title: High-performance organic complementary inverters using monolayer graphene electrodes.
abstract: Chemical vapor deposition-grown graphene has been an attractive electrode material for organic electronic devices, such as organic field-effect transistors (OFETs), because it is highly conductive and provides good oxidation and thermal stability properties. However, it still remains a challenge to demonstrate organic complementary circuits using graphene electrodes because of the relatively poor performance of n-type OFETs. Here, we report the development of high-performance organic complementary inverters using graphene as source/drain electrodes and N, N'-ditridecyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C13) and pentacene as n- and p-type organic semiconductors, respectively. Graphene electrodes were n-doped via the formation of NH2-terminated self-assembled monolayers that lowered the work function and the electron injection barrier between the graphene and PTCDI-C13. Thermal annealing improved the molecular packing among PTCDI-C13 groups on the graphene surface, thereby increasing the crystallinity and grain size. The thermally annealed PTCDI-C13 OFETs prepared using n-doped graphene electrodes exhibited a good field-effect mobility of up to 0.43 cm2/(V s), which was comparable to the values obtained from other p-type pentacene OFETs. By integrating p- and n-type OFETs, we successfully fabricated organic complementary inverters that exhibited highly symmetric operation with an excellent voltage gain of up to 124 and good noise margin.
authors.affiliation: Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
authors.forename: Yong Jin
authors.initials: YJ
authors.lastname: Jeong
authors.forename: Jaeyoung
authors.initials: J
authors.lastname: Jang
authors.forename: Sooji
authors.initials: S
authors.lastname: Nam
authors.forename: Kyunghun
authors.initials: K
authors.lastname: Kim
authors.forename: Lae Ho
authors.initials: LH
authors.lastname: Kim
authors.forename: Seonuk
authors.initials: S
authors.lastname: Park
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: An
authors.forename: Chan Eon
authors.initials: CE
authors.lastname: Park