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

doi:10.1088/1674-1056/25/2/028201

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.

Keywords: PEDOT:PSS electrochromism electrochromic devices interface

Received: 17 June 2015
Revised: 09 October 2015
Accepted manuscript online:

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

Fund:

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).

Corresponding Authors: Xue-Jin Wang
E-mail: xjwang@cau.edu.cn

Cite this article:

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) In-situ characterization of electrochromism based on ITO/PEDOT:PSS towards preparation of high performance device 2016 Chin. Phys. B 25 028201

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

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