Fig. 2(a). shows the top view SEM image of all solution processed polymer/metal hybrid electrodes with inkjet printed
Ag grids. Through process control, a relatively smooth surface profile was achieved for the printed Ag lines with width
of about 80 f.!m, and height of about 40 nm, and the second PEDOT:PSS layer can thus be easily deposited. The smooth
surface profile is also important to prevent the devices from forming high local electric field for yield and reliability
issues.