Ultrafast graphene photodetector.

By Fengnian Xia, Thomas Mueller, Yu-ming Lin, A. Valdes-Garcia, Phaedon Avouris. Nature Nanotechnology, 2009

2,884 citations recorded by the source corpus.

Graphene research so far has focused on electronic rather than photonic applications, in spite of its impressive optical properties. These include its ability to absorb approximately 2% of incident light over a broad wavelength range despite being just one atom thick. Here, we demonstrate ultrafast transistor-based photodetectors made from single- and few-layer graphene. The photoresponse does not degrade for optical intensity modulations up to 40 GHz, and further analysis suggests that the intrinsic bandwidth may exceed 500 GHz. The generation and transport of photocarriers in graphene differ fundamentally from those in photodetectors made from conventional semiconductors as a result of the unique photonic and electronic properties of the graphene. This leads to a remarkably high bandwidth, zero source-drain bias and dark current operation, and good internal quantum efficiency.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b0d74e9219e5f2d5c002e1086d6a23e2852dc66d

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Citations in the corpus

Platinum nanoparticle ensemble-on-graphene hybrid nanosheet: one-pot, rapid synthesis, and used as new electrode material for electrochemical sensing. (2010, background): “23 It is flexible yet stronger than diamond(24) and has a huge electrical mobility approaching 200 000 cm(2) V 1 s 1 for a free sheet for both electrons and holes.(25) These unique characteristics hold great promise for potential applications in many technological fields such as nanoelectronics,(26)”
Strong plasmonic enhancement of photovoltage in graphene. (2011, background): “In particular, graphene-based photodetectors have excellent characteristics in terms of quantum efficiency and reaction time, because of the very large room-temperature mobility and high Fermi velocity of charge carriers in this materia”
Nobel Lecture: Graphene: Materials in the Flatland (2011, background): “In photonics, ultrafast photodetectors (Xia et al., 2009) (utilizing the high mobility and high Fermi velocity of quasiparticles in graphene) and extremely efficient mode lockers (Zhang et al., 2009) must be noted.”
Synthesis of few-layer GaSe nanosheets for high performance photodetectors. (2012, background): “Ultrathin GaSe can strongly absorb photons from the visible to the nearultraviolet, and electron hole pairs are generated.(31) Figure 2.”