中国物理B ›› 2016, Vol. 25 ›› Issue (2): 28201-028201.doi: 10.1088/1674-1056/25/2/028201

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

In-situ characterization of electrochromism based on ITO/PEDOT:PSS towards preparation of high performance device

Xue-Jin Wang(王学进), Zheng-Fei Guo(郭正飞), Jing-Yu Qu(曲婧毓),Kun Pan(潘坤), Zheng Qi(祁铮), Hong Li(李泓)   

  1. 1. College of Science, China Agricultural University, 17 Qinghua Donglu, Haidian District, Beijing 100083, China;
    2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2015-06-17 修回日期:2015-10-09 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Xue-Jin Wang E-mail:xjwang@cau.edu.cn
  • 基金资助:

    Project supported by the National High Technology Research and Development Program of China (Grant No. 2015AA034201), and the Chinese Universities Scientific Fund (Grant No. 2015LX002).

In-situ characterization of electrochromism based on ITO/PEDOT:PSS towards preparation of high performance device

Xue-Jin Wang(王学进)1, Zheng-Fei Guo(郭正飞)1, Jing-Yu Qu(曲婧毓)1,Kun Pan(潘坤)1, Zheng Qi(祁铮)1, Hong Li(李泓)2   

  1. 1. College of Science, China Agricultural University, 17 Qinghua Donglu, Haidian District, Beijing 100083, China;
    2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-06-17 Revised:2015-10-09 Online:2016-02-05 Published:2016-02-05
  • Contact: Xue-Jin Wang E-mail:xjwang@cau.edu.cn
  • Supported by:

    Project supported by the National High Technology Research and Development Program of China (Grant No. 2015AA034201), and the Chinese Universities Scientific Fund (Grant No. 2015LX002).

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摘要：

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is usually sandwiched between indium tin oxide (ITO) and a functional polymer in order to improve the performance of the device. However, because of the strong acidic nature of PEDOT:PSS, the instability of ITO/PEDOT:PSS interface is also observed. The mechanism of degradation of the device remains is unclear and needs to be further studied. In this article, we investigate the in-situ electrochromism of PEDOT:PSS to disclose the cause of the degradation. X-ray photoelectron spectroscopy (XPS) was used to characterize the PEDOT:PSS films, as well as the PEDOT:PSS plus polyethylene glycol (PEG) films with and without indium ions. The electrochromic devices (ECD) based on PEDOT:PSS and PEG with and without indium ions are carried out by in-situ micro-Raman and laser reflective measurement (LRM). For comparison, ECD based on PEDOT:PSS and PEG films with LiCl, KCl, NaCl or InCl3 are also investigated by LRM. The results show that PEDOT:PSS is further reduced when negatively biased, and oxidized when positively biased. This could identify that PEDOT:PSS with indium ions from PEDOT:PSS etching ITO will lose dopants when negatively biased. The LRM shows that the device with indium ions has a stronger effect on the reduction property of PEDOT:PSS-PEG film than the device without indium ions. The contrast of the former device is 44%, that of the latter device is about 3%. The LRM also shows that the contrasts of the device based on PEDOT:PSS+PEG with LiCl, KCl, NaCl, InCl3 are 30%, 27%, 15%, and 18%, respectively.

关键词: PEDOT:PSS, electrochromism, electrochromic devices, interface

Abstract:

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is usually sandwiched between indium tin oxide (ITO) and a functional polymer in order to improve the performance of the device. However, because of the strong acidic nature of PEDOT:PSS, the instability of ITO/PEDOT:PSS interface is also observed. The mechanism of degradation of the device remains is unclear and needs to be further studied. In this article, we investigate the in-situ electrochromism of PEDOT:PSS to disclose the cause of the degradation. X-ray photoelectron spectroscopy (XPS) was used to characterize the PEDOT:PSS films, as well as the PEDOT:PSS plus polyethylene glycol (PEG) films with and without indium ions. The electrochromic devices (ECD) based on PEDOT:PSS and PEG with and without indium ions are carried out by in-situ micro-Raman and laser reflective measurement (LRM). For comparison, ECD based on PEDOT:PSS and PEG films with LiCl, KCl, NaCl or InCl3 are also investigated by LRM. The results show that PEDOT:PSS is further reduced when negatively biased, and oxidized when positively biased. This could identify that PEDOT:PSS with indium ions from PEDOT:PSS etching ITO will lose dopants when negatively biased. The LRM shows that the device with indium ions has a stronger effect on the reduction property of PEDOT:PSS-PEG film than the device without indium ions. The contrast of the former device is 44%, that of the latter device is about 3%. The LRM also shows that the contrasts of the device based on PEDOT:PSS+PEG with LiCl, KCl, NaCl, InCl3 are 30%, 27%, 15%, and 18%, respectively.

Key words: PEDOT:PSS, electrochromism, electrochromic devices, interface

中图分类号:  (Conducting polymers)

  • 82.35.Cd
82.47.Tp (Electrochemical displays) 82.47.Jk (Photoelectrochemical cells, photoelectrochromic and other hybrid electrochemical energy storage devices) 79.60.Jv (Interfaces; heterostructures; nanostructures)