The Electro-optical Properties and Optimization of a PEDOT-PMeT All-thiophene Electrochromic Device
Date Issued
2005
Date
2005
Author(s)
Huang, Shih-Wen
DOI
zh-TW
Abstract
A novel all-thiophene ECD with a color change from light red to deep blue was presented. For PEDOT and PMeT thin film properties, not only the basic electrochromic performances and stabilities but also the ion transfer phenomena cycled in lithium perchlorate organic electrolyte were studied upon different of cyclic voltammetric and potential step methods. Based on the understandings of PEDOT and PMeT thin films, the optimization of the PEDOT-PMeT ECD was searched by varying the charge capacity ratio at first, and then by exploring the long-term stabilities with different bleaching and darkening potentials. Finally, the optimized potentials were obtained: 0.5 V for bleaching and -1.3 V for darkening. The transmittance change was 40 % at 655 nm, and after 30,000 potential step cycles, the transmittance change still remained 22 %. In literature, studies were either rare about the potential distributions on each electrode within an ECD or the reported data were not reliable. In this thesis, a method reversibly measure the potential distributions of PEDOT and PMeT within the ECD by a bipotentiostat was established, and it can help us to observe the real state of each thin film, thus to improve the performances of the ECD. The potential distributions of PEDOT and PMeT within the ECDs with different charge capacity ratios were recorded by this method and the operating windows of each thin film within the ECDs were obtained, which was in good agreement with the theoretical prediction. Finally, in order to improve the liquid electrolytes’ leakage problem and for safety concern, the PVDF-HFP was added to the ordinary liquid electrolyte as a polymer matrix.
Subjects
電致色變元件
EQCM
poly(3,4-ethylenedioxythiophenes)(PEDOT)
聚三甲基塞吩
電位分布
Electrochromic device (ECD)
poly(3,4-ethylenedioxythiophenes) (PEDOT)
poly(3-methylthiophene) (PMeT)
potential distribution
Type
thesis
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