TY - JOUR
T1 - Controlling the work function of GaAs by chemisorption of benzoic acid derivatives
AU - Bastide, Stephane
AU - Butruille, Raphael
AU - Cahen, David
AU - Dutta, Amit
AU - Libman, Jacqueline
AU - Shanzer, Abraham
AU - Sun, Limin
AU - Vilan, Ayelet
PY - 1997/4/3
Y1 - 1997/4/3
N2 - Control of the work function of GaAs single crystals, under ambient conditions, was achieved by chemisorption of a series of benzoic acid derivatives with varying dipole moments. Quantitative Fourier transform infrared spectroscopy shows that the benzoic acid derivatives bind as carboxylates, via coordination to oxidized Ga or As atoms, with a surface coverage of about one layer and a binding constant of 2.1 104 M-1 for benzoic acid. Contact potential difference measurements reveal that molecules affect the work function by changing the electron affinity while band bending is not affected significantly. The direction of the electron affinity changes depends on the direction of the dipole moments, and the extent of the change increases linearly with the dipole's magnitude. Investigation of the surface composition by X-ray photoelectron spectroscopy shows that the etched surface, onto which the molecules adsorb, is covered by an oxide layer. This may prevent the molecules from affecting band bending.
AB - Control of the work function of GaAs single crystals, under ambient conditions, was achieved by chemisorption of a series of benzoic acid derivatives with varying dipole moments. Quantitative Fourier transform infrared spectroscopy shows that the benzoic acid derivatives bind as carboxylates, via coordination to oxidized Ga or As atoms, with a surface coverage of about one layer and a binding constant of 2.1 104 M-1 for benzoic acid. Contact potential difference measurements reveal that molecules affect the work function by changing the electron affinity while band bending is not affected significantly. The direction of the electron affinity changes depends on the direction of the dipole moments, and the extent of the change increases linearly with the dipole's magnitude. Investigation of the surface composition by X-ray photoelectron spectroscopy shows that the etched surface, onto which the molecules adsorb, is covered by an oxide layer. This may prevent the molecules from affecting band bending.
UR - http://www.scopus.com/inward/record.url?scp=0000311936&partnerID=8YFLogxK
U2 - 10.1021/jp9626935
DO - 10.1021/jp9626935
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AN - SCOPUS:0000311936
SN - 1520-6106
VL - 101
SP - 2678
EP - 2684
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 14
ER -