Exploring the electrochromic properties of poly(thieno[3,2-b]thiophene)s decorated with electron-deficient side groups

Abstract

Electron-deficient cyanophenyl side groups decrease the response time and drastically improve the stability of electrochromic polymers.

Thieno[3,2‐b]Thiophene End‐Capped all‐Sulfur Analog of 3,4‐Ethylenedioxythiophene and its Eletrosynthesized Polymer: Is Distorted Conformation Not Suitable for Electrochromism?

“…In 2016, Meng and coworkers reported a series of outstanding TT‐based electrochromic polymers and studied the effects of different attachments at 3,6‐positions of TT moiety (alkyl chain, 3,4‐ethylenedioxythiophene (EDOT), cyanophenyl, etc.) on their optoelectric properties . Similar positive effects of planar π‐conjugated structures on the electrochromic behavior of EDOT‐based conducting polymers including P(furan–EDOT), P(selenophene–EDOT), P(thiadiazolo[3,4‐ c ]pyridine–EDOT) and P(isoindigo–EDOT) have been also demonstrated by our previous reports .…”

Design Strategy for Efficient Solution-Processable Red Electrochromic Polymers Based on Unconventional 3,6-Bis(dodecyloxy)thieno[3,2-b]thiophene Building Blocks

“…Figure b and Figure S7b). Yet, compared to the plots of i p vs v 1/2 (diffusion-controlled redox process), better linear dependences ( R 2 > 0.997) were found for i p vs v , corresponding to non-diffusion-controlled redox process and indicating that the electroactive film has been stably adhered onto the electrode surface. , …”

“…Yet, compared to the plots of i p vs v 1/2 (diffusioncontrolled redox process), better linear dependences (R 2 > 0.997) were found for i p vs v, corresponding to non-diffusioncontrolled redox process and indicating that the electroactive film has been stably adhered onto the electrode surface. 33,46 To test the long-term stability of the polymer films, squarewave voltammetry (SWV) experiments were performed by switching the doping/dedoping potentials for over 12000 times. The transported charges during the oxidation and reduction per unit area and the retained percentage of the total charge compared to its initial value as a function of the number of cycles are shown in Figure 4c.…”

“…It has been widely exploited in the design of materials for active layers in organic thin film transistors (OTFTs), − organic photovoltaics (OPVs), , and thermoelectric materials − owing to the low band gaps of its polymers with electron-rich rigid conjugation structures . Recently, various TT-based ECPs have been investigated by our research group. − The electrochromic devices based on these materials exhibited multiple colors, high optical contrast, short switching time, and stable cycling life indicating the potential of TT building blocks for design of novel electrochromic materials. Among all the TT-based electrochromic polymers we have investigated, 3,6-bis­(alkoxy)­thieno­[3,2- b ]­thiophenes (BOTTs) have been regarded as capable building blocks for comparable performances .…”

Synthesis of Water-Soluble Spiropyran-Modified Poly(acrylic acid) Micelles and Their Optical Behaviors

“…In recent years, the stimuli-responsive polymer materials are of great interest for their wide range of applications [1][2][3][4][5]. Among various physical and chemical stimuli, light stimulus has attracted more attention due to its minimal impact on both surroundings and material [6][7][8][9][10].…”