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A new photodetector structure based on graphene nanomeshes: an ab initio study
Babak Sakkaki1, Hassan Rasooli Saghai2, Ghafar Darvish1
1Department of Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Beilstein Journal of Nanotechnology
|August 1, 2020
Summary
Graphene nanomeshes (GNMs) show promise for advanced photodetectors. Their unique electronic and optical properties offer significantly enhanced infrared detection capabilities compared to other graphene materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene-based materials are promising for next-generation electronic and optoelectronic devices.
- Graphene nanomeshes (GNMs) offer tunable electronic and optical properties due to their perforated structure.
Purpose of the Study:
- To investigate the electronic and optical characteristics of graphene nanomeshes (GNMs) for photodetector applications.
- To explore the device-level properties of GNMs using advanced computational methods.
Main Methods:
- Density Functional Theory (DFT) calculations to analyze electronic and optical properties.
- DFT-based tight-binding (DFTB) combined with non-equilibrium Green's function (NEGF) methods for device simulations.
- Band structure and absorption spectrum analysis of various GNM configurations.
Main Results:
- GNMs exhibit tunable metallic and semiconducting behaviors based on perforation patterns.
- Semiconducting GNMs show strong infrared absorption peaks, outperforming graphene nanoribbons (GNRs).
- Calculated detectivity for GNMs is significantly higher than for graphene and GNR-based devices.
Conclusions:
- Graphene nanomeshes are highly suitable for mid-infrared detector applications.
- The quantum effects arising from perforations enhance graphene's optical device performance.
- GNMs represent a significant advancement over existing graphene-based photodetectors.
