High Mobility in Nanocrystal-Based Transparent Conducting Oxide Thin Films
- Authors
- Kim, Byung Hyo; Staller, Corey M.; Cho, Shin Hum; Heo, Sungyeon; Garrison, Carrie E.; Kim, Jongwook; Milliron, Delia J.
- Issue Date
- Apr-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- nanocrystals; transparent conducting oxides; composites; in-filling; doping
- Citation
- ACS NANO, v.12, no.4, pp.3200 - 3208
- Journal Title
- ACS NANO
- Volume
- 12
- Number
- 4
- Start Page
- 3200
- End Page
- 3208
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/40271
- DOI
- 10.1021/acsnano.7b06783
- ISSN
- 1936-0851
- Abstract
- Charge carrier mobility in transparent conducting oxide (TCO) films is mainly limited by impurity scattering, grain boundary scattering, and a hopping transport mechanism. We enhanced the mobility in nanocrystal (NC)-based TCO films, exceeding even typical values found in sputtered thin films, by addressing each of these scattering factors. Impurity scattering is diminished by incorporating cerium as a dopant in indium oxide NCs instead of the more typical dopant, tin. Grain boundary scattering is reduced by using large NCs with a size of 21 nm, which nonetheless were sufficiently small to avoid haze due to light scattering. In-filling of the precursor solution followed by annealing results in a NC-based composite film which conducts electrons through metal-like transport at room temperature, readily distinguished by the positive temperature coefficient of resistance. Cerium-doped indium oxide (Ce:In2O3) NC-based composite films achieve a high mobility of 56.0 cm(2)/V.s, and a low resistivity of 1.25 x 10(-3) Omega.cm. The films are transparent to a broad range of visible and near-infrared light from 400 nm to at least 2500 nm wavelength. On the basis of the high conductivity and high transparency of the Ce:In2O3 NC-based composite films, the films are successfully applied as transparent electrodes within an electrochromic device.
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