scholarly journals Dual dielectric cap gold nanoslits array optical resonance filter with large figure-of-merit

2020 ◽  
Vol 28 (22) ◽  
pp. 32456
Author(s):  
Rong He ◽  
Cheng Chen ◽  
Rongjun Zhang ◽  
Liangyao Chen ◽  
Junpeng Guo
Keyword(s):  
Figure Of Merit ◽  
Optical Resonance ◽  
Large Figure

Large figure of merit ZT = 1.88 at 873 K achieved with nanostructured Si0.55Ge0.35(P0.10Fe0.01)

2019 ◽  
Vol 12 (4) ◽  
pp. 045507 ◽  
Author(s):  
Kévin Delime-Codrin ◽  
Muthusamy Omprakash ◽  
Swapnil Ghodke ◽  
Robert Sobota ◽  
Masahiro Adachi ◽  
...  
Keyword(s):  
Figure Of Merit ◽  
Large Figure

Elastic constants, electronic properties and thermoelectric response of LiAlX (X=C, Si, Ge, And Sn) half-Heusler

2021 ◽  
Vol 68 (1 Jan-Feb) ◽  
Author(s):  
ROZALE HABIB ◽  
M. Khetir ◽  
A. Maafa ◽  
F. Boukabrime ◽  
A. Bouabça ◽  
...  
Keyword(s):  
Band Gap ◽  
Figure Of Merit ◽  
Mechanical Stability ◽  
Full Potential ◽  
Thermoelectric Efficiency ◽  
Augmented Plane Wave ◽  
Main Research ◽  
Wide Range ◽  
Large Figure ◽  
Linearized Augmented Plane Wave

Since they have become indispensable in various technological applications and a powerfulsource for generating energy in thermoelectric devices, Lithium-based alloys symbolize the topicof many experimental and theoretical reports. Hence, LiAlX(X = C, Si, Ge, Sn) materials representthe main research in this study. Different interesting properties such as the effect of pressure onthe band gap as well as the elastic parameters and the thermoelectric efficiency of these materialswere investigated using the full potential linearized augmented plane wave (FP-LAPW) method.LiAlX alloys were found to be semiconducting with indirect band gaps. When studying themechanical properties, we found that LiAlC alloy is stable against a wide range of pressurechanges (90 GPa), while the rest three systems preserve their mechanical stability in a moderaterespectively range of 40, 50 and 30 GPa, respectively. The semiconducting band gap for eachpossible transition have been calculated in a range of different pressures using both GGA andmBJ-GGA approximations. The results ended up revealing a decaying trend of the indirect gapalong Г-X direction with the increase of pressure. High values of the power factor were achievedand a large figure of merit (almost 0.7 for all systems) was calculated at 600K, which makesthese Li-based alloys very auspicious in the thermoelectric field applications.

New route to enhanced figure of merit at nano scale: effect of AAH modulation

2021 ◽  
Author(s):  
Moumita Dey ◽  
Suvendu Chakraborty ◽  
Santanu K Maiti
Keyword(s):  
Figure Of Merit ◽  
Nearest Neighbor ◽  
Tight Binding ◽  
Thermal Conductance ◽  
Transmission Function ◽  
Energy Conversion Efficiency ◽  
Thermoelectric Efficiency ◽  
Thermoelectric Energy ◽  
Large Figure ◽  
First Time

Abstract We report, for the first time, the phenomenon of thermoelectricity at quantum level considering a correlated disordered tight-binding (TB) one-dimensional lattice where site energies and/or nearest-neighbor hopping integrals are modulated in the cosine form following the well known Aubry-Andre-Harper (AAH) model. The atypical gapped and fragmented energy spectrum yields a transmission function whose steepness is not symmetrical around Fermi energy, and because of this fact, we obtain a reasonably large figure of merit, a quantity that measures the thermoelectric energy conversion efficiency. The efficiency can be further monitored by means of AAH phase(s) which undoubtedly gives a possible route of designing controlled thermoelectric devices. Evaluating transmission probabilities using the Green's function formalism, we compute all the thermoelectric quantities based on the Landauer integrals. The diagonal, off-diagonal and generalized versions of the AAH model are taken into account, and in all the cases we find favorable thermoelectric response. At the end of our analysis, we discuss briefly the specific role of phonon thermal conductance on thermoelectric efficiency to make the present investigation a self-contained one. Our theoretical study may shed some light in analyzing thermoelectric phenomena in similar kind of quasicrystals and other related systems.

Sn-based type-VIII single-crystal clathrates with a large figure of merit

2012 ◽  
Vol 21 (1) ◽  
pp. 017401 ◽  
Author(s):  
Shu-Kang Deng ◽  
De-Cong Li ◽  
Lan-Xian Shen ◽  
Rui-Ting Hao ◽  
T. Takabatake
Keyword(s):  
Single Crystal ◽  
Figure Of Merit ◽  
Type Viii ◽  
Large Figure

scholarly journals Спектральные характеристики наклонного отражательного интерферометра как сенсора показателя преломления

2021 ◽  
Vol 129 (2) ◽  
pp. 238
Author(s):  
В.С. Терентьев ◽  
В.А. Симонов
Keyword(s):  
Spectral Properties ◽  
Figure Of Merit ◽  
Multilayer Coating ◽  
Spectral Width ◽  
Refractive Index Sensor ◽  
Kretschmann Configuration ◽  
Reflection Maximum ◽  
Large Figure ◽  
Sensitive Structure ◽  
First Time

The paper presents simulation of the refractive index sensor of the analyzed liquid in the Kretschmann configuration based on an oblique reflective interferometer (RI) and its spectral properties for the first time. The principle of operation of this sensor is based on the effect of inverted surface plasmon resonance (ISPR). The sensitive structure is the metal-dielectric multilayer coating based on a nickel thin film in combination with non-quartewavelength dielectric layers. Modeling of the RI manufacturing process under oblique light incidence is described. Formulas for estimating the sensitivity and spectral width of the reflection maximum of ISPR are given, as well as the figure of merit. It is shown that due to the high quality factor, this type of sensor can have very large figure of merit (>10^3).

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