Electrochemical impedance study of GaAs surface charge modulation through the deprotonation of carboxylic acid monolayers. Academic Article

abstract

• Modifications to the space charge region of p+ and p-GaAs due to surface charge modulation by the pH-induced deprotonation of bound carboxylic acid terminal monolayers were studied by electrochemical impedance spectroscopy and correlated to flat-band potential measurements from Mott-Schottky plots. We infer that the negative surface dipole formed on GaAs due to monolayer deprotonation causes an enhancement of the downward interfacial band bending. The space charge layer modifications were correlated to intermolecular electrostatic interactions and semiconductor depletion characteristics.

authors

• Castaneda, Homero

published proceedings

• Langmuir

author list (cited authors)

• Camacho-Alanis, F., Castaneda, H., Zangari, G., & Swami, N. S.

citation count

• 7

complete list of authors

• Camacho-Alanis, Fernanda||Castaneda, Homero||Zangari, Giovanni||Swami, Nathan S

publication date

• September 2011

publisher

• American Chemical Society (ACS)  Publisher

published in

• Langmuir: the ACS journal of surfaces and colloids  Journal

keywords

• 0306 Physical Chemistry (incl. Structural)

PubMed Central ID

• 21859118

Digital Object Identifier (DOI)

• 10.1021/la2013107

start page

• 11273

end page

• 11277

volume

• 27

issue

• 18