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

摘要

A high concentration graphene (G) dispersion assisted by sulfonated carbon nanotube (SCNT) has been successfully prepared. SCNT may play an important role in not only suppressing the agglomeration of graphene, but also bridging graphene sheets to improve the interlamellar conductivity. The interconnected network conductive G:SCNT coating on poly(3,4-ethylenediox ythiophene):poly(styrenesulfonate) (PEDOT:PSS) can keep outstanding film-forming property as well as improve markedly the conductivity. PEDOT:PSS/G:SCNT possessing improved conductivity (2645 S cm(-1)) and transmittance (similar to 85%), suitable work function (4.93 eV) and favorable morphology can not only replace indium tin oxide (ITO) as TCE to realize device (Glass/PEDOT:PSS/G:SCNT/PTB7:PC71BM/Al) efficiency achieving 5.8% with an effective area of 15 mm(2), but also simplify the device structure (TCE/active layer/metal electrode). Furthermore, a large-scale, flexible and robust PET/PEDOT:PSS/G:SCNT electrode has been fabricated by doctor-blading technique. Apart from preferable transmittance and conductivity comparable to commercial PET/ITO, PET/PEDOT:PSS/G:SCNT exhibits excellent mechanical flexibility and durability under bending 500 cycles, which is superior to that of PET/ITO. Therefore, the approach to novel conductive carbon electrode provides a reliable royal road for realizing the commercial production of large-scale TCE to replace ITO. (C) 2015 Elsevier Ltd. All rights reserved.