Patent ID: 8780432

Claim:
A method for fabricating an electrochromic device, comprising: forming a primary electrochromic layer on an upper surface of a lower transparent conductor layer disposed on a substrate, wherein an upper surface of the lower transparent conductor layer has a surface roughness of greater than 50 nm and an upper surface of the primary electrochromic layer has a surface roughness of about 50 nm or less; forming an ion conductor layer on the upper surface of the primary electrochromic layer; forming a secondary electrochromic layer on an upper surface of the ion conductor layer; and forming an upper transparent conductor layer on an upper surface of the secondary electrochromic layer, wherein surface roughness is defined as an arithmetic average of absolute values of peak-to-valley heights and the primary electrohromic layer acts as a planarizing layer to reduce haze and pinholes associated with the surface roughness of the lowest transport conductor layer.