Electron-transfer processes in zinc phthalocyanine-phosphonic acid monolayers on ITO

Characterization of orientation and charge-transfer kinetics by waveguide spectroelectrochemistry

Hsiao Chu Lin, Nathan W. Polaske, Luis E. Oquendo, Matthew Gliboff, Kristina M. Knesting, Dennis Nordlund, David S. Ginger, Erin L Ratcliff, Brooke M. Beam, Neal R Armstrong, Dominic V Mcgrath, Steven S Saavedra

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Using a monolayer of zinc phthalocyanine (ZnPcPA) tethered to indium tin oxide (ITO) as a model for the donor/transparent conducting oxide (TCO) interface in organic photovoltaics (OPVs), we demonstrate the relationship between molecular orientation and charge-transfer rates using spectroscopic, electrochemical, and spectroelectrochemical methods. Both monomeric and aggregated forms of the phthalocyanine (Pc) are observed in ZnPcPA monolayers. Potential-modulated attenuated total reflectance (PM-ATR) measurements show that the monomeric subpopulation undergoes oxidation/reduction with k s,app = 2 × 10 2 s -1, independent of Pc orientation. For the aggregated ZnPcPA, faster orientation-dependent charge-transfer rates are observed. For in-plane-oriented Pc aggregates, k s,app = 2 × 10 3 s -1, whereas for upright Pc aggregates, k s,app = 7 × 10 2 s -1. The rates for the aggregates are comparable to those required for redox-active interlayer films at the hole-collection contact in organic solar cells.

Original languageEnglish (US)
Pages (from-to)1154-1158
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number9
DOIs
StatePublished - May 3 2012

Fingerprint

Spectroelectrochemistry
Tin oxides
Application programs
indium oxides
Indium
tin oxides
Charge transfer
Monolayers
electron transfer
Waveguides
Zinc
zinc
charge transfer
waveguides
acids
Kinetics
Acids
Electrons
kinetics
Molecular orientation

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Electron-transfer processes in zinc phthalocyanine-phosphonic acid monolayers on ITO : Characterization of orientation and charge-transfer kinetics by waveguide spectroelectrochemistry. / Lin, Hsiao Chu; Polaske, Nathan W.; Oquendo, Luis E.; Gliboff, Matthew; Knesting, Kristina M.; Nordlund, Dennis; Ginger, David S.; Ratcliff, Erin L; Beam, Brooke M.; Armstrong, Neal R; Mcgrath, Dominic V; Saavedra, Steven S.

In: Journal of Physical Chemistry Letters, Vol. 3, No. 9, 03.05.2012, p. 1154-1158.

Research output: Contribution to journalArticle

@article{a554bbea47c5436ab51175c1b53d22b3,
title = "Electron-transfer processes in zinc phthalocyanine-phosphonic acid monolayers on ITO: Characterization of orientation and charge-transfer kinetics by waveguide spectroelectrochemistry",
abstract = "Using a monolayer of zinc phthalocyanine (ZnPcPA) tethered to indium tin oxide (ITO) as a model for the donor/transparent conducting oxide (TCO) interface in organic photovoltaics (OPVs), we demonstrate the relationship between molecular orientation and charge-transfer rates using spectroscopic, electrochemical, and spectroelectrochemical methods. Both monomeric and aggregated forms of the phthalocyanine (Pc) are observed in ZnPcPA monolayers. Potential-modulated attenuated total reflectance (PM-ATR) measurements show that the monomeric subpopulation undergoes oxidation/reduction with k s,app = 2 × 10 2 s -1, independent of Pc orientation. For the aggregated ZnPcPA, faster orientation-dependent charge-transfer rates are observed. For in-plane-oriented Pc aggregates, k s,app = 2 × 10 3 s -1, whereas for upright Pc aggregates, k s,app = 7 × 10 2 s -1. The rates for the aggregates are comparable to those required for redox-active interlayer films at the hole-collection contact in organic solar cells.",
author = "Lin, {Hsiao Chu} and Polaske, {Nathan W.} and Oquendo, {Luis E.} and Matthew Gliboff and Knesting, {Kristina M.} and Dennis Nordlund and Ginger, {David S.} and Ratcliff, {Erin L} and Beam, {Brooke M.} and Armstrong, {Neal R} and Mcgrath, {Dominic V} and Saavedra, {Steven S}",
year = "2012",
month = "5",
day = "3",
doi = "10.1021/jz3002426",
language = "English (US)",
volume = "3",
pages = "1154--1158",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "9",

}

TY - JOUR

T1 - Electron-transfer processes in zinc phthalocyanine-phosphonic acid monolayers on ITO

T2 - Characterization of orientation and charge-transfer kinetics by waveguide spectroelectrochemistry

AU - Lin, Hsiao Chu

AU - Polaske, Nathan W.

AU - Oquendo, Luis E.

AU - Gliboff, Matthew

AU - Knesting, Kristina M.

AU - Nordlund, Dennis

AU - Ginger, David S.

AU - Ratcliff, Erin L

AU - Beam, Brooke M.

AU - Armstrong, Neal R

AU - Mcgrath, Dominic V

AU - Saavedra, Steven S

PY - 2012/5/3

Y1 - 2012/5/3

N2 - Using a monolayer of zinc phthalocyanine (ZnPcPA) tethered to indium tin oxide (ITO) as a model for the donor/transparent conducting oxide (TCO) interface in organic photovoltaics (OPVs), we demonstrate the relationship between molecular orientation and charge-transfer rates using spectroscopic, electrochemical, and spectroelectrochemical methods. Both monomeric and aggregated forms of the phthalocyanine (Pc) are observed in ZnPcPA monolayers. Potential-modulated attenuated total reflectance (PM-ATR) measurements show that the monomeric subpopulation undergoes oxidation/reduction with k s,app = 2 × 10 2 s -1, independent of Pc orientation. For the aggregated ZnPcPA, faster orientation-dependent charge-transfer rates are observed. For in-plane-oriented Pc aggregates, k s,app = 2 × 10 3 s -1, whereas for upright Pc aggregates, k s,app = 7 × 10 2 s -1. The rates for the aggregates are comparable to those required for redox-active interlayer films at the hole-collection contact in organic solar cells.

AB - Using a monolayer of zinc phthalocyanine (ZnPcPA) tethered to indium tin oxide (ITO) as a model for the donor/transparent conducting oxide (TCO) interface in organic photovoltaics (OPVs), we demonstrate the relationship between molecular orientation and charge-transfer rates using spectroscopic, electrochemical, and spectroelectrochemical methods. Both monomeric and aggregated forms of the phthalocyanine (Pc) are observed in ZnPcPA monolayers. Potential-modulated attenuated total reflectance (PM-ATR) measurements show that the monomeric subpopulation undergoes oxidation/reduction with k s,app = 2 × 10 2 s -1, independent of Pc orientation. For the aggregated ZnPcPA, faster orientation-dependent charge-transfer rates are observed. For in-plane-oriented Pc aggregates, k s,app = 2 × 10 3 s -1, whereas for upright Pc aggregates, k s,app = 7 × 10 2 s -1. The rates for the aggregates are comparable to those required for redox-active interlayer films at the hole-collection contact in organic solar cells.

UR - http://www.scopus.com/inward/record.url?scp=84860518911&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860518911&partnerID=8YFLogxK

U2 - 10.1021/jz3002426

DO - 10.1021/jz3002426

M3 - Article

VL - 3

SP - 1154

EP - 1158

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 9

ER -