Changes in frequency-dependent dielectric features of monolayer graphene/silicon structure due to gamma irradiation

Seven, Elanur; Orhan, Elif; Ocak, Sema Bi̇lge

doi:10.1088/1402-4896/ac369f

Cited by 5 publications

(1 citation statement)

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“…Monolayer Gr is a promising material for photodetector applications owing to its conductivity, ultrahigh mobility and stability, which are ideal properties for high-speed photodetection [23][24][25]. However, the light absorption of monolayer Gr is very weak because of its ultrathin structure and zero band gap.…”

Section: Introductionmentioning

confidence: 99%

A facile covalent strategy for ultrafast negative photoconductance hybrid graphene/porphyrin-based photodetector

Li¹,

Ma²,

Mu³

et al. 2022

Nanotechnology

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As a powerful complement to positive photoconductance (PPC), negative photoconductance (NPC) holds great potential for photodetector. However, the slow response of NPC relative to PPC devices limits their integration. Here, we propose a facile covalent strategy for an ultrafast NPC hybrid 2D photodetector. Our transistor-based graphene/porphyrin model device with a rise time of 0.2 ms and decay time of 0.3 ms has the fastest response time in the so far reported NPC hybrid photodetectors, which is attributed to efficient photogenerated charge transport and transfer. Both the photosensitive porphyrin with an electron-rich and large rigid structure and the built-in graphene frame with high carrier mobility are prone to the photogenerated charge transport. Especially, the intramolecular donor-acceptor system formed by graphene and porphyrin through covalent bonding promotes photoinduced charge transfer. This covalent strategy can be applied to other nanosystems for high-performance NPC hybrid photodetector.

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Section: Introductionmentioning

confidence: 99%