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Title: Amorphous transparent conducting oxides in context: Work function survey, trends, and facile modification

Abstract

The work functions of various amorphous and crystalline transparent conducting oxides (TCO5) were measured using Kelvin probe. The films, made by pulsed laser deposition, exhibited varying work functions dependent on the composition and deposition parameters. Tin oxide showed the largest work functions of the oxides measured, while zinc oxide showed the lowest. Binary and ternary combinations of the basis TCOs showed intermediate work functions dependent on the endpoint components. Amorphous TCO5, important in OPV and other technological applications, exhibited similar work functions to their crystalline counterparts. UV/ozone treatment of TCOs temporarily increased the work function, consistent with proposed defect mechanisms associated with near-surface changes in carrier content and Fermi level. Finally, a method for facile adjustment of the work function of commercial TCOs by atomic layer deposition (ALD) capping layers was presented, illustrated by the growth of zinc oxide layers on commercial crystalline ITO films.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1355459
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Surface Science; Journal Volume: 330
Country of Publication:
United States
Language:
English

Citation Formats

Yeh, T. C., Zhu, Q., Buchholz, D. B., Martinson, A. B., Chang, R. P. H., and Mason, T. O. Amorphous transparent conducting oxides in context: Work function survey, trends, and facile modification. United States: N. p., 2015. Web. doi:10.1016/j.apsusc.2015.01.026.
Yeh, T. C., Zhu, Q., Buchholz, D. B., Martinson, A. B., Chang, R. P. H., & Mason, T. O. Amorphous transparent conducting oxides in context: Work function survey, trends, and facile modification. United States. doi:10.1016/j.apsusc.2015.01.026.
Yeh, T. C., Zhu, Q., Buchholz, D. B., Martinson, A. B., Chang, R. P. H., and Mason, T. O. Sun . "Amorphous transparent conducting oxides in context: Work function survey, trends, and facile modification". United States. doi:10.1016/j.apsusc.2015.01.026.
@article{osti_1355459,
title = {Amorphous transparent conducting oxides in context: Work function survey, trends, and facile modification},
author = {Yeh, T. C. and Zhu, Q. and Buchholz, D. B. and Martinson, A. B. and Chang, R. P. H. and Mason, T. O.},
abstractNote = {The work functions of various amorphous and crystalline transparent conducting oxides (TCO5) were measured using Kelvin probe. The films, made by pulsed laser deposition, exhibited varying work functions dependent on the composition and deposition parameters. Tin oxide showed the largest work functions of the oxides measured, while zinc oxide showed the lowest. Binary and ternary combinations of the basis TCOs showed intermediate work functions dependent on the endpoint components. Amorphous TCO5, important in OPV and other technological applications, exhibited similar work functions to their crystalline counterparts. UV/ozone treatment of TCOs temporarily increased the work function, consistent with proposed defect mechanisms associated with near-surface changes in carrier content and Fermi level. Finally, a method for facile adjustment of the work function of commercial TCOs by atomic layer deposition (ALD) capping layers was presented, illustrated by the growth of zinc oxide layers on commercial crystalline ITO films.},
doi = {10.1016/j.apsusc.2015.01.026},
journal = {Applied Surface Science},
number = ,
volume = 330,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}