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  • AIP Publishing  (13)
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  • AIP Publishing  (13)
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  • 1
    Online Resource
    Online Resource
    Controllable conduction and hidden phase transitions revealed via vertical strain
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 25 ( 2019-06-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 25 ( 2019-06-24)
    Abstract: The desire for room-temperature multiferroicity has motivated the search for hidden phase transitions at higher temperatures. By means of the imposition of vertical strain in EuTiO3 (ETO)–MgO nanocomposite films, we unveil two hidden phase transitions in the strained ETO phase at around T′ = 80 K and T* = 230 K, and we are able to tune the behavior of the electrical conductivity at these temperatures. Compared with the phase transition temperatures in bulk ETO, T′ remains unchanged and T* is increased owing to stretching of the c-axis lattice. Interface-limited conduction appears at both transitions, in contrast to the bulk-limited mode shown at other temperatures. With regard to the underlying mechanism, it is found that controllable behavior of conduction at the transition temperatures can be achieved by the common effect of vertical strain and oxygen vacancies. Overall, the present work highlights the importance of the effect of vertical strain in revealing and enhancing the tunability of properties at hidden phase transitions.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5096833
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Photonics-inspired terahertz whispering gallery mode resonator waveguide on silicon platform
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 17 ( 2021-10-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 17 ( 2021-10-25)
    Abstract: Terahertz (THz) photonic waveguides are of great importance in THz integrated technology, especially for versatile signal processing. However, in THz photonics, very few fundamental “building blocks” equivalent to those used in muti-functional electronics circuits exist. This study proposes a photonics-inspired micro-ring whispering gallery mode resonator (WGMR) waveguide with a standard waveguide-compatible package on silicon platform. A gradual taper is integrated on the same chip to improve the coupling efficiency and reduce transmission loss. The packaged WGMR waveguide with an operating range of 0.360 to 0.440 THz had a maximum measured extinction ratio of 32 dB at 0.390 THz, with a Q factor of 385 and an insertion loss of 2.6 dB. The compact and standard waveguide-compatible packaged WGMR can easily be integrated into practical terahertz application systems for THz signal processing and as a tool for the study of fundamental THz science.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0065696
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Prediction of the adhesive behavior of bio-inspired functionally graded materials against rough surfaces
    AIP Publishing ; 2014
    In:  AIP Advances Vol. 4, No. 6 ( 2014-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 4, No. 6 ( 2014-06-01)
    Abstract: Roughness effect and adhesion properties are important characteristics to be accessed in the development of functionally graded materials for biological and biomimetic applications, particularly for the hierarchical composition in biomimetic gecko robot. A multi-asperities adhesion model to predict the adhesive forces is presented in this work. The effect of surface roughness and graded material properties, which significantly alter the adhesive strength between contact bodies, can be simultaneously considered in the generalized model. It is found that proper interfacial strength can be controlled by adjusting surface roughness σ / R, graded exponent k and material parameter E*R / Δγ. The results should be helpful in the design of new biomimetic materials and useful in application of micro functional instruments.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4886380
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    Experimental study of the proposed super-thermal-conductor: BAs
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 7 ( 2015-02-16)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 7 ( 2015-02-16)
    Abstract: Recent calculations predict a super-thermal-conductivity of ∼2000 Wm−1 K−1, comparable to that of diamond, in cubic boron arsenide (BAs) crystals, which may offer inexpensive insulators with super-thermal-conductivity for microelectronic device applications. We have synthesized and characterized single crystals of BAs with a zinc blende cubic structure and lattice parameters of a = 4.7830(7) Å. A relatively high thermal conductivity of ∼200 Wm−1 K−1 is obtained, close to those of best non-carbon crystal insulators, such as SiC, although still an order of magnitude smaller than the value predicted. Based on our XPS, X-ray single crystal diffraction, and Raman scattering results, steps to achieve the predicted super-thermal conductivity in BAs are proposed.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4913441
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
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  • 5
    Online Resource
    Online Resource
    First-principles study towards the reactivity of the Pd(111) surface with low Zn deposition
    AIP Publishing ; 2011
    In:  The Journal of Chemical Physics Vol. 134, No. 18 ( 2011-05-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 134, No. 18 ( 2011-05-14)
    Abstract: Methanol steam reforming (MSR) is an important means to produce hydrogen. While metal Pd shows no selectivity to MSR, PdZn alloy exhibits both high selectivity and activity towards this process. Recently a high temperature desorption peak of formaldehyde is observed when methanol is dosed onto Pd(111) surfaces on which 0.03–0.06 monolayer Zn is deposited. Strikingly such surface which is predominated by Pd atoms was suspected to be active for MSR. To determine the structure on which the high desorption peak is observed and its performance to MSR, we studied adsorption and dehydrogenation of formaldehyde on various models. It is demonstrated that the high desorption peak of CH2O may originate from the supported surface clusters. The calculated energy barriers of CH2O dehydrogenation show that while formaldehyde can decompose easily into formyl on the supported PdZn and Pd2 clusters, this process is kinetically difficult on the surface Zn3 clusters. It is further revealed that formation of dioxymethylene, the proposed precursor for CO2 production, from formaldehyde and oxygen is feasible on the surface Zn cluster. Based on these calculations we predict that compared with 1:1 PdZn alloy, the activity of the Zn clusters to MSR is lower, though its selectivity may be higher.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3587136
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 6
    Online Resource
    Online Resource
    Effect of Zn on the adsorption of CO on Pd(111)
    AIP Publishing ; 2010
    In:  The Journal of Chemical Physics Vol. 133, No. 21 ( 2010-12-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 133, No. 21 ( 2010-12-07)
    Abstract: Introduction of a second metal can greatly modify the surface reactivity of a host metal. Recently Jeroro and Vohs found that Pd(111) deposited with 0.03–0.06 monolayer of Zn might possess unique activity to methanol steam reforming reaction. To investigate the distribution of the deposited Zn, we examined the adsorption of CO on two types of model systems. In the first model, Zn is in the top-layer of Pd(111) only, while in the second model Zn is placed in the subsurface exclusively. It is found that Zn atoms in the topmost layer show negligible effect on CO adsorption especially at hollow sites, whereas the second layer Zn atoms affect significantly the interaction of CO with the substrate. It is revealed that the negligible influence of the first layer Zn on CO adsorption is due to the offsetting of the ligand effect by the strain effect. On the other hand, the ligand effect dominates the CO adsorption in the second model where the strain effect is insignificant. It is demonstrated that the d-band centers correlate well with the binding energies of the second model, whereas no such good correlation exists for the first model. Our results show that the subsurface plays a more important role and the observed dramatic modification of surface reactivity of Pd(111) deposited with 0.03–0.06 ML Zn is most likely originated from the subsurface Zn atoms, if the coverage is not underestimated and the deposited Zn atoms are distributed uniformly within a layer.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3512631
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    The great improvement effect of pores on ZT in Co1−xNixSb3 system
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 93, No. 4 ( 2008-07-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 93, No. 4 ( 2008-07-28)
    Abstract: In this paper, the Co1−xNixSb3+y system (x=0.1,0.2; y=0, 0.05) has been prepared by direct current induced hot press and annealing. Pores were made by annealing pressed Co1−xNixSb3.05 pellets into Co1−xNixSb3 pellets during annealing. It was found that from room temperature to 500°C, the pores with diameter larger than 1μm has significantly increased the Seebeck coefficient, considerably decreased the thermal conductivity, almost maintained the electrical conductivity constant, and therefore markedly improved the dimensionless figure of merit (ZT) of Co1−xNixSb3 system. By comparing the samples, we conclude that inducing pores into skutterudites is an effective route to greatly improve the ZT.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2963476
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    A micro-thin-film getter–heater unit for high vacuum capsulation of MEMS devices
    AIP Publishing ; 2022
    In:  AIP Advances Vol. 12, No. 1 ( 2022-01-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 12, No. 1 ( 2022-01-01)
    Abstract: In this paper, we proposed a micro-getter unit with a square thin-film getter formed atop a thin-film heater for vacuum packaging of a Micro-Electro-Mechanical System (MEMS) device. This innovation through an integrated module unit can be fabricated by MEMS compatible processes and can be sealed together with a MEMS device by wafer level package technology sequentially. It has the advantage of locally and repeatedly activating the getter by supplying a DC power to the micro-thin-film heater. Two models have been studied comparatively in this work, in which a conventional solid structure (SS) model with a micro-heater directly above a silica glass substrate was used as a reference model for comparison with the newly designed innovative floating structure (FS) model with a micro-heater floating over a cavity in a silicon substrate. According to a finite element method simulation based on Fourier’s law of heat conduction, the FS model showed better thermal efficiency than the SS model during the activation process. For a square micron thin-film getter with a size as 1000 × 1000 × 5 µm3, a rather low input voltage as 2 V can raise the temperature of the getter up to 300 °C calculated by the FS Model, while the SS model requires a much higher input voltage as 18 V to reach the same temperature.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/6.0001580
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2583909-3
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  • 9
    Online Resource
    Online Resource
    Self-formed PbI2-DMSO adduct for highly efficient and stable perovskite solar cells
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 23 ( 2019-12-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 23 ( 2019-12-02)
    Abstract: Currently, chemical vapor deposition (CVD) has attracted widespread attention for preparing high efficiency and large-scale perovskite solar cells (PSCs). The surface morphology and crystallinity of precursor lead iodide (PbI2) films play a critical role in the subsequent CVD process. Here, we use a self-formed PbI2-dimethyl sulfoxide adduct in precursor PbI2 for fabricating a high quality perovskite film. The results show that a larger grain size and excessive PbI2 in the perovskite film effectively suppress carrier recombination, which is helpful to improve the device stability and efficiency. It is noted that the device maintained an excellent stability with almost the same efficiency after 1000 h (in a dry N2 glovebox, 25 °C). Finally, the PSC by using the CVD method exhibits a high power conversion efficiency of 17.9% with a bandgap of 1.60 eV, an open voltage (VOC) of 1140 mV, a short-circuit current density (JSC) of 20.1 mA/cm2, and a fill factor of 78%. This method provides guidance for preparing large-area solar cells or applications in tandem solar cells.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5126518
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Erratum: “The great improvement effect of pores on ZT in Co1−xNixSb3 system” [Appl. Phys. Lett. 93, 042108 (2008)]
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 93, No. 8 ( 2008-08-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 93, No. 8 ( 2008-08-25)
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2977996
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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