Results
author = "Vasilevskiy, Mikhail"
Simple way to make Anatase TiO2 films on FTO glass for promising solar cells
Author(s) :
Raghavender, A. T.
,
Samantilleke, A. P.
,
Sá, Pedro
,
Almeida, B. G.
,
Vasilevskiy, Mikhail
,
Nguyen Hoa Hong
Description :
TiO2 is a wide bandgap semiconductor material used as the photo anode in dye sensitized solar cells (DSSC).
The fabrication of TiO2 on conductive glass substrates plays an important role in the solar cell efficiency, since
the thickness of the TiO2 coating affects the transmission, photoconductive p...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Surface plasmon resonance of sparsely dispersed au nanoparticles in TiO2 photoanode of dye sensitised solar cells
Author(s) :
Samantilleke, A. P.
,
Vasilevskiy, Mikhail
,
Rodrigues, N. F. G.
,
Cerqueira, Fátima
,
Mari, Bernabe
Description :
Plasmonics is an emerging field that makes use of the nanoscale properties of metals, and its application in solar cells has seen a recent surge of interest [1]. Dye-sensitized solar cells (DSSC) were fabricated by incorporating Au NPs into the TiO2 photoanode. The dye absorption is enhanced by the ...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
Portuguese
Impact of disorder on optical phonons confined in CdS nano-crystallites embedded in a SiO2 matrix
Author(s) :
Vasilevskiy, Mikhail
,
Rolo, Anabela G.
,
Gomes, M. J. M.
,
Vikhrova, Olga
,
Ricolleau, Cristian
Description :
Non-resonant Raman spectroscopy studies of a set of CdS films annealed at different temperatures were performed and showed a direct correlation between the width of the Raman peak produced by CdS-like optical phonons and the crystalline quality of the semiconductor phase probed by x-ray diffraction ...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Confined optical vibrations in CdTe quantum dots and clusters
Author(s) :
Rolo, Anabela G.
,
Vasilevskiy, Mikhail
,
Gaponik, Nikolai
,
Talapin, Dmitrii
,
Rogach, Andrey
,
Gomes, M. J. M.
Description :
Absorption of far-infrared (FIR) radiation and Raman scattering in CdTe nano-crystals (spherical quantum dots (QDs) of several nanometers in size) and Cd54Te32(SCH2CH2OH)8- 32 clusters prepared
by colloidal synthesis were studied. Raman spectra of both QDs and clusters are dominated by a peak situat...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
FIR absorption in CdSe quantum dot ensembles
Author(s) :
Vasilevskiy, Mikhail
,
Rolo, Anabela G.
,
Artemyev, Mikhail
,
Filonovich, Sergey
,
Gomes, M. J. M.
,
Rakovich, Yury P.
Description :
Absorption of far-infrared (FIR) radiation in very small CdSe crystallites (quantum dots, QDs) via excitation of confined dipolar vibrational modes was studied, both theoretically and experimentally.
Spatial quantisation of optical phonons was analysed in the framework of a continuum model, which co...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Mixed optical phonon modes in semiconductor nanocrystals synthesized in porous amorphous Al2O3 matrix
Author(s) :
Belogorokhov, Alexander
,
Belogorokhova, Lyuba
,
Miranda, R. P.
,
Vasilevskiy, Mikhail
,
Gavrilov, S. A.
Description :
This work is devoted to experimental and theoretical studies of optical phonons confined in CdS nanocrystals grown inside a porous alumina matrix. The complete sets of phonon modes, confined in a spherical quantum dot and in a cylindrical quantum wire, are considered in the framework of a continuum ...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Electrical and photoelectric properties of PZT 65/35 thin films deposited by sol-gel: competition between ferroelectric and semiconductor properties
Author(s) :
Boerasu, Iulian
,
Pintilie, Lucian
,
Pereira, A. Mário
,
Vasilevskiy, Mikhail
,
Gomes, M. J. M.
Description :
Asymmetric metal–ferroelectric–metal (MFM) structures were manufactured by sol–gel deposition of a lead zirconate-titanate (PZT with Zr/Ti ratio 65/35) film on Pt-coated Si, with a Au top electrode. The average remnant polarization of 9 µC/cm2 and the coercive field of 39 kV/cm were obtained from th...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Exact solution for square-wave grating covered with graphene: Surface plasmon-polaritons in the THz range
Description :
We provide an analytical solution to the problem of scattering of
electromagnetic radiation by a square-wave grating with a flat graphene sheet
on top. We show that for deep groves there is a strong plasmonic response with
light absorption in the graphene sheet reaching more than 45%, due to the
e...
Repository :
arXiv
Language(s) :
Undetermined
Study of the piezoresistivity of doped nanocrystalline silicon thin films
Author(s) :
Gaspar, J.
,
Gieschke, P.
,
Ehling, C.
,
Kistner, J.
,
Gonçalves, N. J.
,
Vasilevskiy, Mikhail
,
Paul, O.
,
Alpuim, P.
Description :
The piezoresistive response of n- and p-type hydrogenated nanocrystalline silicon thin films, deposited by hot-wire (HW) and plasma-enhanced chemical vapor deposition (PECVD) on thermally oxidized silicon wafers, has been studied using four-point bending tests. The piezoresistive gauge factor (GF) w...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English
Resonant raman scattering in CdSxSe1-x nanocrystals : effects of phonon confinement, composition and elastic strain
Author(s) :
Freitas Neto, E. S.
,
Silva, S. W. da
,
Morais, P. C.
,
Vasilevskiy, Mikhail
,
Silva, M. A. Pereira da
,
Dantas, N. O.
Description :
Optical phonon modes confined in CdSxSe1-x nanocrystal (NC) quantum dots (≈ 2 nm in
radius) grown in a glass matrix by the melting-nucleation method, were studied by means
of resonant Raman scattering (RRS)spectroscopy and theoretical modelling. The formation of nanocrystalline quantum dots (QDs) is...
Repository :
RepositóriUM - University of Minho Institutional Repository
Language(s) :
English