Nanostructured Metal Oxide Thin Films for Humidity Sensors

Steele, J.J.; Taschuk, Michael T.; Brett, Michael

doi:10.1109/jsen.2008.920715

Cited by 111 publications

(73 citation statements)

References 48 publications

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“…This is supported by the fact that there is virtually no effective optical constant variation along c. It is well-known that such nanostructured thin films are very sensitive high-speed capacitive humidity sensors. 21 In general, the depolarization factors render a biaxial material with column-like geometry extended along the c-axis:…”

Section: Fig 2 (Color Online)mentioning

confidence: 99%

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

Schmidt

Schubert

2012

Applied Physics Letters

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Optical properties of passivated metal slanted columnar thin films from cobalt within the visible spectral region are reported. Glancing angle deposition is utilized to grow slanted nanocolumns which have been conformally coated with Al2O3 by a subsequent atomic layer deposition process. A generalized anisotropic Bruggeman effective medium approximation has been employed to analyze spectroscopic generalized ellipsometry data. The modified homogenization approach allows for determination of biaxial (monoclinic) optical and structural properties as well as fractions of three film constituents. The conformal alumina passivation layer preserves the pristine metal character of the nanostructures and prevents oxidation and aging effects.

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Section: Fig 2 (Color Online)mentioning

confidence: 99%

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

Schmidt

Schubert

2012

Applied Physics Letters

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“…54 Although the hygroscopic PEDOT:PSS is known to be catastrophic for organic solar cells, [44][45][46] we should keep in mind that semiconductor oxides like ZnO and MoO 3 can also be sensitive to moisture. [47][48][49][50][51] In fact, semiconductor oxides are used as humidity sensors 50,51 and thus the ambient atmosphere also exerts an important effect on the IMEC devices. In general, most of the features observed for the NREL devices were observed for the IMEC devices.…”

Section: Un-encapsulated Devices: Nrel and Imecmentioning

confidence: 99%

On the stability of a variety of organic photovoltaic devices by IPCE and in situ IPCE analyses – the ISOS-3 inter-laboratory collaboration

Terán-Escobar

Tanenbaum

Voroshazi

et al. 2012

Phys. Chem. Chem. Phys.

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This work is part of the inter-laboratory collaboration to study the stability of seven distinct sets of state-of-the-art organic photovoltaic (OPV) devices prepared by leading research laboratories. All devices have been shipped to and degraded at RISØ-DTU up to 1830 hours in accordance with established ISOS-3 protocols under defined illumination conditions. In this work, we apply the Incident Photon-to-Electron Conversion Efficiency (IPCE) and the in situ IPCE techniques to determine the relation between solar cell performance and solar cell stability. Different ageing conditions were considered: accelerated full sun simulation, low level indoor fluorescent lighting and dark storage. The devices were also monitored under conditions of ambient and inert (N 2 ) atmospheres, which allows for the identification of the solar cell materials more susceptible to degradation by ambient air (oxygen and moisture). The different OPVs configurations permitted the study of the intrinsic stability of the devices depending on: two different ITO-replacement alternatives, two different hole extraction layers (PEDOT:PSS and MoO 3 ), and two different P3HT-based polymers. The response of un-encapsulated devices to ambient atmosphere offered insight into the importance of moisture in solar cell performance. Our results demonstrate that the IPCE and the in situ IPCE techniques are valuable analytical methods to understand device degradation and solar cell lifetime.

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“…Hence, it's monitoring, detection and control under different working conditions is also important. The need for monitoring, measuring and controlling the relative humidity (RH) precisely has led to the development of variety of humidity sensors [1][2][3][4][5][6][7]. There is need to develop humidity sensors having applications based on specific needs and desired range.…”

Section: Introductionmentioning

confidence: 99%

Application of V<sub>2</sub>O<sub>5</sub>-ZnO Nanocomposite for Humidity Sensing Studies

Pandey¹

2017

IJMSA

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Abstract:Paper reports humidity sensing studies of V 2 O 5 -ZnO nanomaterial. When sample of V 2 O 5 -ZnO annealed at 500°C was exposed to increasing humidity, resistance decreased. Aging over six months was within ±6% for ZnO and ±2% for V 2 O 5 -ZnO; hysteresis was within ±6% for both ZnO and V 2 O 5 -ZnO sensing elements. Grain size for pure ZnO was 620 nm, and 400 nm for V 2 O 5 -ZnO nanomaterial. XRD suggested a distribution of crystallite size. For ZnO-V 2 O 5 , distribution in the crystallites size was as wide as 130% compared to only 20% for ZnO. Sensitivity of ZnO-V 2 O 5 nanomaterial was 500% more compared to ZnO sample.

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Nanostructured Metal Oxide Thin Films for Humidity Sensors

Cited by 111 publications

References 48 publications

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

On the stability of a variety of organic photovoltaic devices by IPCE and in situ IPCE analyses – the ISOS-3 inter-laboratory collaboration

Application of V<sub>2</sub>O<sub>5</sub>-ZnO Nanocomposite for Humidity Sensing Studies

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Nanostructured Metal Oxide Thin Films for Humidity Sensors

Cited by 111 publications

References 48 publications

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition

On the stability of a variety of organic photovoltaic devices by IPCE and in situ IPCE analyses – the ISOS-3 inter-laboratory collaboration

Application of V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;-ZnO Nanocomposite for Humidity Sensing Studies

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Application of V<sub>2</sub>O<sub>5</sub>-ZnO Nanocomposite for Humidity Sensing Studies