Chemical and Biomolecular Engineering Faculty Research

Title

Electrochemical Impedance Study of Gaas Surface Charge Modulation Through the Deprotonation of Carboxylic Acid Monolayers

Document Type

Article

Publication Date

Fall 2011

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.

Volume

27

Issue

18

First Page

11273

Last Page

11277