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Title: Effect of Time and Deposition Method on Quality of Phosphonic Acid Modifier Self-Assembled Monolayers on Indium Zinc Oxide

Abstract

Phosphonic acid (PA) self-assembled monolayers (SAMs) are utilized at critical interfaces between transparent conductive oxides (TCO) and organic active layers in organic photovoltaic devices (OPVs). The effects of PA deposition method and time on the formation of close-packed, high-quality monolayers is investigated here for SAMs fabricated by solution deposition, micro-contact printing, and spray coating. The solution deposition isotherm for pentafluorinated benzylphosphonic acid (F5BnPA) on indium-doped zinc oxide (IZO) is studied using polarization modulation-infrared reflection-absorption spectroscopy (PM-IRRAS) at room temperature as a model PA/IZO system. Fast surface adsorption occurs within the first min; however, well-oriented high-quality SAMs are reached only after -48 h, presumably through a continual process of molecular adsorption/desorption and monolayer filling accompanied by molecular reorientation. Two other rapid, soak-free deposition techniques, micro-contact printing and spray coating, are also explored. SAM quality is compared for deposition of phenyl phosphonic acid (PPA), F13-octylphosphonic acid (F13OPA), and pentafluorinated benzyl phosphonic acid (F5BnPA) by solution deposition, micro-contact printing and spray coating using PM-IRRAS. In contrast to micro-contact printing and spray coating techniques, 48-168 h solution deposition at both room temperature and 70 degrees C result in contamination- and surface etch-free close-packed monolayers with good reproducibility. SAMs fabricated by micro-contact printing and spraymore » coating are much less well ordered.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1290792
Report Number(s):
NREL/JA-5K00-66922
Journal ID: ISSN 0169-4332
DOE Contract Number:
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Surface Science; Journal Volume: 389
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; self-assembly; phosphonic acid deposition methods; indium zinc oxide (IZO); organic photovoltaic (OPV)

Citation Formats

Sang, Lingzi, Knesting, Kristina M., Bulusu, Anuradha, Sigdel, Ajaya K., Giordano, Anthony J., Marder, Seth R., Berry, Joseph J., Graham, Samuel, Ginger, David S., and Pemberton, Jeanne E. Effect of Time and Deposition Method on Quality of Phosphonic Acid Modifier Self-Assembled Monolayers on Indium Zinc Oxide. United States: N. p., 2016. Web. doi:10.1016/j.apsusc.2016.06.183.
Sang, Lingzi, Knesting, Kristina M., Bulusu, Anuradha, Sigdel, Ajaya K., Giordano, Anthony J., Marder, Seth R., Berry, Joseph J., Graham, Samuel, Ginger, David S., & Pemberton, Jeanne E. Effect of Time and Deposition Method on Quality of Phosphonic Acid Modifier Self-Assembled Monolayers on Indium Zinc Oxide. United States. doi:10.1016/j.apsusc.2016.06.183.
Sang, Lingzi, Knesting, Kristina M., Bulusu, Anuradha, Sigdel, Ajaya K., Giordano, Anthony J., Marder, Seth R., Berry, Joseph J., Graham, Samuel, Ginger, David S., and Pemberton, Jeanne E. Thu . "Effect of Time and Deposition Method on Quality of Phosphonic Acid Modifier Self-Assembled Monolayers on Indium Zinc Oxide". United States. doi:10.1016/j.apsusc.2016.06.183.
@article{osti_1290792,
title = {Effect of Time and Deposition Method on Quality of Phosphonic Acid Modifier Self-Assembled Monolayers on Indium Zinc Oxide},
author = {Sang, Lingzi and Knesting, Kristina M. and Bulusu, Anuradha and Sigdel, Ajaya K. and Giordano, Anthony J. and Marder, Seth R. and Berry, Joseph J. and Graham, Samuel and Ginger, David S. and Pemberton, Jeanne E.},
abstractNote = {Phosphonic acid (PA) self-assembled monolayers (SAMs) are utilized at critical interfaces between transparent conductive oxides (TCO) and organic active layers in organic photovoltaic devices (OPVs). The effects of PA deposition method and time on the formation of close-packed, high-quality monolayers is investigated here for SAMs fabricated by solution deposition, micro-contact printing, and spray coating. The solution deposition isotherm for pentafluorinated benzylphosphonic acid (F5BnPA) on indium-doped zinc oxide (IZO) is studied using polarization modulation-infrared reflection-absorption spectroscopy (PM-IRRAS) at room temperature as a model PA/IZO system. Fast surface adsorption occurs within the first min; however, well-oriented high-quality SAMs are reached only after -48 h, presumably through a continual process of molecular adsorption/desorption and monolayer filling accompanied by molecular reorientation. Two other rapid, soak-free deposition techniques, micro-contact printing and spray coating, are also explored. SAM quality is compared for deposition of phenyl phosphonic acid (PPA), F13-octylphosphonic acid (F13OPA), and pentafluorinated benzyl phosphonic acid (F5BnPA) by solution deposition, micro-contact printing and spray coating using PM-IRRAS. In contrast to micro-contact printing and spray coating techniques, 48-168 h solution deposition at both room temperature and 70 degrees C result in contamination- and surface etch-free close-packed monolayers with good reproducibility. SAMs fabricated by micro-contact printing and spray coating are much less well ordered.},
doi = {10.1016/j.apsusc.2016.06.183},
journal = {Applied Surface Science},
number = ,
volume = 389,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2016},
month = {Thu Dec 15 00:00:00 EST 2016}
}