Highoptical transmittance conjugated-polymers with electrical conductivity are garnering much attention for the applications in organic optoelectronic devices including organic field-effect-transistors and solar cells. Polymers based on PEDOT are particularly promising candidates with high conductivity, uniform surface planarity and excellent ductility. In this work, homopolymer PEDOT deposited using oxidative chemical-vapor-deposition(oCVD) show the maximum conductivity of approximate to 3500 S/cm. However, their utility is limited due to the relatively low transmittance and abrupt decrease near the red edge in the visible regime. Here, the significantly improved optical properties achieved via tuning the bandgap of cross-linked PEDOT copolymers using oCVD, offering a single-step process for the synthesis and deposition of copolymer films, is reported. The cross-linking monomers of biphenyl or anthracene are simultaneously evaporated with EDOT monomer and an oxidant(FeCl3) during the deposition. Poly(anthracene-co-EDOT)[p(ANTH-co-EDOT)] shows the superior transmittance (approximate to 93%) to homopolymer PEDOT (approximate to 80%) and poly(biphenyl-co-EDOT)[p(BPH-co-EDOT)] (approximate to 88%). Additionally, copolymers show no transmission decay in the red edge regime unlike homopolymer PEDOT that presents an abrupt transmission falloff. An improvement in optical transmittance is in agreement with an increase in bandgap of materials (p(ANTH-co-EDOT), approximate to 2.3eV vs PEDOT, approximate to 1.8 eV). oCVD-processed bandgap-tunable PEDOT copolymers with enhanced transmittance may, therefore, have applications in organic optoelectronic devices that require high optical transparency.