Tracking Ultrafast Photocurrent Generation and Transport in hBN-Encapsulated Graphene Using On-Chip THz Spectroscopy
- Resource Type
- Conference
- Authors
- Yoshioka, K.; Wakamura, T.; Hashisaka, M.; Watanabe, K.; Taniguchi, T.; Kumada, N.
- Source
- 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) Infrared, Millimeter and Terahertz Waves (IRMMW-THz),2022 47th International Conference on. :1-2 Aug, 2022
- Subject
- Aerospace
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Signal Processing and Analysis
Spectroscopy
Graphene
Bandwidth
Zinc oxide
Photodetectors
System-on-chip
Telecommunications
- Language
- ISSN
- 2162-2035
We investigate ultrafast photocurrent generation and transport in high-quality graphene photodetector (PD) with its intrinsic time scale using on-chip THz spectroscopy and ZnO gate structure with the minimum capacitive coupling. We successfully readout photothermoelectric current with the 3 dB bandwidth of 220 GHz, which is previously limited to around 70 GHz due to bandwidth limitation of readout electronics and the large RC time constant of the device. As a result, we comprehensively understood how incident light is converted to electrical current in graphene, which is crucial information for developing ultrafast graphene optoelectronics towards the next generation of telecom and datacom.