Still, there were some distinct challenges involved with MoS2. In normal silicon, a transistor's threshold voltage can be adjusted by doping the silicon—implanting impurities that change the semiconductor's behavior. But there's no way to implant an impurity in a single molecule. All of the semiconductors of RV32-WUJI are n-type, and their performance can't be adjusted. So the researchers here used two different metals (aluminum and gold) for the wiring and adjusted each transistor's threshold v...