Optical properties of graphene

Falkovsky, L. A.

doi:10.1088/1742-6596/129/1/012004

Cited by 965 publications

(639 citation statements)

References 6 publications

Supporting

Mentioning

619

Contrasting

Unclassified

Order By: Relevance

“…Thus, the transition from the Boltzmann statistics to the Fermi-Dirac statistics are very much evident with the temperature rise in graphene and Si layers. 34 In overall, this led to the decrease in FF and η of cells with temperature rise.…”

Section: Quantum Efficiency Spectral Response and Temperature Depmentioning

confidence: 97%

“…This response verifies that the reflectance from the monolayer graphene is reduced in the infrared region and increased for shorter wavelengths due to the interband absorption. 34 Also, the better conductivity obtained at n-Gr/p-cSi interface or contacts by optimizing graphene layers in the simulation, helped in further tuning of the cell efficiency. Enhancement in the spectral response was observed with increasing doping concentrations in the layers, possibly due to significant increase in J sc .…”

Section: Quantum Efficiency Spectral Response and Temperature Depmentioning

confidence: 99%

See 1 more Smart Citation

Multilayer graphene as a transparent conducting electrode in silicon heterojunction solar cells

Patel

Tyagi

2015

AIP Advances

View full text Add to dashboard Cite

In this paper, the structure of a graphene/silicon heterojunction solar cell has been studied under simulated conditions. The parameters of the cell’s layers have been optimized by using AFORS-HET software. Instead of reported 2D nature, we considered graphene as 3D in nature. To ensure the formation of Schottky junction, electrical contacts were made along c-axis to collect the minority carriers, which generate upon illumination. By optimizing the various parameters of n-type multilayer graphene, we achieved the best-simulated cell with the power conversion efficiency of 7.62 % at room temperature. Up to 40 layers of n-type graphene, the efficiency found to be constant and enhanced only to 7.623 %. After further optimization of the parameters of p-crystalline silicon wafer, a maximum efficiency of 11.23 % has been achieved. Temperature dependence on the cell performance has also been studied and an efficiency of 11.38 % has been achieved at 270 K. Finally, we have demonstrated that n-type multilayer graphene can act as an excellent transparent conducting electrode.

show abstract

Section: Quantum Efficiency Spectral Response and Temperature Depmentioning

confidence: 97%

Section: Quantum Efficiency Spectral Response and Temperature Depmentioning

confidence: 99%

Multilayer graphene as a transparent conducting electrode in silicon heterojunction solar cells

Patel

Tyagi

2015

AIP Advances

View full text Add to dashboard Cite

show abstract

“…Note that it is important to include the substrate influence on electromagnetic radiation especially for atomically-thin materials 40,41 . Here, the current density in a monolayer MoS 2 sample is described by a delta function, j x =σ(ω)δ(z)E x whereσ is the complex conductivity and E x is the x-component of the probe electric field (along the sample's surface).…”

Section: Appendix B: Kramers-kronig Analysismentioning

confidence: 99%

Intervalley biexcitons and many-body effects in monolayerMoS2

et al. 2015

View full text Add to dashboard Cite

Interactions between two excitons can result in the formation of bound quasiparticles, known as biexcitons. Their properties are determined by the constituent excitons, with orbital and spin states resembling those of atoms. Monolayer transition metal dichalcogenides (TMDs) present a unique system where excitons acquire a new degree of freedom, the valley pseudospin, from which a novel intervalley biexciton can be created. These biexcitons comprise two excitons from different valleys, which are distinct from biexcitons in conventional semiconductors and have no direct analogue in atomic and molecular systems. However, their valley properties are not accessible to traditional transport and optical measurements. Here, we report the observation of intervalley biexcitons in the monolayer TMD MoS2 using ultrafast pump-probe spectroscopy. By applying broadband probe pulses with different helicities, we identify two species of intervalley biexcitons with large binding energies of 60 meV and 40 meV. In addition, we also reveal effects beyond biexcitonic pairwise interactions in which the exciton energy redshifts at increasing exciton densities, indicating the presence of many-body interactions among them.

show abstract

“…In such framework, the material's 2D conductivity reads [24,93] σ Kubo (ω) = σ intra (ω) + σ inter (ω), …”

Section: Appendix B: Dynamical Conductivity Of Graphenementioning

confidence: 99%

Modeling the excitation of graphene plasmons in periodic grids of graphene ribbons: An analytical approach

et al. 2016

View full text Add to dashboard Cite

We study electromagnetic scattering and subsequent plasmonic excitations in periodic grids of graphene ribbons. To address this problem, we develop an analytical method to describe the plasmon-assisted absorption of electromagnetic radiation by a periodic structure of graphene ribbons forming a diffraction grating for THz and mid-IR light. The major advantage of this method lies in its ability to accurately describe the excitation of graphene surface plasmons (GSPs) in one-dimensional (1D) graphene gratings without the use of both time-consuming, and computationally demanding full-wave numerical simulations. We thus provide analytical expressions for the reflectance, transmittance, and plasmon-enhanced absorbance spectra, which can be readily evaluated using any personal computer with little to no programming. We also introduce a semianalytical method to benchmark our previous results and further compare the theoretical data with spectra taken from experiments, for which we observe a very good agreement. These theoretical tools may therefore be applied to design new experiments and cutting-edge nanophotonic devices based on graphene plasmonics.

show abstract

Optical properties of graphene

Cited by 965 publications

References 6 publications

Multilayer graphene as a transparent conducting electrode in silicon heterojunction solar cells

Multilayer graphene as a transparent conducting electrode in silicon heterojunction solar cells

Intervalley biexcitons and many-body effects in monolayerMoS2

Modeling the excitation of graphene plasmons in periodic grids of graphene ribbons: An analytical approach

Contact Info

Product

Resources

About