One-reactor vacuum and plasma synthesis of transparent conducting oxide nanotubes and nanotrees: from single wire conductivity to ultra-broadband perfect absorbers in the NIR
Open Access
- 5 July 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 13 (32), 13882-13895
- https://doi.org/10.1039/d1nr01937f
Abstract
The eventual exploitation of one-dimensional nanomaterials yet needs the development of scalable, high yield, homogeneous and environmentally friendly methods able to meet the requirements for the fabrication of under design functional nanomaterials. In this article, we demonstrate a vacuum and plasma one-reactor approach for the synthesis of the fundamental common element in solar energy and optoelectronics, i.e. the transparent conducting electrode but in the form of nanotubes and nanotrees architectures. Although the process is generic and can be used for a variety of TCOs and wide-bandgap semiconductors, we focus herein on Indium Doped Tin oxide (ITO) as the most extended in the previous applications. This protocol combines widely applied deposition techniques such as thermal evaporation for the formation of organic nanowires serving as 1D and 3D soft templates, deposition of polycrystalline layers by magnetron sputtering, and removal of the template by simply annealing under mild vacuum conditions. The process variables are tuned to control the stoichiometry, morphology, and alignment of the ITO nanotubes and nanotrees. Four-probe characterization reveals the improved lateral connectivity of the ITO nanotrees and applied on individual nanotubes shows resistivities as low as 3.5 ± 0.9 x 10-4 Ω·cm, a value comparable to single-crystalline counterparts. The assessment of diffuse reflectance and transmittance in the UV-VIS range confirms the viability of the supported ITO nanotubes as a random optical media working as strong scattering layers. Further ability to form ITO nanotrees opens the path for practical applications as ultra-broadband absorbers in the NIR. The demonstrated low resistivity and optical properties of these ITO nanostructures open the way for their use in LEDs, IR shield, energy harvesting, nanosensors, and photoelectrochemical applicationsFunding Information
- Ministerio de Ciencia e Innovación (PID2019-110430GB-C21, PID2019-109603RA-I0)
- Consejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía (US-1263142, AT17-6079, P18-RT-3480)
- Australian Research Council
- Universidad de Sevilla (VI PPIT-US)
- H2020 European Research Council (715832, 851929)
This publication has 71 references indexed in Scilit:
- Pursuing Near-Zero ResponseScience, 2013
- Past achievements and future challenges in the development of optically transparent electrodesNature Photonics, 2012
- UV light emitting transparent conducting tin-doped indium oxide (ITO) nanowiresNanotechnology, 2011
- Emerging Transparent Electrodes Based on Thin Films of Carbon Nanotubes, Graphene, and Metallic NanostructuresAdvanced Materials, 2011
- Air- and Light-Stable Superhydrophobic Colored Surfaces Based on Supported Organic NanowiresLangmuir, 2009
- Three-dimensional electrodes for dye-sensitized solar cells: synthesis of indium–tin-oxide nanowire arrays and ITO/TiO2core–shell nanowire arrays by electrophoretic depositionNanotechnology, 2009
- Synthesis of Supported Single-Crystalline Organic Nanowires by Physical Vapor DepositionChemistry of Materials, 2008
- Radial Electron Collection in Dye-Sensitized Solar CellsNano Letters, 2008
- Synthesis and ethanol sensing properties of indium-doped tin oxide nanowiresApplied Physics Letters, 2006
- Synthesis of tin-doped indium oxide nanowires by self-catalytic VLS growthJournal of Physics D: Applied Physics, 2004