Solution-Processed MoS₂-Based Back-to-Back Diodes Circuit Applications for Signal Demodulators and Envelope Detectors

Voice-user interface enables humans to interact with electronic devices through voice commands, thereby providing exceptionally convenient experiences in various touch-free applications based on user-voice recognition. To recognize and process voice information, precise sound signal analysis is required by using an envelope detector that can convert the oscillating voice signal to the enveloped signal. In this work, we present a platinum/molybdenum disulfide (Pt/MoS2) back-to-back (BTB) diodes architecture that, only with a single-device unit, can function as a frequency detector and an envelope detector. Benefiting from electrostatic control of the doping level of the MoS2 channel, the device exhibited both high and low resistance–capacitance delay operation (under floating and high gate voltage conditions) toward multidemodulator without any loop filter circuit components. We thus believe that our gate tunable BTB diodes circuit would be a promising key technique toward the high-integration and low-power applications for future mobile electronics.