Synergistic dispersible graphene: Sulfonated carbon nanotubes integrated with PEDOT for large-scale transparent conductive electrodes

Large-scale transparent conductive electrode (TCE) based on PEDOT:PSS/G:SCNT has been successfully prepared by casting synergistic dispersible graphene:sulfonated carbon nanotubes (G:SCNT) with high concentration onto poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which possessing improved conductivity (2645 S/cm) and transmittance (∼85%), suitable work function (4.93 eV) and favorable morphology. The power conversion efficiency of the large-scale ITO-free polymer solar cell based on TCE/PTB7:PC71BM/Al has reached to 5.8%, which is higher that of the device based on indium tin oxide (ITO) electrode. Furthermore, a large-scale, flexible and robust PET/PEDOT:PSS/G:SCNT electrode fabricated by doctor-blading exists remarkable conductivity, optical transmittance, hygroscopic stability, mechanical flexibility and adhesion durability, which fancifully provides a way to replace ITO in the near future.274