Journal of Polymer Research

, 25:236 | Cite as

A focus on polystyrene tacticity in synthesized conductive PEDOT:PSS thin films

  • Sara Ebrahimi
  • Morteza Nasiri
  • Samira Agbolaghi
  • Farhang AbbasiEmail author
  • Raana Sarvari


Poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) is a transparent conductive material and a good candidate for being employed as substitute for indium tin oxide (ITO) in reducing the production costs of organic solar cells. To enhance the performance of organic devices, an improving in the conductivity of PEDOT:PSS is crucial and using the solvent additive rises the electrical conductivity by the optimization of the film morphology. The studies have only focused on the relationship between the electrical conductivity of thin films and the crystallinity of PEDOT, and it is also found that the high conductivity is observed in the highly crystalline samples. This study focused on the effect of tacticity of PS on the conductivity of PEDOT:PSS films. First, atactic and isotactic polystyrenes were sulfonated and the complexes of PEDOT:PSS were synthesized. The N-methylpyrrolidone (NMP), as a secondary dopant, was then added to the complexes and conductivity enhancement was investigated in various annealing times. The obtained films were characterized by atomic force microscopy, X-ray diffraction, four point probe resistivity measurement system, UV–visible spectroscopy, FT-IR, and cyclic voltammetry. The electrical conductivity of PEDOT:iPSS films synthesized by the isotactic polystyrene was ~ 0.68 S/cm and by adding 5 wt% NMP into PEDOT:PSS solution, the conductivity of the annealed thin layers increased more than 10-folds (~ 7.73 S/cm) at an appropriate temperature.


PEDOT:PSS complex Thin film Conductivity Isotactic/atactic polystyrene 


  1. 1.
    Xiao Y, Cui X, Hancock JM, Bouguettaya M, Reynolds JR, Martin DC (2004) Electrochemical polymerization of poly(hydroxymethylated-3,4-ethylenedioxythiophene) (PEDOT-MeOH) on multichannel neural probes. Sens Actuators B Chem 99:437–443CrossRefGoogle Scholar
  2. 2.
    Yeo JS, Yun JM, Kim DY, Kim SS, Na SI (2013) Successive solvent-treated PEDOT:PSS electrodes for flexible ITO-free organic photovoltaics. Sol. Energ. Mat. Sol. Cells 114:104–109CrossRefGoogle Scholar
  3. 3.
    Weber M (2009) Terahertz transmission spectroscopy of the organic polymer: PEDOT: PSS. Freie Universität Berlin, DissGoogle Scholar
  4. 4.
    Winther-Jensen B, Breiby DW, West K (2005) Base inhibited oxidative polymerization of 3,4-ethylenedioxythiophene with iron(III)tosylate. Synth Met 152:1–4CrossRefGoogle Scholar
  5. 5.
    Groenendaal L, Jonas F, Freitag D, Pielartzik H, Reynolds JR (2000) Poly(3,4-ethylenedioxythiophene) and Its Derivatives: Past, Present, and Future. Adv Mater 12:481–494CrossRefGoogle Scholar
  6. 6.
    Bian L, Zhu E, Tang J, Tang W, Zhang F (2012) Recent progress in the design of narrow bandgap conjugated polymers for high-efficiency organic solar cells. Prog Polym Sci 37:1292–1331CrossRefGoogle Scholar
  7. 7.
    Tait JG, Worfolk BJ, Maloney SA, Hauger TC, Elias AL, Buriak JM, Harris KD (2013) Spray coated high-conductivity PEDOT:PSS transparent electrodes for stretchable and mechanically-robust organic solar cells. Sol Energ Mat Sol Cells 110:98–106CrossRefGoogle Scholar
  8. 8.
    Noh YJ, Kim SS, Kim TW, Na SI (2014) Cost-effective ITO-free organic solar cells with silver nanowire–PEDOT:PSS composite electrodes via a one-step spray deposition method. Sol. Energ. Mat. Sol. Cells 120:226–230CrossRefGoogle Scholar
  9. 9.
    Lim K, Jung S, Kim JK, Kang JW, Kim JH, Choa SH, Kim DG (2013) Flexible PEDOT: PSS/ITO hybrid transparent conducting electrode for organic photovoltaics. Sol. Energ. Mat. Sol. Cells 115:71–78CrossRefGoogle Scholar
  10. 10.
    Kim YH, Sachse C, Machala ML, May C, Müller-Meskamp L, Leo K (2011) Highly Conductive PEDOT:PSS Electrode with Optimized Solvent and Thermal Post-Treatment for ITO-Free Organic Solar Cells. Adv Func Mater 21:1076–1081CrossRefGoogle Scholar
  11. 11.
    Jordan CA (2015) Work function modification of metal electrodes via printing of PEDOT:PSS and carbon nanotubes. Wright State University, DissGoogle Scholar
  12. 12.
    Zhang Y, Cui W, Zhu Y, Zu F, Liao L, Lee ST, Sun B (2015) High efficiency hybrid PEDOT:PSS/nanostructured silicon Schottky junction solar cells by doping-free rear contact. Energy Environ Sci 8:297–302CrossRefGoogle Scholar
  13. 13.
    Palumbiny CM, Liu F, Russell TP, Hexemer A, Wang C, Müller-Buschbaum P (2015) The Crystallization of PEDOT:PSS Polymeric Electrodes Probed In Situ during Printing. Adv Mater 27:3391–3397CrossRefGoogle Scholar
  14. 14.
    Gkoupidenis P, Schaefer N, Garlan B, Malliaras GG (2015) Neuromorphic Functions in PEDOT:PSS Organic Electrochemical Transistors. Adv Mater 27:7176–7180CrossRefGoogle Scholar
  15. 15.
    Agbolaghi S, Abbasi F, Gheybi H (2016) High efficient and stabilized photovoltaics via morphology manipulating in active layer by rod-coil block copolymers comprising different hydrophilic to hydrophobic dielectric blocks. Eur Polym J 84:465–480CrossRefGoogle Scholar
  16. 16.
    S. Agbolaghi, M. Nazari, S. Zenoozi, F. Abbasi, J. Mater. Sci.: Mater. Electron. 2017, Google Scholar
  17. 17.
    Agbolaghi S, Abbasi F, Zenoozi S, Nazari M (2017) Annealing-free multi-thermal techniques comprising aging, cycling and seeding to enhance performance of thick P3HT:PCBM photovoltaic cells via developing hairy crystals. Mater Sci Semicond Process 63:285–294CrossRefGoogle Scholar
  18. 18.
    Skotheim TA, Reynolds J (2006) Conjugated polymers: theory, synthesis, properties, and characterization. CRC pressGoogle Scholar
  19. 19.
    Salzner U, Lagowski JB, Pickup PG, Poirier RA (1998) Comparison of geometries and electronic structures of polyacetylene, polyborole, polycyclopentadiene, polypyrrole, polyfuran, polysilole, polyphosphole, polythiophene, polyselenophene and polytellurophene. Synth Met 96:177–189CrossRefGoogle Scholar
  20. 20.
    Chochos CL, Choulis SA (2011) How the structural deviations on the backbone of conjugated polymers influence their optoelectronic properties and photovoltaic performance. Prog Poly Sci 36:1326–1414CrossRefGoogle Scholar
  21. 21.
    Yeo JS, Yun JM, Kim DY, Park S, Kim SS, Yoon MH, Kim TW, Na SI (2012) Significant Vertical Phase Separation in Solvent-Vapor-Annealed Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate) Composite Films Leading to Better Conductivity and Work Function for High-Performance Indium Tin Oxide-Free Optoelectronics. ACS Appl Mater Interfaces 4:2551–2560CrossRefGoogle Scholar
  22. 22.
    Cruz-Cruz I, Reyes-Reyes M, Aguilar-Frutis MA, Rodriguez AG, López-Sandoval R (2010) Study of the effect of DMSO concentration on the thickness of the PSS insulating barrier in PEDOT:PSS thin films. Synth Met 160:1501–1506CrossRefGoogle Scholar
  23. 23.
    Wei Q, Mukaida M, Naitoh Y, Ishida T (2013) Morphological Change and Mobility Enhancement in PEDOT:PSS by Adding Co-solvents. Adv Mater 25:2831–2836CrossRefGoogle Scholar
  24. 24.
    Zhang W, Bi X, Zhao X, Zhao Z, Zhu J, Dai S, Lu Y, Yang S (2014) Isopropanol-treated PEDOT:PSS as electron transport layer in polymer solar cells. Org Electron 15:3445–3451CrossRefGoogle Scholar
  25. 25.
    Khodakarimi S, Hekhmatshoar MH, Nasiri M, Khaleghi-Moghaddam M, Abbasi F, Mater J (2016). Sci: Mater Electron 27:1278–1285Google Scholar
  26. 26.
    Keawprajak A, Koetniyom W, Piyakulawat P, Jiramitmongkon K, Pratontep S, Asawapirom U (2013) Effects of tetramethylene sulfone solvent additives on conductivity of PEDOT:PSS film and performance of polymer photovoltaic cells. Org Electron 14:402–410CrossRefGoogle Scholar
  27. 27.
    Wang Z, Xu J, Yao Y, Zhang L, Wen Y, Song H, Zhu D (2014) Facile preparation of highly water-stable and flexible PEDOT:PSS organic/inorganic composite materials and their application in electrochemical sensors. Sens. Actuators B Chem. 196:357–369CrossRefGoogle Scholar
  28. 28.
    Tsai TC, Chang HC, Chen CH, Huang YC, Whang WT (2014) A facile dedoping approach for effectively tuning thermoelectricity and acidity of PEDOT:PSS films. Org Electron 15:641–645CrossRefGoogle Scholar
  29. 29.
    Yamamoto NA, Lima LF, Perdomo RE, Valaski R, Calil VL, Macedo AG, Cremona M, Roman LS (2013) Modification of PEDOT:PSS anode buffer layer with HFA for flexible polymer solar cells. Chem Phys Lett 572:73–77CrossRefGoogle Scholar
  30. 30.
    Ouyang J (2013) “Secondary doping” methods to significantly enhance the conductivity of PEDOT:PSS for its application as transparent electrode of optoelectronic devices. Displays 34:423–436CrossRefGoogle Scholar
  31. 31.
    Park S, Tark SJ, Kim D (2011) Effect of sorbitol doping in PEDOT:PSS on the electrical performance of organic photovoltaic devices. Curr Appl Phys 11:1299–1301CrossRefGoogle Scholar
  32. 32.
    Huang CJ, Chen KL, Tsao YJ, Chou DW, Chen WR, Meen TH (2013) Study of solvent-doped PEDOT: PSS layer on small molecule organic solar cells. Synth Met 164:38–41CrossRefGoogle Scholar
  33. 33.
    Nardes AM, Janssen RA, Kemerink M (2008) A Morphological Model for the Solvent-Enhanced Conductivity of PEDOT:PSS Thin Films. Adv. Func. Mater. 18:865–871CrossRefGoogle Scholar
  34. 34.
    Brédas JL, Chem J (1985). Phys 82:3808–3811Google Scholar
  35. 35.
    A.M. Nardes, On the conductivity of PEDOT: PSS thin films. Technische Universiteit Eindhoven. Eindhoven 132 (2007)Google Scholar
  36. 36.
    Elschner A, Kirchmeyer S, Lövenich W, Merker U (2011) K. Reuter. PEDOT principles and applications of an intrinsically conductive polymerGoogle Scholar
  37. 37.
    Dekker M (1998) Head-to-tail coupled poly(3-alkylthiophene) and its derivatives. Handbook of conducting polymers, New YorkGoogle Scholar
  38. 38.
    Takano T, Masunaga H, Fujiwara A, Okuzaki H, Sasaki T (2012) PEDOT Nanocrystal in Highly Conductive PEDOT:PSS Polymer Films. Macromolecules 45:3859–3865CrossRefGoogle Scholar
  39. 39.
    Vink H (1981). Macromol Chem Phys 182:279–281CrossRefGoogle Scholar
  40. 40.
    F. Kucera, Homogeneous and heterogeneous sulfonation of polystyrene, PhD Thesis, BRNO Univer of Technology (2001)Google Scholar
  41. 41.
    Pavia DL, Lampman GM, Kriz GS, Vyvyan JA (2008) Introduction to spectroscopy. Cengage LearningGoogle Scholar
  42. 42.
    Lim K, Jung S, Lee S, Heo J, Park J, Kang JW, Kang YC, Kim DG (2014) The enhancement of electrical and optical properties of PEDOT:PSS using one-step dynamic etching for flexible application. Org Electron 15:1849–1855CrossRefGoogle Scholar
  43. 43.
    Nabid MR, Rezaei SJT, Hosseini SZ (2012) A novel template-free route to synthesis of poly(3,4-ethylenedioxythiophene) with fiber and sphere-like morphologies. Mater Lett 84:128–131CrossRefGoogle Scholar
  44. 44.
    Horii T, Li Y, Mori Y, Okuzaki H (2015) Correlation between the hierarchical structure and electrical conductivity of PEDOT/PSS. Polym J 47:695–699CrossRefGoogle Scholar
  45. 45.
    Kim Y, Ballantyne AM, Nelson J, Bradley DD (2009) Effects of thickness and thermal annealing of the PEDOT:PSS layer on the performance of polymer solar cells. Org Electron 10:205–209CrossRefGoogle Scholar
  46. 46.
    Wu J (2011) Morphology of poly(3,4-ethylene dioxythiophene) (PEDOT) thin films, crystals, cubic phases, fibers and tubes. University of Michigan, PhD dissGoogle Scholar
  47. 47.
    Yue G, Wu J, Xiao Y, Lin J, Huang M, Lan Z, Phys J (2012). Chem C 116:18057–18063Google Scholar
  48. 48.
    Swinehart D (1962) The Beer-Lambert Law. J Chem Educ 39:333CrossRefGoogle Scholar
  49. 49.
    Xia Y, Ouyang J, Mater J (2011). Chem 21:4927–4936Google Scholar

Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Sara Ebrahimi
    • 1
  • Morteza Nasiri
    • 1
  • Samira Agbolaghi
    • 2
  • Farhang Abbasi
    • 1
    Email author
  • Raana Sarvari
    • 3
  1. 1.Faculty of Polymer Engineering and Institute of Polymeric MaterialsSahand University of TechnologyTabrizIran
  2. 2.Chemical Engineering Department, Faculty of EngineeringAzarbaijan Shahid Madani UniversityTabrizIran
  3. 3.Department of ChemistryPayame Noor UniversityTehranIslamic Republic of Iran

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