Electrodeposition and characterization of thin selenium films modified with lead ad-atoms


Autoria(s): CABRAL, Murilo F.; SUFFREDINI, Hugo B.; PEDROSA, Valber A.; TANIMOTO, Sonia T.; MACHADO, Sergio A. S.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2008

Resumo

The deposition and characterization of Se films doped with Pb underpotentially deposited (UPD) ad-atoms was studied in this work. The employed experimental techniques were cyclic voltammetry, chronoamperometry, electrochemical impedance spectroscopy, UV-vis spectroscopy and atomic force microscopy. The initial deposition of Se film by chronoamperometry yielded a thin film composed of approximately 700 layers. The Pb UPD on Se was achieved by chronoamperometry in a potential value previously determined in voltammetric experiments. This deposition yielded a deposition charge of approximately 7.5% of the total one. The film resistance altered from 320 Omega cm(2) for Se to 65 Omega cm(2) for the Se/Pb one. Flat band potential values and number of acceptors and donors were also calculated for both films and the values obtained were + 0.95 and -0.51 V for Se and Se/Pb, respectively. The Se coating presented 1.2 x 10(17) cm(3) acceptors while the Se/Pb one presented 3.2 x 10(17) cm(3) donors. The band gap values for both films were 2.4 eV and 1.9 eV, correspondingly. (C) 2008 Elsevier B.V. All rights reserved.

Identificador

APPLIED SURFACE SCIENCE, v.254, n.17, p.5612-5617, 2008

0169-4332

http://producao.usp.br/handle/BDPI/31605

10.1016/j.apsusc.2008.03.038

http://dx.doi.org/10.1016/j.apsusc.2008.03.038

Idioma(s)

eng

Publicador

ELSEVIER SCIENCE BV

Relação

Applied Surface Science

Direitos

restrictedAccess

Copyright ELSEVIER SCIENCE BV

Palavras-Chave #selenium #semiconductor films #UPD #band gap #flat band potential #donors #acceptors #Se/Pb films #ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY #OPTICAL BAND-GAP #UNDERPOTENTIAL DEPOSITION #AMORPHOUS SELENIUM #NANOPARTICLES #CDSE #MONOLAYER #METAL #PBSE #Chemistry, Physical #Materials Science, Coatings & Films #Physics, Applied #Physics, Condensed Matter
Tipo

article

original article

publishedVersion