Out of sight but not out of mind: the role of counter electrodes in polymer-based solid-state electrochromic devices

Throughout the literature, a variety of counter electrode materials have been used in conjugated polymer-based electrochromic devices (ECDs) without a comparative understanding of their effects on the electrochromic properties of the device. In this study, we show that poor ECD performance, often attributed to electrochromic polymer (ECP) stability, is in fact largely due to an inappropriate choice of counter electrode. We have compared a set of counter electrode materials used in the ECD literature in magenta-to-clear and black-to-clear devices and evaluated how they affect the device parameters including contrast, switching time, stability, and voltage requirements. We demonstrate that through the appropriate choice of counter electrode material (i) the operating voltage can be lowered, (ii) no additional equilibration/break-in time is required, and (iii) the contrast and switching times of the ECP is maintained when incorporated into a device. Furthermore, we show that even unencapsulated ECDs with ECP-Magenta as the vibrantly colored material assembled and operated under ambient conditions can withstand over 10 000 switches without compromising contrast or switching time.

[1]  Kuo-Chuan Ho,et al.  An all-organic solid-state electrochromic device containing poly(vinylidene fluoride-co-hexafluoropropylene), succinonitrile, and ionic liquid , 2015 .

[2]  A. L. Dyer,et al.  Process controlled performance for soluble electrochromic polymers , 2015 .

[3]  T. Mustonen,et al.  High Performance and Long-Term Stability in Ambiently Fabricated Segmented Solid-State Polymer Electrochromic Displays. , 2015, ACS applied materials & interfaces.

[4]  M. Kawamura,et al.  Accelerated coloration of electrochromic device with the counter electrode of nanoparticulate Prussian blue-type complexes , 2015 .

[5]  Long Lin,et al.  Motion-driven electrochromic reactions for self-powered smart window system. , 2015, ACS nano.

[6]  F. Krebs,et al.  Development and Manufacture of Polymer‐Based Electrochromic Devices , 2015 .

[7]  I. Han,et al.  Optically Switchable Smart Windows with Integrated Photovoltaic Devices , 2015 .

[8]  S. Zakeeruddin,et al.  A redox-flow electrochromic window. , 2015, ACS applied materials & interfaces.

[9]  Justin A. Kerszulis,et al.  An electrochromic painter's palette: color mixing via solution co-processing. , 2015, ACS applied materials & interfaces.

[10]  Justin A. Kerszulis,et al.  Four shades of brown: tuning of electrochromic polymer blends toward high-contrast eyewear. , 2015, ACS applied materials & interfaces.

[11]  Xuemei Sun,et al.  Electrochromic Fiber‐Shaped Supercapacitors , 2014, Advanced materials.

[12]  F. Krebs,et al.  From the Bottom Up – Flexible Solid State Electrochromic Devices , 2014, Advanced materials.

[13]  Eri Amasawa,et al.  Design of a New Energy‐Harvesting Electrochromic Window Based on an Organic Polymeric Dye, a Cobalt Couple, and PProDOT‐Me2 , 2014 .

[14]  Michael T. Otley,et al.  Electrochromic properties as a function of electrolyte on the performance of electrochromic devices consisting of a single-layer polymer , 2014 .

[15]  B. Kippelen,et al.  A Vertically Integrated Solar‐Powered Electrochromic Window for Energy Efficient Buildings , 2014, Advanced materials.

[16]  Justin A. Kerszulis,et al.  Mapping the broad CMY subtractive primary color gamut using a dual-active electrochromic device. , 2014, ACS applied materials & interfaces.

[17]  F. Krebs,et al.  Fast Switching ITO Free Electrochromic Devices , 2014 .

[18]  A. L. Dyer,et al.  Optimization of PEDOT films in ionic liquid supercapacitors: demonstration as a power source for polymer electrochromic devices. , 2013, ACS applied materials & interfaces.

[19]  Jun Kawahara,et al.  Printed passive matrix addressed electrochromic displays , 2013 .

[20]  G. Wallace,et al.  Colour tunable electrochromic devices based on PProDOT-(Hx)2 and PProDOT-(EtHx)2 polymers , 2013 .

[21]  J. Reynolds,et al.  Direct (Hetero)arylation Polymerization: An Effective Route to 3,4-Propylenedioxythiophene-Based Polymers with Low Residual Metal Content. , 2013, ACS macro letters.

[22]  Frederik C. Krebs,et al.  Photochemical stability of electrochromic polymers and devices , 2013 .

[23]  John R. Reynolds,et al.  Durable polyisobutylene edge sealants for organic electronics and electrochemical devices , 2012 .

[24]  David Y. Liu,et al.  A minimally coloured dioxypyrrole polymer as a counter electrode material in polymeric electrochromic window devices , 2012 .

[25]  G. Sotzing,et al.  A simple, low waste and versatile procedure to make polymer electrochromic devices , 2011 .

[26]  A. L. Dyer,et al.  Completing the color palette with spray-processable polymer electrochromics. , 2011, ACS applied materials & interfaces.

[27]  Pierre M Beaujuge,et al.  Material strategies for black-to-transmissive window-type polymer electrochromic devices. , 2011, ACS applied materials & interfaces.

[28]  David Y. Liu,et al.  Broadly Absorbing Black to Transmissive Switching Electrochromic Polymers , 2010, Advanced materials.

[29]  Evan P. Donoghue,et al.  Color purity in polymer electrochromic window devices on indium-tin oxide and single-walled carbon nanotube electrodes. , 2009, ACS applied materials & interfaces.

[30]  S. Beaupré,et al.  Multicolored Electrochromic Cells Based On Poly(2,7-Carbazole) Derivatives For Adaptive Camouflage , 2009 .

[31]  J. Reynolds,et al.  The donor-acceptor approach allows a black-to-transmissive switching polymeric electrochrome. , 2008, Nature materials.

[32]  K. Oyaizu,et al.  Totally organic polymer-based electrochromic cell using TEMPO-substituted polynorbornene as a counter electrode-active material , 2008 .

[33]  Frédéric Vidal,et al.  Self-supported semi-interpenetrating polymer networks for new design of electrochromic devices , 2008 .

[34]  M. Berggren,et al.  Printable All‐Organic Electrochromic Active‐Matrix Displays , 2007 .

[35]  D. Rosseinsky,et al.  Electrochromism and Electrochromic Devices , 2007 .

[36]  K. Oyaizu,et al.  Low-energy driven electrochromic devices using radical polymer as transparent counter electroactive material , 2007 .

[37]  Russell S. Draper,et al.  Optimization, preparation, and electrical short evaluation for 30 cm2 active area dual conjugated polymer electrochromic windows , 2007 .

[38]  Benjamin D. Reeves,et al.  Spray Coatable Electrochromic Dioxythiophene Polymers with High Coloration Efficiencies , 2004 .

[39]  M. Paoli,et al.  Solid-state electrochromic device based on two poly(thiophene) derivatives , 2004 .

[40]  Wen Lu,et al.  Fabricating Conducting Polymer Electrochromic Devices Using Ionic Liquids , 2004 .

[41]  J. Reynolds,et al.  The First Truly All‐Polymer Electrochromic Devices , 2003 .

[42]  G. Wallace,et al.  Use of Ionic Liquids for π-Conjugated Polymer Electrochemical Devices , 2002, Science.

[43]  John R. Reynolds,et al.  High Contrast Ratio and Fast-Switching Dual Polymer Electrochromic Devices , 1998 .

[44]  P. Bressers,et al.  The electrochromic behavior of indium tin oxide in propylene carbonate solutions , 1998 .

[45]  Michael T. Otley,et al.  Dependency of polyelectrolyte solvent composition on electrochromic photopic contrast , 2015 .

[46]  Toribio F. Otero,et al.  Contrast limitations of dual electrochromic systems , 2008 .

[47]  G. Casalbore-Miceli,et al.  A SOLID-STATE ELECTROCHROMIC DEVICE BASED ON TWO OPTICALLY COMPLEMENTARY CONDUCTING POLYMERS , 1998 .

[48]  Göran Gustafsson,et al.  http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-88353 Flexible active matrix addressed displays manufactured by printing and coating techniques , 2022 .