Prof. Dr. Paola Prete

Department of Innovation Engineering, University of Salento, Lecce, Puglia, Italy

Prof. Dr. Paola Prete

Department of Innovation Engineering, University of Salento, Lecce, Puglia, Italy

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Academic Career Length

33Years (1994-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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13 June 2011 in Applied Physics Letters

Journal Article

Picosecond response times in GaAs/AlGaAs core/shell nanowire-based photodetectors

Eric M. Gallo

Guannan Chen

Marc Currie

Terrence McGuckin

Paola Prete

Jonathan E. Spanier

High-speed metal-semiconductor-metal (MSM) photodetectors based on Schottky-contacted core/shell GaAs/AlGaAs and bare GaAs nanowires were fabricated and characterized. The measured core/shell temporal response has a

\sim 10 ps

full-width at half-maximum and an estimated corrected value less than 5 ps. The bare GaAs devices exhibit a slower response

(\sim 35 ps)

along with a slow decaying persistent photocurrent

(\sim 80 s)

. The core/shell devices exhibit significantly improved dc and high-speed performance over bare nanowires and comparable performance to planar MSM photodetectors. The picosecond temporal response, coupled with picoampere dark current, demonstrate the potential for core/shell nanowires in high-speed imaging arrays and on-chip optical interconnects.

15 February 1995 in Physical Review B

Journal Article

Exciton spectroscopy in

{Zn}_{1 - x}

{Cd}_{x}

Se/ZnSe quantum wells

R. Cingolani

Paola Prete

D. Greco

P. V. Giugno

Mauro Lomascolo

A. Franciosi

Systematic temperature-dependent studies of optical absorption and photoluminescence in

{Zn}_{1 - x}

{Cd}_{x}

Se/ZnSe strained-layer multiple-quantum-well samples grown by molecular-beam epitaxy were used to evaluate the well-width dependence and the composition dependence of the major excitonic properties. Exciton binding energies calculated by means of a variational method were found in good agreement with the experimental values obtained from the analysis of the absorption line shapes. The well-width dependence of the excitonic eigenstates were well reproduced by envelope-function calculations that included the effect of pseudomorphic strain.

25 August 2005 in The Journal of Physical Chemistry B

Journal Article

Au Nanoparticles Prepared by Physical Method on Si and Sapphire Substrates for Biosensor Applications

J. Spadavecchia

Paola Prete

Nico Lovergine

L. Tapfer

ROBERTO RELLA

1 November 2006 in Journal of Applied Physics

Journal Article

Size and shape control of GaAs nanowires grown by metalorganic vapor phase epitaxy using tertiarybutylarsine

P. Paiano

Paola Prete

Nico Lovergine

A. M. Mancini

Au-catalyzed self-assembly of GaAs nanowires on

(\bar{1} \bar{1} \bar{1}) B

GaAs by metalorganic vapor phase epitaxy is reported between 375 and

500 ° C

, using tertiarybutylarsine and trimethylgallium in

H_{2}

. The nanowires are

[\bar{1} \bar{1} \bar{1}] B

aligned and kink-free. Below

425 ° C

the nanowires have narrow base diameter distributions, closely matching the size

(\sim 60 nm)

of the Au nanoparticles at their tip (no tapering). Above

425 ° C

the nanowires show a hexagonal-based pyramidal shape with base edges normal to the

⟨ \bar{2} 11 ⟩

in-plane substrate directions and base diameters which increase exponentially with temperature, indicating a kinetics limited growth along the nanowire sidewalls. Activation energies in the range of

\sim 20 - 23 kcal ∕ mol

were estimated for growth along both the sidewalls and the

[\bar{1} \bar{1} \bar{1}] B

direction.

15 March 2011 in Journal of Applied Physics

Journal Article

On optical properties of GaAs and GaAs/AlGaAs core-shell periodic nanowire arrays

Zongquan Gu

Paola Prete

Nico Lovergine

Bahram Nabet

Optical reflection, transmission, and absorption in arrays of GaAs and GaAs/AlGaAs core-shell nanowires are studied using transfer matrix and photonic bandgap formalisms, analyzing the effects of size, geometry, height, packing density, and polarization. Energy dependence of the spectra demonstrates optical modes in the dielectric, similar to guided resonant modes, and also the air bands. Simulation of polarization dependence verifies higher absorption with the electric field along the wire axis. Higher absorption at much lower volume compared to thin film, combined with excellent charge transport, make core-shell nanowire arrays excellent candidates for optoelectronics applications.

15 June 1994 in Physical Review B

Journal Article

Recombination mechanisms and lasing in shallow

{Zn}_{0.9}

{Cd}_{0.1}

Se/ZnSe quantum-well structures

R. Cingolani

Rosaria Rinaldi

L. Calcagnile

Paola Prete

P. Sciacovelli

A. Franciosi

Magnetoluminescence spectroscopy of the photopumped stimulated emission, together with systematic photoluminescence studies as a function of the photogeneration rate, were used to identify the main recombination mechanisms occurring in shallow

{Zn}_{0.10}

{Cd}_{0.90}

Se/ZnSe multiple quantum wells for blue-green laser applications. Although the main spontaneous recombination processes have excitonic character, we found that lasing originates from free-carrier transitions.

About Me

Paola Prete, PhD in Physics, is Professor at Department of Innovation Engineering of University of Salento, Lecce, Italy. Before she has been a senior researcher and responsible for the epitaxial growth laboratory of the Institute for Microelectronics and Microsystems (IMM) of the Italian National Research Council (CNR) in Lecce, Italy, since 1998. Visiting staff scientist at Glyndwr University, Wrexham, UK (1996–1997) With more than 30-years of research experience in the field of materials science, her research focuses on MOVPE and MBE growth and spectroscopy of III-V nanostructures synthesized by bottom-up approaches such as core-(multi)shell nanowires for applications to nano- and opto-electronics, sensing, and photovoltaics, and on van der Waals heterostructures based on graphene and graphene-like materials. Author of more than 120 peer-reviewed articles and conference proceedings, more than 200 contributions to international conferences, and several invited presentations. Awarded by the Italian Association of Crystallography the Young Scientist Prize (2000). Chair of International and National Congresses and Schools. Advisory Committee member of numerous international conferences.

Prof. Dr. Paola Prete

Prof. Dr. Paola Prete

Research Focus & Metrics

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Representative Publications

About Me