Enhanced Microstructural Uniformity in Sulfuric‐Acid‐Treated Poly(3,4‐Ethylenedioxythiophene):Poly(Styrene Sulfonate) Films Using Raman Map Analysis

Author:

Kim Hyewon1,Park Jiyeong1,Jang Jaehee2,Sasongko Nurwarrohman Andre1,Heo Jaeseong1,Lee Songyi1,Kwak Kyungwon34,Kee Seyoung2,Park Myeongkee1ORCID

Affiliation:

1. BB21 Plus Program, Department of Chemistry Pukyong National University Busan 48513 Republic of Korea

2. Department of Polymer Engineering Pukyong National University Busan 48513 Republic of Korea

3. Center for Molecular Spectroscopy and Dynamics Institute for Basic Science (IBS) Seoul 02841 Republic of Korea

4. Department of Chemistry Korea University Seoul 02841 Republic of Korea

Abstract

AbstractPoly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films have emerged as potential alternatives to indium–tin oxide as transparent electrodes in optoelectronic devices because of their superior transparency, flexibility, and chemical doping stability. However, pristine PEDOT:PSS films show low conductivities because the insulating PSS‐rich domains isolate the conductive PEDOT‐rich domains. In this study, the conductivities and corresponding spatially resolved Raman properties of PEDOT:PSS thin films treated with various concentrations of H2SO4 are presented. After the PEDOT:PSS films are treated with the H2SO4 solutions, their electrical conductivities are significantly improved from 0.5 (nontreated) to 4358 S cm−1 (100% v/v). Raman heat maps of the peak shifts and widths of the Cα═Cβ stretching mode are constructed. A blueshift and width decrease of the Cα═Cβ Raman mode in PEDOT are uniformly observed in the entire measurement area (20 × 20 µm2), indicating that microstructural transitions are successfully accomplished across the area from the coiled to linear conformation and high crystallinity upon H2SO4 treatment. Thus, it is proved that comprehensive Raman map analysis can be easily utilized to clarify microstructural properties distributed in large areas induced by various dopants. These results also offer valuable insights for evaluating and optimizing the performance of other conductive thin films.

Funder

National Research Council of Science and Technology

National Research Foundation of Korea

National Research Foundation

Publisher

Wiley

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