Waveguide-integrated black phosphorus photodetector with high responsivity and low dark current

Nathan Youngblood, Che Chen, Steven J. Koester, Mo Li

Research output: Contribution to journalArticlepeer-review

781 Scopus citations

Abstract

Layered two-dimensional materials have demonstrated novel optoelectronic properties and are well suited for integration in planar photonic circuits. Graphene, for example, has been utilized for wideband photodetection. However, because graphene lacks a bandgap, graphene photodetectors suffer from very high dark current. In contrast, layered black phosphorous, the latest addition to the family of two-dimensional materials, is ideal for photodetector applications due to its narrow but finite bandgap. Here, we demonstrate a gated multilayer black phosphorus photodetector integrated on a silicon photonic waveguide operating in the near-infrared telecom band. In a significant advantage over graphene devices, black phosphorus photodetectors can operate under bias with very low dark current and attain an intrinsic responsivity up to 135 mA W-1 and 657 mA W-1 in 11.5-nm- and 100-nm-thick devices, respectively, at room temperature. The photocurrent is dominated by the photovoltaic effect with a high response bandwidth exceeding 3 GHz.

Original languageEnglish (US)
Pages (from-to)247-252
Number of pages6
JournalNature Photonics
Volume9
Issue number4
DOIs
StatePublished - Mar 31 2015

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