Abstract: A method of forming an electrochromic (EC) device includes forming a solid-state first electrolyte layer, after forming the solid-state first electrolyte layer, laminating the first solid-state first electrolyte layer between a transparent first substrate and a transparent second substrate such that a transparent first electrode is disposed between the first substrate and a first side of the solid-state first electrolyte layer, and a transparent second electrode is disposed between the second substrate and a second side of the solid-state first electrolyte layer, and applying a sealant to seal the solid-state first electrolyte layer between the first and second substrates and to form the EC device.