ITO, a variety of alternative materials have been researched on development of transparent electrodes and its properties through composite materials. In this review, we classify some of emerged materials with their general : Transparent electrode, Transparent conducting oxide, Carbon materials, Conducting polymer, Metal nanowire1.

3 1) , , . , , , PET (polyethylene terephthalate), PES (polyethersulfone) . , , , . (transparent conducting oxide, TCO), (silver nanowire), (carbon nanotube, CNT), ( graphene ), (conducting polymer) , Corresponding Author: Yonsei UniversityDepartment of Chemical & Biomolecular Engineering, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, KoreaTel: +82-2-2123-7633 e-mail: 1225-0112 eISSN: 1228-4505 @ 2014 The Korean Society of Industrial and Engineering Chemistry.

4 All rights reserved. (indium tin oxide, ITO) . , ITO [1]. ITO . , , , , , [2]. ITO .2. Transparent conducting oxide (TCO) TCO (In2O3) (SnO2) 10 wt% ITO [3]. ITO eV n-type 243 Appl. Chem. Eng.

5 , Vol. 25, No. 3, 2014(a) (b)(c) (d)Figure 1. (a) SEM images of Ag NW film. The sheet resistance depends on the different density of the Ag NW[8]. (b) Compare the different concentrations of Ag NWs lead to different transmittance and ITO coated on PET[9], (c) Measured change in sheet resistance of the bending radiusbetween ITO / PET and Ag NW / PET, (d) Measured the change in sheet resistance of the bending cycle[12]. [4] .ITO In Sn 300 C Sn In ITO . , ITO , 2 3% (strain) [5,6] [7].

6 , , . ITO In , ITO ZnO (Zinc Oxide), SnO2 (Tin Dioxide) . TiO2 (Titanium Dioxide), GZO (Ga-doped ZnO), AZO (Al-doped ZnO), - - [5].ZnO , ZnO ITO .SnO2 ITO ITO ZnO , , . , , TCO.

7 Metallic nanowire . , . silver nanowires (Ag NWs) , . Ag NWs (haze) Ag NW 40 100 nm, 1 20 m [5,8]. Ag NWs (15 100 / ) Ag NWs [8,9](Figure 1(a), (b)). 244 , 25 3 , 2014(a)(b)Figure 2. (a) Schematic of graphene transfer process[14], (b) Graphenetransparent electrode film of the 30 inch size which is manufacturedusing a roll-to-roll process[15].

8 Figure 3. The transmittance of the different sheet resistance of SWCNT[19]. , (optoelectronics) [10]. Ag NWs (150 C) , O2 Ag NWs . Ag NW [12](Figure 1(c), (d)). Carbon GrapheneGraphene 2 , CNT (Carbon Nanotube) , graphene . quantum hall effect 200,000 cm2/V s [13] , , ITO.

9 graphene Geim [14] . graphene graphene .2009 Nature graphene (Figure 2(a)). graphene Ni Ni , CVD (Chemical Vapor Deposition) graphene . graphene 280 / , 80% [15]. , 2010 30 inch graphene 125 / , 97% . [16,17](Figure 2(b)). Carbon nanotubesCarbon Nanotubes (CNT).

10 CNT Single Wall Carbon Nanotubes (SWCNT), Double Wall Carbon Nanotubes (DWCNT), Multi Wall Carbon Nanotubes (MWCNT) , [18]. , CNT .CNT CNT CNT . , , , CNT CNT . / CNT , [5]. CNT 200 500 / 245 Appl. Chem. Eng.