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ACS Nano. 2017 Jun 27;11(6):6319-6327. doi: 10.1021/acsnano.7b02635. Epub 2017 Jun 13.

Light-Triggered Ternary Device and Inverter Based on Heterojunction of van der Waals Materials.

Shim J1,2, Jo SH1,2, Kim M1,2, Song YJ1,2, Kim J1,2, Park JH1,2.

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School of Electronic and Electrical Engineering and §SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University , Suwon 440-746, Korea.
Department of Mechanical Engineering and ∥Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.


Multivalued logic (MVL) devices/circuits have received considerable attention because the binary logic used in current Si complementary metal-oxide-semiconductor (CMOS) technology cannot handle the predicted information throughputs and energy demands of the future. To realize MVL, the conventional transistor platform needs to be redesigned to have two or more distinctive threshold voltages (VTHs). Here, we report a finding: the photoinduced drain current in graphene/WSe2 heterojunction transistors unusually decreases with increasing gate voltage under illumination, which we refer to as the light-induced negative differential transconductance (L-NDT) phenomenon. We also prove that such L-NDT phenomenon in specific bias ranges originates from a variable potential barrier at a graphene/WSe2 junction due to a gate-controllable graphene electrode. This finding allows us to conceive graphene/WSe2-based MVL logic circuits by using the ID-VG characteristics with two distinctive VTHs. Based on this finding, we further demonstrate a light-triggered ternary inverter circuit with three stable logical states (ΔVout of each state <0.05 V). Our study offers the pathway to substantialize MVL systems.


heterojunction structure; light-triggered ternary inverter; multivalued logic; negative differential transconductance; van der Waals material


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