Structural and optoelectronic properties of Al-doped zinc oxide films deposited on flexible substrates by radio frequency magnetron sputtering

“…We hypothesize that it is possible to fabricate a variety of functionalized and flexibly tuned three-dimensional mixed ligand MOF thin films by using a range of organic ligand and pillaring ligand combinations. In this work, the HDS template layer is prepared via aluminum-doped ZnO (AZO), which has been extensively exploited for potential applications in the field of optoelectronics. , Although undoped ZnO films may also be used as precursor substrates, this work utilized AZO because the presence of an underlying layer with a large free carrier concentration provides the potential for other applications such as chemiresistive or plasmonic-based sensors. , …”

Section: Introductionmentioning

confidence: 90%

“…In this work, the HDS template layer is prepared via aluminum-doped ZnO (AZO), 46 which has been extensively exploited for potential applications in the field of optoelectronics. 47,48 Although undoped ZnO films may also be used as precursor substrates, this work utilized AZO because the presence of an underlying layer with a large free carrier concentration provides the potential for other applications such as chemiresistive or plasmonic-based sensors. 49,50 ■ RESULTS AND DISCUSSION Effect of bdc Ligands on the MOF Film Growth.…”

Section: ■ Introductionmentioning

confidence: 99%

Centimeter-Scale Pillared-Layer Metal–Organic Framework Thin Films Mediated by Hydroxy Double Salt Intermediates for CO₂ Sensor Applications

Kim

Ellis

Howard

et al. 2020

ACS Appl. Mater. Interfaces

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Fabrication of metal–organic framework (MOF) thin films over macroscopic surface areas is a subject of great interest for gas sensor application platforms such as optics and microelectronics. However, a direct synthesis of MOF films at ambient conditions, in particular pillared-layer MOF films due to their anisotropic structures, remains a significant challenge. Herein, we demonstrate for the first time a facile construction of dense and continuous pillared-layer MOF thin films on a centimeter scale via an aluminum-doped zinc oxide template and hydroxy double salt (HDS) intermediates at room temperature. A series of Cu(II)-based pillared MOFs with different 1,4-benzenedicarboxylic acid (bdc) ligands were explored for optimizing MOF film formation for CO2 sensor applications. Nonpolar ligands with lower water solubility preferentially formed crystalline pillared MOF structures from HDS intermediates. A Cu2(ndc)2(dabco) (ndc = 1,4-naphthalene-bdc; dabco = 1,4-diazabicyclo[2.2.2]octane) MOF demonstrated the most dense and uniform film growth with micrometer thickness over one square centimeter area. This synthetic approach for growing Cu2(ndc)2(dabco) MOF thin films was successfully translated toward two sensing platforms: a quartz crystal microbalance and an optical fiber sensor. These Cu2(ndc)2(dabco) MOF-coated sensors displayed sensitivity toward CO2 and response/recovery time on the scale of seconds, even at moderate humidity levels. This work provides a road map for producing continuous and anisotropic crystalline MOF thin films over a centimeter scale area on various substrates, which will greatly facilitate their utilization in MOF-based sensor devices, among other applications.

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“…low temperatures during film preparation allows the implementation of a large variety of substrates and opens the possibility of using ZnO based materials as transparent electrodes in flexible electronics. 10,11 In this work, we present the comparison among ZnO, Al:ZnO, and Ga:ZnO thin films prepared on Si (100) and silica substrates under identical deposition conditions, correlating the conductivity and changes in the optical properties with the microstructure variations induced by doping. For a better comparison, both doped films have been prepared with the same ratio [dopant]/ [Zn].…”

Section: Introductionmentioning

confidence: 99%

Differences in n-type doping efficiency between Al- and Ga-ZnO films

Gabás

Landa-Cánovas

Costa‐Krämer

et al. 2013

Journal of Applied Physics

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A careful and wide comparison between Al and Ga as substitutional dopants in the ZnO wurtzite structure is presented. Both cations behave as n-type dopants and their inclusion improves the optical and electrical properties of the ZnO matrix, making it more transparent in the visible range and rising up its electrical conductivity. However, the same dopant/Zn ratio leads to a very different doping efficiency when comparing Al and Ga, being the Ga cation a more effective dopant of the ZnO film. The measured differences between Al-and Ga-doped films are explained with the hypothesis that different quantities of these dopant cations are able to enter substitutionally in the ZnO matrix. Ga cations seem to behave as perfect substitutional dopants, while Al cation might occupy either substitutional or interstitial sites. Moreover, the subsequent charge balance after doping appear to be related with the formation of different intrinsic defects that depends on the dopant cation. The knowledge of the doped-ZnO films microstructure is a crucial step to optimize the deposition of transparent conducting electrodes for solar cells, displays, and other photoelectronic devices. V

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Structural and optoelectronic properties of Al-doped zinc oxide films deposited on flexible substrates by radio frequency magnetron sputtering

Cited by 28 publications

References 23 publications

Properties of TiO2 films deposited on flexible substrates using direct current magnetron sputtering and using high power impulse magnetron sputtering

Properties of TiO2 films deposited on flexible substrates using direct current magnetron sputtering and using high power impulse magnetron sputtering

Centimeter-Scale Pillared-Layer Metal–Organic Framework Thin Films Mediated by Hydroxy Double Salt Intermediates for CO₂ Sensor Applications

Differences in n-type doping efficiency between Al- and Ga-ZnO films

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Structural and optoelectronic properties of Al-doped zinc oxide films deposited on flexible substrates by radio frequency magnetron sputtering

Cited by 28 publications

References 23 publications

Properties of TiO2 films deposited on flexible substrates using direct current magnetron sputtering and using high power impulse magnetron sputtering

Properties of TiO2 films deposited on flexible substrates using direct current magnetron sputtering and using high power impulse magnetron sputtering

Centimeter-Scale Pillared-Layer Metal–Organic Framework Thin Films Mediated by Hydroxy Double Salt Intermediates for CO2 Sensor Applications

Differences in n-type doping efficiency between Al- and Ga-ZnO films

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Centimeter-Scale Pillared-Layer Metal–Organic Framework Thin Films Mediated by Hydroxy Double Salt Intermediates for CO₂ Sensor Applications