Low-Temperature Processed Ga-Doped ZnO Coatings from Colloidal Inks
AuthorsDella Gaspera, Enrico
KAUST Grant NumberKUS-C1-015-21
MetadataShow full item record
AbstractWe present a new colloidal synthesis of gallium-doped zinc oxide nanocrystals that are transparent in the visible and absorb in the near-infrared. Thermal decomposition of zinc stearate and gallium nitrate after hot injection of the precursors in a mixture of organic amines leads to nanocrystals with tunable properties according to gallium amount. Substitutional Ga3+ ions trigger a plasmonic resonance in the infrared region resulting from an increase in the free electrons concentration. These nanocrystals can be deposited by spin coating, drop casting, and spray coating resulting in homogeneous and high-quality thin films. The optical transmission of the Ga-ZnO nanoparticle assemblies in the visible is greater than 90%, and at the same time, the near-infrared absorption of the nanocrystals is maintained in the films as well. Several strategies to improve the films electrical and optical properties have been presented, such as UV treatments to remove the organic compounds responsible for the observed interparticle resistance and reducing atmosphere treatments on both colloidal solutions and thin films to increase the free carriers concentration, enhancing electrical conductivity and infrared absorption. The electrical resistance of the nanoparticle assemblies is about 30 kΩ/sq for the as-deposited, UV-exposed films, and it drops down to 300 Ω/sq after annealing in forming gas at 450 °C, comparable with state of the art tin-doped indium oxide coatings deposited from nanocrystal inks. © 2013 American Chemical Society.
CitationDella Gaspera E, Bersani M, Cittadini M, Guglielmi M, Pagani D, et al. (2013) Low-Temperature Processed Ga-Doped ZnO Coatings from Colloidal Inks. Journal of the American Chemical Society 135: 3439–3448. Available: http://dx.doi.org/10.1021/ja307960z.
SponsorsThis work was done in the framework of collaborative research activities of Technical Committee 16 (on Nanostructured Glasses), of the International Commission on Glass (ICG). S.M., R.N., and A.S. kindly acknowledge support from the Global Climate energy Project at Stanford University. Partial support by the Center for Advanced Molecular Photovoltaics (award no. KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST), is acknowledged as well. Diane Wu is acknowledged for TEM microscopy.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Tunable infrared absorption and visible transparency of colloidal aluminum-doped zinc oxide nanocrystals.
- Authors: Buonsanti R, Llordes A, Aloni S, Helms BA, Milliron DJ
- Issue date: 2011 Nov 9
- Highly transparent and conductive Al-doped ZnO nanoparticulate thin films using direct write processing.
- Authors: Vunnam S, Ankireddy K, Kellar J, Cross W
- Issue date: 2014 May 16
- Tunable surface plasmon resonance and enhanced electrical conductivity of In doped ZnO colloidal nanocrystals.
- Authors: Ghosh S, Saha M, De SK
- Issue date: 2014 Jun 21
- Comparative studies of Al-doped ZnO and Ga-doped ZnO transparent conducting oxide thin films.
- Authors: Jun MC, Park SU, Koh JH
- Issue date: 2012 Nov 22
- Carrier concentration dependent optical and electrical properties of Ga doped ZnO hexagonal nanocrystals.
- Authors: Saha M, Ghosh S, Ashok VD, De SK
- Issue date: 2015 Jun 28