The PEDOT:PSS (CLEVIOS™ PH500 purchased from H.C.Starck)
solution was modified with 5% DMSO, and then sonicated for 10 min before use. The first PEDOT:PSS layer was spincoated
onto the UV -ozone treated glass and annealed at 120°C for 10 min to achieve the thickness of about 30 nm. The
non-particle type silver ink for inkjet printing was supplied from Kunshan Hisense Electronics, China