Enhanced Durability of an All-Solid-State WO<sub>3</sub> Based Electrochromic Device on a Single Substrate by Using a Complementary Anodically Coloring Poly(<i>o</i>-ethoxyaniline)
Vitantonio Primiceri, Marco Pugliese, Roberto Giannuzzi, Marco Esposito, Giuseppe Gigli, Vincenzo Maiorano, Pierluigi Cossari
Abstract
High Resolution Image Download MS PowerPoint Slide Electrochromic (EC) devices represent one of the most promising energy-saving and solar control technologies for the market of energy-efficient building and optoelectronic devices by offering dynamic control of the optical transmission of visible and near-infrared light. Although notable results are achieved in terms of material and EC performance, a continuous and intense effort is currently devoted to the development of effective solid-state systems capable of providing excellent durability. Here, poly( o -ethoxyaniline) (POEA), a derivative of PANI capable of being more easily processed by solution deposition techniques than PANI, is used as both anodic EC and protective layer to fabricate a complementary all-solid-state WO 3 /POEA based EC device on a single-glass substrate. The introduction of POEA, synthesized by chemical oxidative polymerization, enabled a more marked protection against the degradative processes occurring at the anode side, promoting at the same time a more effective conversion between the different WO 3 redox states, fast switching dynamics, and a high coloration efficiency (η = 150 cm 2 C – 1 ). Besides determining a significant gain in EC performance, POEA permits us to maintain a good optical response and electrochemical stability after 1000 CV cycles, conferring an enhanced durability with respect to similar monolithic all-solid-state WO 3 based EC devices.