Abstract
With its high mobility, narrow bandgap, and unique anisotropy, black phosphorus (BP) is a promising material for optoelectronic applications. Waveguide-integrated photodetectors with RC-limited speeds up to 3 GHz have been recently demonstrated at telecom wavelengths. To truly be competitive, however, BP photodetectors must reach speeds of tens of GHz. Here, we use BP's nonlinear photoresponse to measure the intrinsic speed of a BP photodetector using ultrafast pump-probe measurements. With this technique, we are able to observe how the detection speed depends on both the incident power and applied source-drain bias. A minimum response time of 60 ps was observed which corresponds to an intrinsic bandwidth of 9 GHz.
| Original language | English (US) |
|---|---|
| Article number | 051102 |
| Journal | Applied Physics Letters |
| Volume | 110 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jan 30 2017 |
Bibliographical note
Funding Information:This work was supported by the Air Force Office of Scientific Research (Award No. FA9550-14-1-0277) and the National Science Foundation (Award No. ECCS-1351002). Device fabrication was carried out at the University of Minnesota Nanofabrication Center, which receives partial support from the NSF through the National Nanotechnology Coordinated Infrastructure (NNCI) program. The authors also used resources at the Characterization Facility, which is a member of the NSF-funded Materials Research Facilities Network via the NSF MRSEC program.
Publisher Copyright:
© 2017 Author(s).