In-Situ Photoelectron Spectroscopy Study on the Air Degradation of PEDOT:PSS in Terms of Electrical and Thermoelectric Properties
- Authors
- Yun, Dong-Jin; Jung, Jaemin; Sung, Young Mo; Ra, Hyemin; Kim, Jung-Min; Chung, JaeGwan; Kim, Se Yun; Kim, Yong-Su; Heo, Sung; Kim, Ki-Hong; Jeong, Yong Jin; Jang, Jaeyoung
- Issue Date
- Nov-2020
- Publisher
- WILEY
- Keywords
- air-degradation; in situ photoelectron spectroscopy; methanol treatment; PEDOT; PSS; thermoelectrics
- Citation
- ADVANCED ELECTRONIC MATERIALS, v.6, no.11, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ELECTRONIC MATERIALS
- Volume
- 6
- Number
- 11
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/7902
- DOI
- 10.1002/aelm.202000620
- ISSN
- 2199-160X
- Abstract
- Despite excellent electrical and mechanical properties, practical application of poly(3,4-ethylenedioxythiophene) polymerized with poly(4-styrenesulfonate) (PEDOT:PSS) face the challenge of ensuring air stability in electronic industry. Here, degradation mechanism of PEDOT:PSS-based films in air is clearly demonstrated through X-ray/ultraviolet photoelectron spectroscopy (XPS/UPS) and its depth-profiling technique. As the duration of air-exposure increases, the PEDOT:PSS-based films alter molecular structures with the formation of SOx bond in PEDOT and CNx bond growth, changing ratios of insulating part (PSS−, PSSH, oxidized PEDOT) to conducting part and deteriorating their electrical conductivities. These transition behaviors are similar in all PEDOT:PSS-based films regardless of additives such as dopant or multi-walled carbon nanotube. Additionally, methanol treatment to various PEDOT:PSS-based films for inducing conformational change between PEDOT and PSS molecules, partly restore the electrical properties of the denatured PEDOT:PSS films. Finally, thermoelectric properties of the PEDOT:PSS-based films are characterized by investigating the effects of air-aging and methanol treatment on electrical conductivities, Seebeck coefficients, and power factors. To sum up, this study provides a useful guideline for establishing a strategy to ensure air stability of PEDOT:PSS-based films by clarifying the degradation mechanism and property recovery methods.
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