Seal for electrochromic device

An electrochromic article comprising:

• a first substrate having a first surface and an opposite second surface;
• a second substrate having a third surface and an opposite fourth surface separated from the first substrate with the second surface of the first substrate facing the third surface of the second substrate;
• a first electrode positioned over at least a portion of the second surface of the first substrate;
• a second electrode positioned over at least a portion of the third surface of the second substrate where the first electrode is separated from the second electrode;
• a sealant material positioned between the first electrode and second electrode;
• an electrochromic composition positioned in direct contact with at least a portion of the first electrode and at least a portion of the second electrode;
• wherein the sealant material is formed from an organic polymer material having an oxygen transmission rate (OTR) of less than or equal to 2 cubic centimeters per square meter day atmosphere (cc/m2·day·atm),
• wherein the electrochromic article further comprises an interlayer material in direct contact with, a portion of the opposite second surface of the first substrate, a portion of a second surface of the first electrode, at least a portion of the sealant material, a portion of a first surface of the second electrode, and a portion of the third surface of the second substrate, wherein the second surface of the first electrode and the first surface of the second electrode are in facing separated opposition to each other,
• wherein the interlayer material comprises polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or polyisobutylene (PIB), and
• wherein the sealant material overlaps the electrochromic composition in a step orientation, wherein a portion of the sealant material is interposed between a portion of a second surface of the first electrode and a portion of the electrochromic composition, and a portion of the sealant material extends over a portion of the first surface of the second electrode.