Ferroelectric polymer tuned two dimensional layered MoTe₂ photodetector

Two dimensional material based photodetectors have attracted wide attention in recent years. In this work, a few-layer MoTe₂ based phototransistor with a ferroelectric polymer P(VDF-TrFE) topgate is fabricated. The remanent polarization of the ferroelectrics could deplete the channel effectively to decrease the dark current of the device by more than one magnitude. As a result, the MoTe₂ phototransistor has an appreciable photoresponse for visible light and near infrared. The device has a broad photoresponse range (0.6-1.5 μm), the responsivity and detectivity reach 16.4 mA W^-1 and 1.94 × 10⁸ Jones for 1060 nm light. The device works without an external gate voltage, which makes for higher reliability and lower power dissipation for practical application.