High Performance and Excellent Stability of All-Solid-State Electrochromic Devices Based on a Li_1.85AlO_<i>z</i> Ion Conducting Layer

Abstract

The preparation technology and limited performance of ion conducting (IC) layers are the two main obstacles for electrochromic devices (ECDs) toward commercial application. In this work, the LixAlOz films were fabricated by direct current (DC) magnetron sputtering with a Li–Al alloy target and show promising potential as an IC layer in ECDs owing to their high transparency, ultrahigh stability, and good ionic conductivity. The integrated all-solid-state ECDs, with the structure of ITO/NiOx/LixAlOz/WO3/ITO, manifest less leakage current density (<10 mA/cm2), high optical regulation (ΔT = 74.4%), excellent cyclic stability (changing less than 10% after 104 cycles), and short response time (5.7 s for coloring time, 2.2 s for bleaching time). A large-scale ECD with the area of 10 × 10 cm2 was fabricated and displayed remarkable potential as a commercial application for dynamic windows.