Quantum Cosmology of f(R, T) gravity

Xu, Minxing; Harkó, Tiberiu; Liang, Shi-Dong

doi:10.1140/epjc/s10052-016-4303-6

Cited by 84 publications

(34 citation statements)

References 59 publications

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“…The thickness of the resulting film is solely controlled by the thickness of the bulk precursor film. Xu et al [152] followed this work and developed an approach to increase the grain size with a flash evaporation process by varying the pressure and the precursor composition ratios. The resulting morphology change can be seen in Figure 14b.…”

Section: Flash Evaporation and Close Space Sublimation (Css)mentioning

confidence: 99%

“…b) SEM images of morphology changes from flash evaporation with different processing parameters. [152] c) Illustration of close space sublimation process. d) Photograph of perovskite film deposited via close space sublimation.…”

Section: Vapor-assisted Solution Process and Ion Exchangementioning

confidence: 99%

“…Flash evaporation 1 ITO/PEDOT:PSS/MAPI/PCBM/Ag 0.09 10.9% [155] Flash evaporation 2 ITO/PEDOT:PSS/MAPI/polyTPD/PCBM/Ba/Ag 0.09 12.2% [151] Flash evaporation 1 FTO/PCBM/MAPI/spiro-OMeTAD/Au 0.09 10.01% [152] Pulsed laser flash evaporation 1 FTO/NiO x /MAPI/C60/BC/Ag N/A N/A [156] Samples with * are stabilized power conversion efficiency. All others are the maximum measurements.…”

Section: Vapor-assisted Solution Process and Ion Exchangementioning

confidence: 99%

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Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films

Swartwout

Hoerantner

Bulović

2019

Energy & Environ Materials

196

179

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The recent steady improvements in the performance of the nascent hybrid perovskite photovoltaic (PV) devices have led to power conversion efficiencies that rival the best-performing established PV technologies. However, to scale these laboratory demonstrations to PV module-scale production will require development of scalable deposition methods for perovskite thin films. Every record result for perovskite PVs so far was achieved via spin coating, a technique that is popular in research laboratories for thin-film coating over relatively small device areas, but not considered to be a method that could be used to scale up the manufacturing of perovskite PVs. Significantly larger thin-film areas are needed for future commercial PV products. Hence, some researchers have focused their efforts on perovskite deposition techniques that can be considered as scalable for mass production and have achieved notable results even on large areas. Here, we present an overview of the solution-based and vapor-based deposition processes; we explain their influence on the molecular crystal growth behavior of perovskite thin films and discuss the morphology as well as other material quality characteristics. By presenting a comprehensive comparison of the deposition techniques and the corresponding performance parameters for different device sizes, we intent to guide the growing research community through the methods that might enable mass production of perovskite solar products.

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Section: Flash Evaporation and Close Space Sublimation (Css)mentioning

confidence: 99%

Section: Vapor-assisted Solution Process and Ion Exchangementioning

confidence: 99%

Section: Vapor-assisted Solution Process and Ion Exchangementioning

confidence: 99%

See 1 more Smart Citation

Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films

Swartwout

Hoerantner

Bulović

2019

Energy & Environ Materials

196

179

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“…(9) it follows that the matter energy-momentum tensor is not conserved, and its divergence is given by [52] (for the computational details see Appendix B), …”

Section: The Metric Formalismmentioning

confidence: 99%

Palatini formulation of f(R, T) gravity theory, and its cosmological implications

Jimin¹,

Li²,

Harkó³

et al. 2018

Eur. Phys. J. C

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We consider the Palatini formulation of f (R, T ) gravity theory, in which a non-minimal coupling between the Ricci scalar and the trace of the energy-momentum tensor is introduced, by considering the metric and the affine connection as independent field variables. The field equations and the equations of motion for massive test particles are derived, and we show that the independent connection can be expressed as the Levi-Civita connection of an auxiliary, energy-momentum trace dependent metric, related to the physical metric by a conformal transformation. Similar to the metric case, the field equations impose the nonconservation of the energy-momentum tensor. We obtain the explicit form of the equations of motion for massive test particles in the case of a perfect fluid, and the expression of the extra force, which is identical to the one obtained in the metric case. The thermodynamic interpretation of the theory is also briefly discussed. We investigate in detail the cosmological implications of the theory, and we obtain the generalized Friedmann equations of the f (R, T ) gravity in the Palatini formulation. Cosmological models with Lagrangians of the type f = R − α 2 /R + g(T ) and f = R + α 2 R 2 + g(T ) are investigated. These models lead to evolution equations whose solutions describe accelerating Universes at late times.

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“…Compared to f (R) theory, the field equations are second order instead of fourth one, which is an important advantage of f (T ) theory. As a further extension, and an analogy to that of f (R) theories [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], non-minimal torsion-matter coupling f (T ) gravity has been proposed and studied [30]. In the previous research [31], using the observation data of type Ia supernovae (SNeIa), cosmic microwave background (CMB), and baryon acoustic oscillations (BAO), we established two concrete f (T ) models with non-minimal torsion-matter coupling extension, and we found that they are successful in describing the observation of the Universe and its large-scale structure and evolution.…”

Section: Introductionmentioning

confidence: 99%

Solar system tests for realistic f(T) models with non-minimal torsion–matter coupling

Lin

Zhai

2017

Eur. Phys. J. C

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In the previous paper, we have constructed two f (T ) models with non-minimal torsion-matter coupling extension, which are successful in describing the evolution history of the Universe including the radiation-dominated era, the matter-dominated era, and the present accelerating expansion. Meantime, the significant advantage of these models is that they could avoid the cosmological constant problem of CDM. However, the non-minimal coupling between matter and torsion will affect the tests of the Solar system. In this paper, we study the effects of the Solar system in these models, including the gravitation redshift, geodetic effect and perihelion precession. We find that Model I can pass all three of the Solar system tests. For Model II, the parameter is constrained by the uncertainties of the planets' estimated perihelion precessions.

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Quantum Cosmology of f(R, T) gravity

Cited by 84 publications

References 59 publications

Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films

Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films

Palatini formulation of f(R, T) gravity theory, and its cosmological implications

Solar system tests for realistic f(T) models with non-minimal torsion–matter coupling

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