▎ 摘　　要

In this work, we fabricate a heterojunction small-signal generator (HSSG) based on a graphene-molybdenum disulfide (MoS2) heterojunction. The HSSG is fundamentally different from any analog device developed previously. The HSSG is composed of two quasi-2D heterojunctions and has three terminals named injector (I), recombinator (R), and generator (G). MoS2 serves as I and G, and graphene works as R in the HSSG. The scale coefficient (beta = I-G/I-R) of the HSSG is 1.14 x 10(-4) (V-IG,V-IR = 0.2V) to 1.95 x 10(-4) (V-IG,V-IR = 1V). The current generated from G could be as low as pA scale, which reveals the good performance of the HSSG. (C) 2013 AIP Publishing LLC.