Fig. 1. Schematic diagram of device structure

Fig. 2. Electrical testing system

Fig. 3. Electrical testing results of device 1 with 520 nm and 1 060 nm illumination

Fig. 4. Electrical testing results of device 2 with 520 nm and 1 060 nm illumination

Fig. 5. Performance characterization of device 1（Sample 1）and device 2（Sample 4）in terahertz band