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Publisher: Springer-Verlag   (Total: 2329 journals)

 Applied Physics A   [SJR: 0.535]   [H-I: 121]   [7 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Print) 0947-8396 - ISSN (Online) 1432-0630    Published by Springer-Verlag  [2329 journals]
• Effect of doping on optical properties in BiMn 1−x (TE) x O 3 (where x
= 0.0, 0.1 and TE = Cr, Fe, Co, Zn) nanoparticles synthesized by
microwave and sol-gel methods
• Authors: Neha Bhardwaj; Anurag Gaur; Kamlesh Yadav
Abstract: The structural, optical, and dielectric properties of polycrystalline BiMn1−x TE x O3 (x = 0, 0.1 and TE = Cr, Fe, Co, and Zn) samples synthesized by microwave-assisted synthesis, and sol-gel techniques have been studied. It is found from the XRD data for samples synthesized by both the methods that the lattice volume and average grain size of the prepared samples decrease with doping Cr, Fe, Co, and Zn, consequently. Furthermore, the optical properties obtained from FTIR confirmed that bandgap increases and refractive index decreases on doping transition element in the same order as Cr, Fe, Co, and Zn for samples synthesized by both the methods. The grain sizes obtained for the samples in case of sol-gel method are less than the samples synthesized by microwave method. It is due to less agglomeration of particles in the samples prepared by sol-gel method. P–E loops are measured at room temperature. The variations of dielectric constant and loss tangent with the frequency are plotted. The value of dielectric constant increases for Zn doped sample and then decreases for Cr, Co, and Fe doped samples, respectively. The correlation between the observed structural, optical, and dielectric properties has been described in this paper.
PubDate: 2017-05-20
DOI: 10.1007/s00339-017-1042-y
Issue No: Vol. 123, No. 6 (2017)

• Li concentration dependence of structural properties and optical band gap
of Li-doped ZnO films
• Authors: Karima Meziane; Ahmed El Hichou; Asmae El Hamidi; Mostafa Chhiba; Abdellatif Bourial; Abdelmajid Almaggoussi
Abstract: Li-doped and undoped Zinc oxide thin film by the sol–gel method and spin-coated on glass substrate, and the effect of doping on structural, optical and stress properties have been investigated. X-ray diffraction analysis showed that all the films are polycrystalline with a hexagonal wurtzite structure. For a low amount of Li up to 12%, the texture coefficient increases with the Li amount ensuring an improvement of the c-axis orientation and the crystallinity. The crystallite size seems slightly affected and ranged in the nanometer range. Beyond this, Li amount value, the texture coefficient decreases drastically showing deterioration in the growth of ZnO along c-axis. Scanning electron microscopy (SEM) images show that the morphology of films was highly influenced by Li incorporation. For Li amount exceeding 12%, SEM images show the appearance of some cracks. The optical results revealed an improvement of the total transmission when increasing the Li amount up to 12%. A linear decrease of band gap energy with the Li content was observed. The stress was calculated and found depending on the Li amount analogously to the band gap energy. Thus, the band gap energy and the stress are correlated.
PubDate: 2017-05-20
DOI: 10.1007/s00339-017-1039-6
Issue No: Vol. 123, No. 6 (2017)

• Optimal design of self-similar serpentine interconnects embedded in
stretchable electronics
• Authors: Wentao Dong; Chen Zhu; Dong Ye; YongAn Huang
Abstract: The order-2 self-similar serpentine interconnects (SSIs) that joint rigid, functional devices can ensure mechanical integrity and stretchability in electronic systems under large deformations. However, the conventional design and analysis aim merely at the freestanding order-2 SSIs. The paper studies the design law and the stretchability of order-2 SSI that are bonded onto the polydimethylsiloxane (PDMS) substrate in stretchable electronics through analytical modeling, finite element method (FEM), and experiments. The scale law formula is built to predict the stretchability of the order-2 SSI with geometry parameters based on FEM simulation results. The out-of-plane and in-plane bending strains during lateral postbuckling processes are proportional to the thickness and width of the order-2 SSI, respectively. The stretchability of order-2 SSI decreases with the increasing ratio β of order-2 space L 2 to order-1 space L 1, and it would be approximate to the stretchability of order-1 serpentine interconnect when β > 32. The optimized order-2 SSI is demonstrated in stretchable electronics application with high stretchability.
PubDate: 2017-05-20
DOI: 10.1007/s00339-017-0985-3
Issue No: Vol. 123, No. 6 (2017)

• Non-invasive dendrochronology of late-medieval objects in Oslo: refinement
of a technique and discoveries
• Authors: Aoife Daly; Noëlle L. W. Streeton
Abstract: A technique for non-invasive dendrochronological analysis of oak was developed for archaeological material, using an industrial CT scanner. Since 2013, this experience has been extended within the scope of the research project ‘After the Black Death: Painting and Polychrome Sculpture in Norway’. The source material for the project is a collection of late-medieval winged altarpieces, shrines, polychrome sculpture, and fragments from Norwegian churches, which are owned by the Museum of Cultural History, University of Oslo. The majority cannot be sampled, and many are too large to fit into the CT scanner. For these reasons, a combined approach was adopted, utilizing CT scanning where possible, but preceded by an ‘exposed-wood’ imaging technique. Both non-invasive techniques have yielded reliable results, and CT scanning has confirmed the reliability of the imaging technique alone. This paper presents the analytical methods, along with results from two of the 13 objects under investigation. Results for reliable dates and provenances provide new foundations for historical interpretations.
PubDate: 2017-05-20
DOI: 10.1007/s00339-017-1019-x
Issue No: Vol. 123, No. 6 (2017)

• Solid-state synthesis of nano-sized Ba(Ti 1−x Sn x )O 3 powders and
dielectric properties of corresponding ceramics
• Authors: Md. Jawed Ansaree; Upendra Kumar; Shail Upadhyay
Abstract: Powders of a few compositions of solid solution BaTi1−x Sn x O3 (x = 0.0, 0.1, 0.2, 0.3 and 0.40) have been synthesized at 800 °C for 8 h using Ba(NO3)2, TiO2 and SnCl4·5H2O as starting materials. The thermogravimetric (TG) and differential scanning calorimetric (DSC) analysis of mixture in the stoichiometric proportion for sample BaTi0.80Sn0.20O3 have been carried out to understand the formation of solid solutions. Single-phase pure compounds (except x = 0.40) of the samples have been obtained at a lower calcination temperature (800 °C) than that of those reported in the literature for traditional solid-state synthesis making use of oxides and or carbonates as starting material (≥1200 °C). Tetragonal symmetry for compositions x = 0.0 and 0.10, cubic for x = 0.2 and 0.30 were found by X-ray diffraction (XRD) analysis. The transmission electron microscopic (TEM) analysis confirmed that calcined powders have a particle size between 30 and 50 nm. Ceramics of these powders were prepared by sintering at 1350 °C for 4 h. Properties of ceramics obtained in this work have been compared with properties reported in the literature.
PubDate: 2017-05-20
DOI: 10.1007/s00339-017-1047-6
Issue No: Vol. 123, No. 6 (2017)

• Fabrication of oxidation-resistant Ge colloidal nanoparticles by pulsed
laser ablation in aqueous HCl
• Authors: Yasushi Hamanaka; Masahiro Iwata; Junichi Katsuno
Abstract: Spherical Ge nanoparticles with diameters of 20–80 nm were fabricated by laser ablation of a Ge single crystal in water and in aqueous HCl using sub-picosecond laser pulses (1040 nm, 700 fs, 100 kHz, and a pulse energy of 10 µJ). We found that the as-synthesized nanoparticles suffered rapid oxidization followed by dissolution when laser ablation was conducted in pure water. In contrast, oxidation of Ge nanoparticles produced in dilute HCl and stored intact was minimal, and colloidal dispersions of the Ge nanoparticles remained stable up to 7 days. It was elucidated that dangling bonds on the surfaces of the Ge nanoparticles were terminated by Cl, which inhibited oxidation, and that such hydrophilic surfaces might improve the dispersibility of nanoparticles in aqueous solvent.
PubDate: 2017-05-19
DOI: 10.1007/s00339-017-1044-9
Issue No: Vol. 123, No. 6 (2017)

• Novel phenomenon of magnetism and superconductivity in Fe-doped
superconductor Bi 4−x Fe x O 4 S 3 ( $$0 \le x \le 0.1$$ 0 ≤ x ≤ 0.1
)
• Authors: Qing Li; Difei Wang; Zhenjie Feng; Chuan Yu; Hao Chu; Xunqing Yin; Jian Kang; Cheng Cheng; Xiaolong Li; Dongmei Deng; Chao Jing; Shixun Cao; Jincang Zhang
Abstract: We report the effects of Fe doping on the BiS2-based superconductor Bi4O4S3. It has been found that the superconducting transition temperature ( $$T_{\text{C}}^{\text{onset}}$$ ) is slightly enhanced by Fe doping. The magnetic susceptibility results reveal the coexistence of superconductivity and long-range ferrimagnetism in these samples. A new magnetic transition temperature T V (Verwey transition) from the M–T curves at ~112 K is observed. The isothermal magnetization curves (M–H) indicate a weak ferrimagnetism, which is probably due to the antiparallel ordering of Fe2+ and Fe3+ magnetic moments. The coexistence of superconductivity and ferro/ferrimagnetism makes bismuth oxysulfide superconductor a platform for understanding superconductivity from a new perspective.
PubDate: 2017-05-19
DOI: 10.1007/s00339-017-1043-x
Issue No: Vol. 123, No. 6 (2017)

• Preparation of textural lamellar tin deposits via electrodeposition
• Authors: Xiaoyu Wen; Xiaona Pan; Libin Wu; Ruinan Li; Dan Wang; Jinqiu Zhang; Peixia Yang
Abstract: Lamellar tin deposits were prepared by galvanostatical electroplating from the aqueous acidic-sulfate bath, with gelatin and benzalacetone dissolved in ethanol (ABA+EtOH) as additive, and their morphologies were investigated by scanning electron microscopy. Cathodic polarization curves revealed that the absorbability of ABA+EtOH on the cathode surface was higher than that of gelatin. X-ray diffraction analysis indicated preferred orientations of tin growth led to the formation of lamellar structure and distortion of tin lattice. The growth mechanism of lamellar tin was also discussed.
PubDate: 2017-05-19
DOI: 10.1007/s00339-017-0960-z
Issue No: Vol. 123, No. 6 (2017)

• One-step hydrothermal synthesis of In 2.77 S 4 nanosheets with efficient
photocatalytic activity under visible light
• Authors: Xiang-feng Wu; Hui Li; Yang Sun; Yi-jin Wang; Chen-xu Zhang; Xiao-dong Gong; Yu-duan Wang; Yu Liu; Xin-yue Yang
Abstract: In2.77S4 nanosheets with the band gap energy of 1.75 eV were fast prepared via a hydrothermal process. The structure, morphology and optical properties of the as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy, respectively. Rhodamine B, methyl orange and potassium dichromate solution were used to evaluate the degradation efficiency of the as-prepared samples under the visible light, respectively. Experimental results showed that the molar ratio of thioacetamide to indium nitrate hydrate significantly influenced the structure and properties of the as-prepared products. With increasing the molar ratio, the degradation efficiency of rhodamine B solution was firstly increased and then decreased. When the molar ratio was 4:1, the degradation efficiency of the as-prepared sample reached to 96% in 3 min and 100% in 9 min. Moreover, this semiconductor could degrade 88% of methyl orange solution in 30 min and 87% of potassium dichromate solution in 60 min, respectively.
PubDate: 2017-05-19
DOI: 10.1007/s00339-017-1016-0
Issue No: Vol. 123, No. 6 (2017)

• Fabrication of reduced graphene oxide nanosheets doped PVA composite films
for tailoring their opto-mechanical properties
• Authors: Muhammad Aslam; Mazhar Ali Kalyar; Zulfiqar Ali Raza
Abstract: Laminar graphene nanosheets have raised passionate attention due to their incredible physico-chemical properties. Its wide-scale, high-yield production at low-cost has made it possible to produce top class promising versatile polymer nanocomposites. Reduced graphene oxide (RGO) nanosheets were incorporated to prepare optically tunable and high mechanical strength polymer nanocomposite films. RGO-doped poly(vinyl alcohol) (PVA) nanocomposite films were prepared via solution casting. Low level RGO doping significantly altered the structural, optical and mechanical properties of pure PVA films. Most of the band structure parameters like direct/indirect band gap, band tail, refractive index, dielectric constant, optical conductivity and dispersion parameters were investigated in detail for the first time. Tauc’s, Wemple–DiDomenico, Helpin–Tsai and mixture rule models were employed to investigate optical and mechanical parameters. The applied models reinforced the experimental results in the present study. Advanced analytical techniques were engaged to characterize the nanocomposites films.
PubDate: 2017-05-19
DOI: 10.1007/s00339-017-1035-x
Issue No: Vol. 123, No. 6 (2017)

• Impedance and modulus spectroscopy of poly(vinyl alcohol)-Mg[ClO 4 ] 2
salt hybrid films
• Authors: Reda Khalil
Abstract: The electrical and dielectric properties of PVA/Mg[ClO4]2 hybrid films were investigated in the temperature range of 90–150 °C and the frequency range of 20 Hz–10 MHz using impedance and modulus spectroscopy. Impedance and modulus analyses had indicated the temperature independent distribution of relaxation times and the non-Debye behavior in these composites. The co-operative motion due to strong coupling between the mobile Mg2+ ions is assumed to give rise to non-Debye type of relaxation. Complex impedance Nyquist plots are used to interpret the relaxation mechanism. The nature of Nyquist plot confirms the presence of bulk effects, grain boundaries and electrolyte/electrode polarization, and non-Debye type of relaxation processes occurs in the composites. A thermally activated relaxation was observed, which was ascribed to be a non-Debye-type relaxation caused by the mobility of magnesium ion in polymer matrix. A comparison between Z″, imaginary part of complex impedance, and M″, imaginary part of complex electric modulus, indicates that the short- and long-range charge motion dominates at low and high temperatures, respectively. The activation energies, which were obtained from the electric modulus and bulk conductivity, are matched well. The non-coincidence of peaks corresponding to the modulus and impedance indicates deviation from Debye-type relaxation.
PubDate: 2017-05-18
DOI: 10.1007/s00339-017-1026-y
Issue No: Vol. 123, No. 6 (2017)

• Effect of pH value of probe molecule on the graphene oxide-based surface
enhanced Raman scattering
• Authors: Shao-li Cui; Xiao-qing Du; Chao Zeng; Lu Li; Jun Bao
Abstract: The dependence of graphene oxide (GO)-based surface enhanced Raman scattering (SERS) on the pH value of probe molecule was investigated. Water-soluble copper phthalocyanine (TSCuPc) was used as probe molecule and its pH value was adjusted with HCl and NaOH solution. The Raman spectra of TSCuPc with pH equaling 3, 8, and 11 on GO base were tested, respectively. The results show that both Raman enhanced intensity and full width at half maximum (FWHM) of characteristic peaks vary with the pH value of TSCuPc. It is shown that there is no obvious spectral widening of TSCuPc characteristic peaks when TSCuPc is neutral or acidic, and the chemical enhancement intensity of neutral TSCuPc on GO is biggest. In contrast, when TSCuPc is alkaline, the characteristic Raman peaks between 1350 and 1600 cm−1 of TSCuPc on GO are much wider and the intensities of characteristic peaks decrease considerably. The reasons for the pH dependence of GO-based Raman spectra were explored by comparing the wettability of molecule droplet on GO and the absorbance of different pH-adjusted TSCuPc films. It is found that the effect of molecule’s pH value on SERS can be contributed to the differences of concentration and distributions on GO surface for varied pH-treated molecule.
PubDate: 2017-05-18
DOI: 10.1007/s00339-017-1010-6
Issue No: Vol. 123, No. 6 (2017)

• Dual-band microstrip patch antenna based on metamaterial refractive
surface
• Authors: Ridha Salhi; Mondher Labidi; Mohamed Ali Boujemaa; Fethi Choubani
Abstract: In this paper, we present a new design of microstrip patch antenna based on metamaterial refractive surface (MRS). By optimizing the air gap between the MRS layer and the patch antenna to be 7 mm, the band width and the gain of the proposed antenna are significantly enhanced. The proposed prototype presents a dual band antenna. The center frequency for the first band is 2.44 GHz and the generated bandwidth is 25 MHz. The second band has a center frequency of 2.8 GHz and with a bandwidth of 50 MHz. The simulation results are analyzed and discussed in terms of return loss, gain and radiation pattern using electromagnetic simulator software. Finally, the designed dual band antenna is fabricated and different measurement results are performed and compared with simulation results in order to validate its performances. The proposed antenna supports WiBro (wireless broadband), ISM, WiFi, Bluetooth, WiMAX and radars services.
PubDate: 2017-05-18
DOI: 10.1007/s00339-017-1030-2
Issue No: Vol. 123, No. 6 (2017)

• The nano-fractal structured tungsten oxides films with high thermal
stability prepared by the deposition of size-selected W clusters
• Authors: Eun Ji Park; Andreas Dollinger; Lukas Huether; Moritz Blankenhorn; Kerstine Koehler; Hyun Ook Seo; Young Dok Kim; Gerd Gantefoer
Abstract: Size-selected W n − clusters (n = 1650) were deposited on the highly ordered pyrolytic graphite surface at room temperature under high vacuum conditions by utilizing a magnetron sputtering source and a magnet sector field. Moreover, geometrical structure and surface chemical states of deposited clusters were analyzed by in situ scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy, respectively. The formation of 2-D islands (lateral size ~150 nm) with multiple dendritic arms was observed by STM, and the structure of the individual W1650 clusters survived within the dendritic arms. To study the thermal stability of the nano-fractal structure under the atmospheric conditions, the sample was brought to the ambient air conditions and sequentially post-annealed at 200, 300, and 500 °C in the air. The nano-fractal structure was maintained after the 1st post-annealing process at 200 °C for 1 h in the air, and the subsequent 2nd post-annealing at 300 °C (for 1 h, in the air) also did not induce any noticeable change in the topological structure of the sample. The topological changes were observed only after the further post-annealing at a higher temperature (at 500 °C, 1 h) in the air. We show high potential use of these nano-structured films of tungsten oxides in ambient conditions.
PubDate: 2017-05-17
DOI: 10.1007/s00339-017-1037-8
Issue No: Vol. 123, No. 6 (2017)

• TiO 2 quantum dots grown on graphene by atomic layer deposition as
• Authors: Liu Yang; Li Jiang; Wensheng Fu; Alan W. Weimer; Xue Hu; Yun Zhou
Abstract: The interfacial charge transfer phenomenon between atomic layer deposition (ALD) TiO2 and graphene substrate was investigated. A significant photocatalytic enhancement of TiO2 quantum dots/graphene hybrid nanocomposite over P25 TiO2 and TiO2 ALD film/graphene was observed. A control experiment with a conformal Al2O3 ALD film between ALD TiO2 film and graphene substrates provides direct evidences for this photocatalytic enhancement.
PubDate: 2017-05-17
DOI: 10.1007/s00339-017-1018-y
Issue No: Vol. 123, No. 6 (2017)

• N-type nano-silicon powders with ultra-low electrical resistivity as anode
materials in lithium ion batteries
• Authors: Zhihao Yue; Lang Zhou; Chenxin Jin; Guojun Xu; Liekai Liu; Hao Tang; Xiaomin Li; Fugen Sun; Haibin Huang; Jiren Yuan
Abstract: N-type silicon wafers with electrical resistivity of 0.001 Ω cm were ball-milled to powders and part of them was further mechanically crushed by sand-milling to smaller particles of nano-size. Both the sand-milled and ball-milled silicon powders were, respectively, mixed with graphite powder (silicon:graphite = 5:95, weight ratio) as anode materials for lithium ion batteries. Electrochemical measurements, including cycle and rate tests, present that anode using sand-milled silicon powder performed much better. The first discharge capacity of sand-milled silicon anode is 549.7 mAh/g and it is still up to 420.4 mAh/g after 100 cycles. Besides, the D50 of sand-milled silicon powder shows ten times smaller in particle size than that of ball-milled silicon powder, and they are 276 nm and 2.6 μm, respectively. In addition, there exist some amorphous silicon components in the sand-milled silicon powder excepting the multi-crystalline silicon, which is very different from the ball-milled silicon powder made up of multi-crystalline silicon only.
PubDate: 2017-05-17
DOI: 10.1007/s00339-017-1036-9
Issue No: Vol. 123, No. 6 (2017)

• Pictorial materials database: 1200 combinations of pigments, dyes, binders
and varnishes designed as a tool for heritage science and conservation
• Authors: Tiziana Cavaleri; Paola Buscaglia; Simonetta Migliorini; Marco Nervo; Gabriele Piccablotto; Anna Piccirillo; Marco Pisani; Davide Puglisi; Dario Vaudan; Massimo Zucco
Abstract: The conservation of artworks requires a profound knowledge about pictorial materials, their chemical and physical properties and their interaction and/or degradation processes. For this reason, pictorial materials databases are widely used to study and investigate cultural heritage. At Centre for Conservation and Restoration La Venaria Reale, we prepared a set of about 1200 mock-ups with 173 different pigments and/or dyes, used across all the historical times or as products for conservation, four binders, two varnishes and four different materials for underdrawings. In collaboration with the Laboratorio Analisi Scientifiche of Regione Autonoma Valle d’Aosta, the National Institute of Metrological Research and the Department of Architecture and Design of the Polytechnic of Turin, we created a scientific database that is now available online (http://www.centrorestaurovenaria.it/en/areas/diagnostic/pictorial-materials-database) designed as a tool for heritage science and conservation. Here, we present a focus on materials for pictorial retouching where the hyperspectral imaging application, conducted with a prototype of new technology, allowed to provide a list of pigments that could be more suitable for conservation treatments and pictorial retouching. Then we present the case study of the industrial painting Notte Barbara (1962) by Pinot Gallizio where the use of the database including modern and contemporary art materials showed to be very useful and where the fibre optics reflectance spectroscopy technique was decisive for pigment identification purpose. Later in this research, the mock-ups will be exploited to study degradation processes, e.g., the lightfastness, or the possible formation of interaction products, e.g., metal carboxylates.
PubDate: 2017-05-17
DOI: 10.1007/s00339-017-1031-1
Issue No: Vol. 123, No. 6 (2017)

• Nonlinear behavior of microwave semiconductor materials measured under a
strong electromagnetic environment using a compressed rectangular resonant
cavity
• Authors: E. Li; Y. Gao; Y. Zhang; C. Gao; H. Zheng; Z. Zeng
Abstract: The dielectric property of microwave semiconductor materials is investigated under a strong electromagnetic field environment through a compressed rectangular cavity around the frequency of 2.45G. It is demonstrated that the dielectric property of indium phosphate (InP), a kind of microwave semiconductor material, changes when a larger power is injected into the designed cavity. The injected power changes the strength of the electric field in the cavity. Measurement results show that InP has an obvious nonlinear dielectric property when a strong electromagnetic field acts on the material. According to effective experimental method and theoretical analysis, we conclude that the nonlinear behavior is not caused by microwave heating, but caused by the material’s inherent nonlinearity.
PubDate: 2017-05-16
DOI: 10.1007/s00339-017-1025-z
Issue No: Vol. 123, No. 6 (2017)

• Crystallization and atomic diffusion behavior of high coercive
Ta/Nd–Fe–B/Ta-based permanent magnetic thin film
• Authors: Na Tian; Xiao Zhang; Caiyin You; Huarui Fu; Qianlong Shen
Abstract: A high coercivity of about 20.4 kOe was obtained through post-annealing the sputtered Ta/Nd–Fe–B/Ta-based permanent magnetic thin films. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses were performed to investigate the crystallization and atomic diffusion behaviors during post-annealing. The results show that the buffer and capping Ta layers prefered to intermix with Fe and B atoms, and Nd tends to be combined with O atoms. The preferred atomic combination caused the appearance of the soft magnetic phase of Fe–Ta–B, resulting in a kink of the second quadratic magnetic hysteresis loop. The preferred atomic diffusion and phase formation of the thin films were well explained in terms of the formation enthalpy of the various compounds.
PubDate: 2017-05-16
DOI: 10.1007/s00339-017-1038-7
Issue No: Vol. 123, No. 6 (2017)

• Gate misalignment effects on analog/RF performance of charge plasma-based
doping-less tunnel FET
• Authors: Sunny Anand; R. K. Sarin
Abstract: In this paper, gate misalignment effect on charge plasma-based doping-less tunnel FET (DLTFET) is demonstrated for the first time. The effects of bottom gate misalignment on either towards source (GMAS) or towards drain (GMAD) are then compared with the conventional doped TFET (DGTFET). This paper also discusses the effect of misalignment on the bases of different analog/RF parameters such as transconductance (g m ), output conductance (g d ), intrinsic gain (A V ), total gate capacitance (C gg ), and cut-off frequency (f T ). When bottom gate is misaligned towards source, DLTFET provides a better performance than DGTFET and shows the best results when the device is 50% misaligned. While gate misalignment towards drain, both devices show similar performance and degrade with the increase in misalignment. The DLTFET is found to have a better tolerance to the different misalignment configurations than DGTFET.
PubDate: 2017-05-16
DOI: 10.1007/s00339-017-1029-8
Issue No: Vol. 123, No. 6 (2017)

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