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  • Neal R Armstrong
2019

Impact of Titanium Dioxide Surface Defects on the Interfacial Composition and Energetics of Evaporated Perovskite Active Layers

Shallcross, R. C., Olthof, S., Meerholz, K. & Armstrong, N. R., Sep 4 2019, In : ACS Applied Materials and Interfaces. 11, 35, p. 32500-32508 9 p.

Research output: Contribution to journalArticle

4 Scopus citations
2017

Axially Bound Ruthenium Phthalocyanine Monolayers on Indium Tin Oxide: Structure, Energetics, and Charge Transfer Properties

Ehamparam, R., Oquendo, L. E., Liao, M. W., Brynnel, A. K., Ou, K. L., Armstrong, N. R., Mcgrath, D. V. & Saavedra, S. S., Aug 30 2017, In : ACS Applied Materials and Interfaces. 9, 34, p. 29213-29223 11 p.

Research output: Contribution to journalArticle

3 Scopus citations

Critical Interface States Controlling Rectification of Ultrathin NiO-ZnO p-n Heterojunctions

Steirer, K. X., Ou, K. L., Armstrong, N. R. & Ratcliff, E. L., Sep 13 2017, In : ACS Applied Materials and Interfaces. 9, 36, p. 31111-31118 8 p.

Research output: Contribution to journalArticle

8 Scopus citations
20 Scopus citations

Liquid-crystal approaches to organic photovoltaics

Kippelen, B., Yoo, S., Haddock, J. A., Domercq, B., Barlow, S., Minch, B., Xia, W., Marder, S. R. & Armstrong, N. R., Jan 1 2017, Organic Photovoltaics: Mechanisms, Materials, and Devices. CRC Press, p. 271-298 28 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations

Spectroelectrochemistry of monolayer and submonolayer films using an electroactive integrated optical waveguide

Dunphy, D., Mendes, S., Saavedra, S. S. & Armstrong, N. R., Jan 1 2017, Interfacial Electrochemistry: Theory: Experiment, and Applications. CRC Press, p. 513-525 13 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

2016

Characterization of ZnO Interlayers for Organic Solar Cells: Correlation of Electrochemical Properties with Thin-Film Morphology and Device Performance

Ou, K. L., Ehamparam, R., Macdonald, G., Stubhan, T., Wu, X., Shallcross, R. C., Richards, R. E., Brabec, C. J., Saavedra, S. S. & Armstrong, N. R., Aug 3 2016, In : ACS Applied Materials and Interfaces. 8, 30, p. 19787-19798 12 p.

Research output: Contribution to journalArticle

10 Scopus citations

Introduction: Electronic Materials

Ratcliff, E. L., Shallcross, R. C. & Armstrong, N. R., Nov 9 2016, In : Chemical Reviews. 116, 21, p. 12821-12822 2 p.

Research output: Contribution to journalEditorial

Overcoming Electrode-Induced Losses in Organic Solar Cells by Tailoring a Quasi-Ohmic Contact to Fullerenes via Solution-Processed Alkali Hydroxide Layers

Zhang, H., Shallcross, R. C., Li, N., Stubhan, T., Hou, Y., Chen, W., Ameri, T., Turbiez, M., Armstrong, N. R. & Brabec, C. J., May 11 2016, In : Advanced Energy Materials. 6, 9, 1502195.

Research output: Contribution to journalArticle

22 Scopus citations

Phosphonic Acids for Interfacial Engineering of Transparent Conductive Oxides

Paniagua, S. A., Giordano, A. J., Smith, ON. L., Barlow, S., Li, H., Armstrong, N. R., Pemberton, J. E., Brédas, J. L., Ginger, D. & Marder, S. R., Jun 22 2016, In : Chemical Reviews. 116, 12, p. 7117-7158 42 p.

Research output: Contribution to journalReview article

73 Scopus citations

Surface modification of indium-tin oxide with functionalized perylene diimides: Characterization of orientation, electron-transfer kinetics and electronic structure

Zheng, Y., Giordano, A. J., Shallcross, R. C., Fleming, S. R., Barlow, S., Armstrong, N. R., Marder, S. R. & Saavedra, S. S., Sep 15 2016, In : Journal of Physical Chemistry C. 120, 36, p. 20040-20048 9 p.

Research output: Contribution to journalArticle

20 Scopus citations
2015

Band Edge Energetics of Heterostructured Nanorods: Photoemission Spectroscopy and Waveguide Spectroelectrochemistry of Au-Tipped CdSe Nanorod Monolayers

Ehamparam, R., Pavlopoulos, N. G., Liao, M. W., Hill, L. J., Armstrong, N. R., Pyun, D-C. & Saavedra, S. S., Sep 22 2015, In : ACS Nano. 9, 9, p. 8786-8800 15 p.

Research output: Contribution to journalArticle

16 Scopus citations

Influence of molecular orientation on charge-transfer processes at phthalocyanine/metal oxide interfaces and relationship to organic photovoltaic performance

Lin, H. C., MacDonald, G. A., Shi, Y., Polaske, N. W., Mcgrath, D. V., Marder, S. R., Armstrong, N. R., Ratcliff, E. L. & Saavedra, S. S., May 14 2015, In : Journal of Physical Chemistry C. 119, 19, p. 10304-10313 10 p.

Research output: Contribution to journalArticle

14 Scopus citations

Investigation of ultra-thin titania films as hole-blocking contacts for organic photovoltaics

Kim, H., Ou, K. L., Wu, X., Ndione, P. F., Berry, J., Lambert, Y., Mélin, T., Armstrong, N. R. & Graham, S., Jul 20 2015, In : Journal of Materials Chemistry A. 3, 33, p. 17332-17343 12 p.

Research output: Contribution to journalArticle

6 Scopus citations

Nickel oxide interlayer films from nickel formate-ethylenediamine precursor: Influence of annealing on thin film properties and photovoltaic device performance

Steirer, K. X., Richards, R. E., Sigdel, A. K., Garcia, A., Ndione, P. F., Hammond, S., Baker, D., Ratcliff, E. L., Curtis, C., Furtak, T., Ginley, D. S., Olson, D. C., Armstrong, N. R. & Berry, J. J., May 28 2015, In : Journal of Materials Chemistry A. 3, 20, p. 10949-10958 10 p.

Research output: Contribution to journalArticle

21 Scopus citations

Quantifying the extent of contact doping at the interface between high work function electrical contacts and poly(3-hexylthiophene) (P3HT)

Shallcross, R. C., Stubhan, T., Ratcliff, E. L., Kahn, A., Brabec, C. J. & Armstrong, N. R., Apr 16 2015, In : Journal of Physical Chemistry Letters. 6, 8, p. 1303-1309 7 p.

Research output: Contribution to journalArticle

25 Scopus citations

Solution Processed Titanyl Phthalocyanines as Donors in Solar Cells: Photoresponse to 1000 nm

Mayukh, M., Macech, M. R., Placencia, D., Cao, Y., Armstrong, N. R. & Mcgrath, D. V., Oct 9 2015, In : ACS Applied Materials and Interfaces. 7, 43, p. 23912-23919 8 p.

Research output: Contribution to journalArticle

12 Scopus citations
2014

Pentafluorophenoxy boron subphthalocyanine (F5BsubPc) as a multifunctional material for organic photovoltaics

Morse, G. E., Gantz, J. L., Steirer, K. X., Armstrong, N. R. & Bender, T. P., Feb 12 2014, In : ACS Applied Materials and Interfaces. 6, 3, p. 1515-1524 10 p.

Research output: Contribution to journalArticle

35 Scopus citations
2013

Critical interfaces in emerging thin film photovoltaic technologies: From basic science to policy and economic issues

Armstrong, N. R., 2013, Optics InfoBase Conference Papers.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Critical interfaces in emerging thin film photovoltaic technologies: From basic science to policy and economic issues

Armstrong, N. R., 2013, Optics InfoBase Conference Papers.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Critical interfaces in emerging thin film photovoltaic technologies: From basic science to policy and economic issues

Armstrong, N. R., 2013, Optics InfoBase Conference Papers. Optical Society of America

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Critical interfaces in emerging thin film photovoltaic technologies: From basic science to policy and economic issues

Armstrong, N. R., 2013, Optics InfoBase Conference Papers.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Critical interfaces in emerging thin film photovoltaic technologies: From basic science to policy and economic issues

Armstrong, N. R., 2013, Optics InfoBase Conference Papers. Optical Society of America

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Energy level alignment and morphology of Ag and Au nanoparticle recombination contacts in tandem planar heterojunction solar cells

Steirer, K. X., Macdonald, G. A., Olthof, S., Gantz, J., Ratcliff, E. L., Kahn, A. & Armstrong, N. R., Oct 31 2013, In : Journal of Physical Chemistry C. 117, 43, p. 22331-22340 10 p.

Research output: Contribution to journalArticle

7 Scopus citations

Influence of electrode surface composition and energetics on small-molecule organic solar cell performance: Polar versus nonpolar donors on indium tin oxide contacts

Gantz, J., Placencia, D., Giordano, A., Marder, S. R. & Armstrong, N. R., Jan 24 2013, In : Journal of Physical Chemistry C. 117, 3, p. 1205-1216 12 p.

Research output: Contribution to journalArticle

12 Scopus citations

Organic solar cells - At the interface

Zacher, B., Gantz, J. L., Richards, R. E. & Armstrong, N. R., 2013, In : Journal of Physical Chemistry Letters. 4, 11, p. 1949-1952 4 p.

Research output: Contribution to journalArticle

13 Scopus citations

Structure-processing-property correlations in solution-processed, small-molecule, organic solar cells

Wunsch, B. H., Rumi, M., Tummala, N. R., Risko, C., Kang, D. Y., Steirer, K. X., Gantz, J., Said, M., Armstrong, N. R., Brédas, J. L., Bucknall, D. & Marder, S. R., Sep 14 2013, In : Journal of Materials Chemistry C. 1, 34, p. 5250-5260 11 p.

Research output: Contribution to journalArticle

19 Scopus citations

Titanium dioxide electron-selective interlayers created by chemical vapor deposition for inverted configuration organic solar cells

Ou, K. L., Tadytin, D., Xerxes Steirer, K., Placencia, D., Nguyen, M., Lee, P. & Armstrong, N. R., Jun 21 2013, In : Journal of Materials Chemistry A. 1, 23, p. 6794-6803 10 p.

Research output: Contribution to journalArticle

23 Scopus citations
2012

Built-in potential in conjugated polymer diodes with changing anode work function: Interfacial states and deviation from the schottky-mott limit

MacLeod, B. A., Horwitz, N. E., Ratcliff, E. L., Jenkins, J. L., Armstrong, N. R., Giordano, A. J., Hotchkiss, P. J., Marder, S. R., Campbell, C. T. & Ginger, D. S., May 3 2012, In : Journal of Physical Chemistry Letters. 3, 9, p. 1202-1207 6 p.

Research output: Contribution to journalArticle

38 Scopus citations

Doping effect on chloroindium phthalocyanine (ClInPc)/C60 solar cells

Wang, W. & Armstrong, N. R., 2012, Materials Research Society Symposium Proceedings. Vol. 1390. p. 9-14 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Electrical property heterogeneity at transparent conductive oxide/organic semiconductor interfaces: Mapping contact ohmicity using conducting-tip atomic force microscopy

MacDonald, G. A., Veneman, P. A., Placencia, D. & Armstrong, N. R., Nov 27 2012, In : ACS Nano. 6, 11, p. 9623-9636 14 p.

Research output: Contribution to journalArticle

34 Scopus citations

Electron-transfer processes in zinc phthalocyanine-phosphonic acid monolayers on ITO: Characterization of orientation and charge-transfer kinetics by waveguide spectroelectrochemistry

Lin, H. C., Polaske, N. W., Oquendo, L. E., Gliboff, M., Knesting, K. M., Nordlund, D., Ginger, D. S., Ratcliff, E. L., Beam, B. M., Armstrong, N. R., Mcgrath, D. V. & Saavedra, S. S., May 3 2012, In : Journal of Physical Chemistry Letters. 3, 9, p. 1154-1158 5 p.

Research output: Contribution to journalArticle

23 Scopus citations

Energy level alignment in PCDTBT: PC 70BM solar cells: Solution processed NiO x for improved hole collection and efficiency

Ratcliff, E. L., Meyer, J., Steirer, K. X., Armstrong, N. R., Olson, D. & Kahn, A., May 2012, In : Organic Electronics: physics, materials, applications. 13, 5, p. 744-749 6 p.

Research output: Contribution to journalArticle

112 Scopus citations

Surface composition, work function, and electrochemical characteristics of gallium-doped zinc oxide

Ratcliff, E. L., Sigdel, A. K., MacEch, M. R., Nebesny, K., Lee, P. A., Ginley, D. S., Armstrong, N. R. & Berry, J. J., Jun 30 2012, In : Thin Solid Films. 520, 17, p. 5652-5663 12 p.

Research output: Contribution to journalArticle

19 Scopus citations

Surface-initiated synthesis of poly(3-methylthiophene) from indium tin oxide and its electrochemical properties

Doubina, N., Jenkins, J. L., Paniagua, S. A., Mazzio, K. A., MacDonald, G. A., Jen, A. K. Y., Armstrong, N. R., Marder, S. R. & Luscombe, C. K., Jan 24 2012, In : Langmuir. 28, 3, p. 1900-1908 9 p.

Research output: Contribution to journalArticle

46 Scopus citations

Surface intiated atom transfer radical polymerizations from indium tin oxide electrodes: Electrochemistry of polymer brushes

Kim, B. Y., Shallcross, R. C., Armstrong, N. R., Kim, H. J., Chung, W. J., Sahoo, R., Char, K., Dirlam, P. T., Costanzo, P. J. & Pyun, D-C., 2012, ACS Symposium Series. American Chemical Society, Vol. 1101. p. 197-209 13 p. (ACS Symposium Series; vol. 1101).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

The modification of indium tin oxide with phosphonic acids: Mechanism of binding, tuning of surface properties, and potential for use in organic electronic applications

Hotchkiss, P. J., Jones, S. C., Paniagua, S. A., Sharma, A., Kippelen, B., Armstrong, N. R. & Marder, S. R., Mar 20 2012, In : Accounts of Chemical Research. 45, 3, p. 337-346 10 p.

Research output: Contribution to journalArticle

179 Scopus citations

Understanding energy level alignment in PCDTBT: PC70BM solar cells

Ratcliff, E. L., Garcia, A., Cowan, S. R., Meyer, J., Steirer, K. X., Paniagua, S. A., Giordano, A., Marder, S., Armstrong, N. R., Kahn, A., Ginley, D. & Olson, D. C., 2012, Conference Record of the IEEE Photovoltaic Specialists Conference. p. 3377-3379 3 p. 6318295

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2011

Characterization of phosphonic acid binding to zinc oxide

Hotchkiss, P. J., Malicki, M., Giordano, A. J., Armstrong, N. R. & Marder, S. R., Mar 7 2011, In : Journal of Materials Chemistry. 21, 9, p. 3107-3112 6 p.

Research output: Contribution to journalArticle

75 Scopus citations

Colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles into Pt-Co3O4 nanowires

Keng, P. Y., Bull, M. M., Shim, I. B., Nebesny, K. G., Armstrong, N. R., Sung, Y., Char, K. & Pyun, D-C., Mar 8 2011, In : Chemistry of Materials. 23, 5, p. 1120-1129 10 p.

Research output: Contribution to journalArticle

42 Scopus citations

Enhanced efficiency in plastic solar cells via energy matched solution processed NiO x interlayers

Steirer, K. X., Ndione, P. F., Widjonarko, N. E., Lloyd, M. T., Meyer, J., Ratcliff, E. L., Kahn, A., Armstrong, N. R., Curtis, C. J., Ginley, D. S., Berry, J. J. & Olson, D. C., Oct 2011, In : Advanced Energy Materials. 1, 5, p. 813-820 8 p.

Research output: Contribution to journalArticle

250 Scopus citations

Evidence for near-surface NiOOH species in solution-processed NiO x selective interlayer materials: Impact on energetics and the performance of polymer bulk heterojunction photovoltaics

Ratcliff, E. L., Meyer, J., Steirer, K. X., Garcia, A., Berry, J. J., Ginley, D. S., Olson, D. C., Kahn, A. & Armstrong, N. R., Nov 22 2011, In : Chemistry of Materials. 23, 22, p. 4988-5000 13 p.

Research output: Contribution to journalArticle

203 Scopus citations

Highly photoactive titanyl phthalocyanine polymorphs as textured donor layers in organic solar cells

Placencia, D., Wang, W., Gantz, J., Jenkins, J. L. & Armstrong, N. R., Sep 29 2011, In : Journal of Physical Chemistry C. 115, 38, p. 18873-18884 12 p.

Research output: Contribution to journalArticle

46 Scopus citations

Modeling the effects of molecular length scale electrode heterogeneity in organic solar cells

Zacher, B. & Armstrong, N. R., Dec 29 2011, In : Journal of Physical Chemistry C. 115, 51, p. 25496-25507 12 p.

Research output: Contribution to journalArticle

14 Scopus citations

Phosphonic acid functionalized asymmetric phthalocyanines: Synthesis, modification of indium tin oxide, and charge transfer

Polaske, N. W., Lin, H. C., Tang, A., Mayukh, M., Oquendo, L. E., Green, J. T., Ratcliff, E. L., Armstrong, N. R., Saavedra, S. S. & Mcgrath, D. V., Dec 20 2011, In : Langmuir. 27, 24, p. 14900-14909 10 p.

Research output: Contribution to journalArticle

26 Scopus citations
42 Scopus citations

Poly(aniline) nanowires in sol-gel coated ITO: A pH-responsive substrate for planar supported lipid bilayers

Ge, C., Orosz, K. S., Armstrong, N. R. & Saavedra, S. S., Jul 27 2011, In : ACS Applied Materials and Interfaces. 3, 7, p. 2677-2685 9 p.

Research output: Contribution to journalArticle

14 Scopus citations

Selective interlayers and contacts in organic photovoltaic cells

Ratcliff, E. L., Zacher, B. & Armstrong, N. R., Jun 2 2011, In : Journal of Physical Chemistry Letters. 2, 11, p. 1337-1350 14 p.

Research output: Contribution to journalArticle

253 Scopus citations