Search results for: V.R. Dhanak

Items from 1 to 20 out of 67 results

article

P3HT as a pinhole blocking back contact for CdTe thin film solar cells

J.D. Major, L.J. Phillips, M. Al Turkestani, L. Bowen, more

Solar Energy Materials and Solar Cells > 2017 > 172 > Complete > 1-10

A new approach to back contacting CdTe solar cells that uses an organic poly(3-hexythiophene-2,5-diyl) (P3HT) back contact layer is reported. The most striking benefit of P3HT was demonstrated to be through a “pinhole blocking” effect, significantly improving performance uniformity. This was demonstrated through comparison of open circuit voltage values for a large sample set (600 cells) and through...

article

Experimental band alignment of Ta2O5/GaN for MIS-HEMT applications

K. Sawangsri, P. Das, S.N. Supardan, I.Z. Mitrovic, more

Microelectronic Engineering > 2017 > 178 > C > 178-181

The band alignment of Ta₂O₅/GaN has been measured experimentally. The HCl cleaning has been found to be effective in removing oxygen from the GaN surface and was used prior to deposition of the Ta₂O₅ films by radio frequency magnetron sputtering. Variable angle spectroscopic ellipsometry was performed to measure the thickness, optical constants and band gap of GaN and Ta₂O₅/GaN samples. The valence...

article

LEED – IV and DFT study of the co-adsorption of chlorine and water on Cu(100)

M. Puisto, K. Pussi, M. Alatalo, D. Hesp, more

Surface Science > 2017 > 657 > C > 51-57

We have studied the adsorption of water on a Cl covered Cu(100) surface using both low energy electron diffraction (LEED) experiments and density functional theory (DFT) calculations. On the Cu{100}-c(2×2)-Cl surface water is shown to form a bilayer, which is weakly bound to the surface.

article

Hafnia and alumina on sulphur passivated germanium

M. Althobaiti, S. Mather, N. Sedghi, V.R. Dhanak, more

Vacuum > 2015 > 122 > Part B > 306-309

In this work hafnia (HfO₂) and alumina (Al₂O₃) films were deposited on germanium, using either water or oxygen plasma as the oxidant, by atomic layer deposition at 250 °C with and without sulphur passivation of the substrate. X-ray photoelectron spectroscopy was carried out to investigate the interface between both HfO₂ and Al₂O₃ films and germanium. The results show that for hafnia and alumina deposited...

article

The templated growth of a chiral transition metal chalcogenide

M.O. King, I.M. McLeod, D. Hesp, V.R. Dhanak, more

Surface Science > 2014 > 629 > C > 94-101

We demonstrate that an intrinsically chiral, high Miller index surface of an achiral metal can be used to template the enantioselective growth of chiral transition metal chalcogenide films. Specifically, Cu(643)^R can be used as a template for the enantioselective growth of a chiral copper telluride alloy surface. Beyond a critical alloy thickness the chiral influence of the Cu(643)^R surface diminishes...

article

The structural analysis of Cu(111)-Te 3×3R30° and 23×23R30° surface phases by quantitative LEED and DFT

M. Lahti, A. Chaudhuri, K. Pussi, D. Hesp, more

Surface Science > 2014 > 622 > Complete > 35-43

The chemisorption of tellurium on atomically clean Cu(111) surface has been studied under ultra-high vacuum conditions. At room temperature, the initial stage of growth was an ordered 23×23R30° phase (0.08ML). An ordered 3×3R30° phase is formed at 0.33ML coverage of Te. The adsorption sites of the Te atoms on the Cu(111) surface at 0.08ML and 0.33ML coverages are explored by quantitative low energy...

article

STM and XPS investigation of the oxidation of the Al4(Cr,Fe) quasicrystal approximant

J.K. Parle, A. Beni, V.R. Dhanak, J.A. Smerdon, more

Applied Surface Science > 2013 > 283 > Complete > 276-282

The oxidation of the Al ₄ (Cr, Fe) quasicrystal approximant has been studied using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). STM data indicate that the initial oxidation on the (100) surface proceeds in a highly ordered fashion. Oxygen preferentially adsorbs onto the surface of terraces, and step edges remain intact. The STM images show ordered stripes...

article

Interface engineering of Ge using thulium oxide: Band line-up study

I.Z. Mitrovic, M. Althobaiti, A.D. Weerakkody, N. Sedghi, more

Microelectronic Engineering > 2013 > 109 > Complete > 204-207

This paper investigates the band line-up and optical properties (dielectric function) of Tm ₂ O ₃ /Ge gate stacks deposited by atomic layer deposition. X-ray photoelectron spectroscopy has been performed to ascertain the shallow core levels (Ge3d and Tm4d) in ultra-thin and bulk Tm ₂ O ₃ /Ge stacks as well as valence band maxima in Ge and bulk Tm ₂ O ₃ ...

article

In situ formation of onion-like carbon from the evaporation of ultra-dispersed nanodiamonds

S. Krishnamurthy, Yu.V. Butenko, V.R. Dhanak, M.R.C. Hunt, more

Carbon > 2013 > 52 > Complete > 145-149

We report the in situ formation of onion-like carbon (OLC) by evaporation from a nanodiamond source under ultra-high vacuum conditions. The OLC is characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) and is found to be highly defective but completely separated. The absence of any signature in XPS, Raman...

article

Effect of oxygen on tuning the TiNx metal gate work function on LaLuO3

I.Z. Mitrovic, H.M. Przewlocki, K. Piskorski, G. Simutis, more

Thin Solid Films > 2012 > 520 > 23 > 6959-6962

This paper presents experimental evidence on effective work function tuning due to the presence of oxygen at the TiNx/LaLuO ₃ interface. Two complementary techniques, internal photoemission and X-ray photoelectron spectroscopy, show good agreement on the position of the metal gate Fermi level to conduction (2.79±0.25eV) and valence (2.65±0.08eV) band edge for TiNx/bulk LaLuO ₃ gate...

article

Growth and alloying of thin film Te on Cu(111)

M.O. King, I.M. McLeod, D. Hesp, V.R. Dhanak, more

Surface Science > 2012 > 606 > 17-18 > 1353-1359

We explore the growth and temperature-dependent alloying of Te on Cu(111) using a combination of low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS) and scanning tunnelling microscopy (STM). Below 275K, growth is rough and disordered. Above 275K, there are two distinct surface phases: a surface substitutional alloy for coverages...

article

Surface structure of In2O3(111) (1×1) determined by density functional theory calculations and low energy electron diffraction

K. Pussi, A. Matilainen, V.R. Dhanak, A. Walsh, more

Surface Science > 2012 > 606 > 1-2 > 1-6

The surface structure of In ₂ O ₃ (111) has been investigated by dynamical analysis of low energy electron diffraction data, in conjunction with first principles calculations using density functional theory. The experimental data set consisted of eight independent beams whose intensities were measured for incident energies in the range between 25eV and 250eV. In fitting the experimental...

article

Study of interfaces and band offsets in TiN/amorphous LaLuO3 gate stacks

I.Z. Mitrovic, G. Simutis, W.M. Davey, N. Sedghi, more

Microelectronic Engineering > 2011 > 88 > 7 > 1495-1498

TiN/LaLuO ₃ (LLO) gate stacks formed by molecular beam deposition have been investigated by X-ray photoelectron spectroscopy, medium energy ion scattering, spectroscopic ellipsometry, scanning transmission electron microscopy, electron energy loss spectroscopy and atomic force microscopy. The results indicate an amorphous structure for deposited LLO films. The band offset between the Fermi...

article

Comparison of the electronic structure of LnBaCo2O5+δ (Ln=Gd, Dy; Ln-112) and LnBaCo4O7 (Ln=Yb; Ln-114) single-crystal surfaces using resonant photoemission

H.M. Rafique, W.R. Flavell, A.G. Thomas, K.L. Syres, more

Journal of Electron Spectroscopy and Related Phenomena > 2011 > 184 > 3-6 > 227-231

A comparison of the electronic structure of LnBaCo ₂ O ₅₊₍ (Ln=Gd, Dy; Ln-112) and LnBaCo ₄ O _7+δ (Ln=Yb; Ln-114) single-crystal surfaces has been made using synchrotron photoemission spectroscopy. Resonant photoemission is used to identify the atomic parentage of the valence band states of Ln-114. The states close to the Fermi energy are found to be of mixed Co 3d/O...

article

Structure determination of the p3×3R30∘ Bi–Ag(111) surface alloy using LEED I–V and DFT analyses

I.M. McLeod, V.R. Dhanak, A. Matilainen, M. Lahti, more

Surface Science > 2010 > 604 > 17-18 > 1395-1399

The deposition of 1/3 of a monolayer of Bi on Ag(111) leads to the formation of BiAg ₂ surface alloy with a long range ordered 3×3R30∘ superstructure. A detailed analysis of this structure using LEED I–V measurements together with DFT calculations is presented. We find strong correlation between experimental and calculated LEED I–V data, with the fit between the two data sets having a Pendry's...

article

The local adsorption structure of methylthiolate and butylthiolate on Au(111): A photoemission core-level shift investigation

A. Chaudhuri, T.J. Lerotholi, D.C. Jackson, D.P. Woodruff, more

Surface Science > 2010 > 604 > 2 > 227-234

Measurements of the core-level shifts in Au 4f photoemission spectra from Au(111) at different coverages of methylthiolate and butylthiolate are reported. Adsorption leads to two components in addition to that from the bulk, one at lower photoelectron binding energy attributed to surface atoms not bonded to thiolate species, while the second component has a higher binding energy and is attributed...

article

C60 submonolayers on the Si(111)-(7×7) surface: Does a mixture of physisorbed and chemisorbed states exist?

S. Gangopadhyay, R.A.J. Woolley, R. Danza, M.A. Phillips, more

Surface Science > 2009 > 603 > 18 > 2896-2901

We have carried out a combined X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy(UPS), and scanning tunnelling microscopy (STM) study of the C ₆₀ -Si(111) interaction where the XPS/UPS spectrometer and STM are integrated on a single UHV system. This enables a direct comparison of the XPS/UPS spectra with the STM data and eliminates any uncertainty in C ₆₀ ...

article

The local adsorption site of methylthiolate on Au(111): Bridge or atop?

D.C. Jackson, A. Chaudhuri, T.J. Lerotholi, D.P. Woodruff, more

Surface Science > 2009 > 603 > 5 > 807-813

Measurements of the local adsorption geometry of the S head-group atom in the Au(111)(√3×√3)R30°–CH ₃ S surface have been made using normal incidence X-ray standing waves (NIXSW) and S 1s scanned-energy mode photoelectron diffraction on the same surface preparations. The results confirm that the local adsorption site is atop an Au atom in a bulk-continuation site with a S–Au bondlength of...

article

Spin-resolved two-photon photoemission on Fe77B16Si5 alloy

C.M. Cacho, V.R. Dhanak, L.B. Jones, C.J. Baily, more

Journal of Electron Spectroscopy and Related Phenomena > 2009 > 169 > 2-3 > 62-66

We have explored the spin polarisation of excited electrons in amorphous ferromagnetic iron–boron alloy by spin-resolved two-photon photoemission. These measurements were carried out with a spin resolved electron Time-of-Flight (ToF) analyser combined to a femtosecond laser source. The low kinetic energy was probed by caesium preparation of the sample surface. A constant spin polarisation of 18% was...

article

Adsorption, orientation and thermal decomposition of copper(II) hexafluoroacetylacetonate on rutile TiO2(110)

J.S. Mulley, R.A. Bennett, V.R. Dhanak

Surface Science > 2008 > 602 > 18 > 2967-2974

We have investigated the adsorption and thermal decomposition of copper hexafluoroacetylacetonate (Cu ^II (hfac) ₂ ) on single crystal rutile TiO ₂ (110). Low energy electron diffraction shows that room temperature saturation coverage of the Cu ^II (hfac) ₂ adsorbate forms an ordered (2×1) over-layer. X-ray and ultra-violet photoemission spectroscopy of the saturated...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: V.R. Dhanak

P3HT as a pinhole blocking back contact for CdTe thin film solar cells

Experimental band alignment of Ta2O5/GaN for MIS-HEMT applications

LEED – IV and DFT study of the co-adsorption of chlorine and water on Cu(100)

Hafnia and alumina on sulphur passivated germanium

The templated growth of a chiral transition metal chalcogenide

The structural analysis of Cu(111)-Te 3×3R30° and 23×23R30° surface phases by quantitative LEED and DFT

STM and XPS investigation of the oxidation of the Al4(Cr,Fe) quasicrystal approximant

Interface engineering of Ge using thulium oxide: Band line-up study

In situ formation of onion-like carbon from the evaporation of ultra-dispersed nanodiamonds

Effect of oxygen on tuning the TiNx metal gate work function on LaLuO3

Growth and alloying of thin film Te on Cu(111)

Surface structure of In2O3(111) (1×1) determined by density functional theory calculations and low energy electron diffraction

Study of interfaces and band offsets in TiN/amorphous LaLuO3 gate stacks

Comparison of the electronic structure of LnBaCo2O5+δ (Ln=Gd, Dy; Ln-112) and LnBaCo4O7 (Ln=Yb; Ln-114) single-crystal surfaces using resonant photoemission

Structure determination of the p3×3R30∘ Bi–Ag(111) surface alloy using LEED I–V and DFT analyses

The local adsorption structure of methylthiolate and butylthiolate on Au(111): A photoemission core-level shift investigation

C60 submonolayers on the Si(111)-(7×7) surface: Does a mixture of physisorbed and chemisorbed states exist?

The local adsorption site of methylthiolate on Au(111): Bridge or atop?

Spin-resolved two-photon photoemission on Fe77B16Si5 alloy

Adsorption, orientation and thermal decomposition of copper(II) hexafluoroacetylacetonate on rutile TiO2(110)

Filter options

Publication date

Content availability

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: V.R. Dhanak

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options