On conversion of luminescence into absorption and the van Roosbroeck-Shockley relation

Bhattacharya, Rupak; Pal, Bipul; Bansal, Bhavtosh

doi:10.1063/1.4721495

Cited by 69 publications

(48 citation statements)

References 25 publications

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“…On the other hand, it is also useful to evaluate the perovskite behavior in the ideal bimolecular limit, since, owed to their peculiar optical properties of these systems, we can expect unusually small recombination rates and extra‐long radiative lifetimes. To the aim, we used our ab‐initio band structure calculations in combinations with the band‐to‐band recombination rate calculated according to the Van Roosbroeck‐Shockley theory . In Figure , the recombination properties as a function of the injected electron‐hole population n at room temperature are reported.…”

Section: Resultsmentioning

confidence: 99%

Ag/In lead‐free double perovskites

Liu

Marongiu

Pau

et al. 2020

EcoMat

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Lead‐free Cs2AgInCl6 and Cs2AgInBr6 double perovskites are studied by a combination of advanced ab‐initio calculations and photoluminescence experiments. We show that they are insulators with direct band gaps of 2.53 and 1.17 eV, respectively; most importantly, they are characterized by unusually low absorption rates in a ~1 eV wide energy region above the band gap, caused by rather peculiar electronic properties. Consequently, this low absorption conveys very long recombination lifetimes, up to milliseconds at low temperature. Our theoretical analysis suggests that such materials can achieve a good compromise between photoconversion efficiency (above 10%) and visible transmittance (above 30%), which makes them potentially suited for lead‐free semitransparent solar cell applications.

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Section: Resultsmentioning

confidence: 99%

Ag/In lead‐free double perovskites

Liu

Marongiu

Pau

et al. 2020

EcoMat

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“…fu and fu are the Fermi-Dirac distributions of charge carries in the emitter material. The absorption rate σ(ω) is calculated under the condition that the upper state is empty and the lower state is full, and thus is uniquely defined by the available charge carrier DOS inside the material and by the transition selection rules imposed by momentum conservation [68,69]. Accordingly, the material absorption rate can be tailored by engineering the electron DOS, for example, via electron confinement effects.…”

Section: The Role Of Electron and Photon Densities Of States And The mentioning

confidence: 99%

“…Furthermore, most materials do not emit as blackbodies, and an energy-dependent "gray body" factor typically needs to be introduced to account for intrinsic material properties, which can be tailored by material engineering. For example, for a gray body semiconductor exhibiting an electronic bandgap and thus emitting photons carrying chemical potential, the emission rate is typically calculated via the van Roosbroeck-Shockley equation: [67][68][69]. This equation is valid for emitters exhibiting a quasi-thermal equilibrium within their respective electronic bands, including excited and ground state electrons, and also for µγ.…”

Section: The Role Of Electron and Photon Densities Of States And The mentioning

confidence: 99%

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Heat meets light on the nanoscale

et al. 2016

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Abstract:We discuss the state-of-the-art and remaining challenges in the fundamental understanding and technology development for controlling light-matter interactions in nanophotonic environments in and away from thermal equilibrium. The topics covered range from the basics of the thermodynamics of light emission and absorption to applications in solar thermal energy generation, thermophotovoltaics, optical refrigeration, personalized cooling technologies, development of coherent incandescent light sources, and spinoptics.Keywords: thermal emission; absorption; spectral selectivity; angular selectivity; optical refrigeration; solar thermal energy conversion; thermophotovoltaics; nearfield heat transfer; photon density of states; thermal upconversion; radiative cooling Thermodynamics of light and heatControl and optimization of energy conversion processes involving photon absorption and radiation require detailed understanding of thermodynamic properties of radiation as well as its interaction with matter [1-5]. Historically, thermodynamic treatment of electromagnetic radiation began over a century ago with Planck applying the thermodynamic principles established for a gas of material particles to an analogous "photon gas" [1]. In particular, he showed that thermodynamic parameters, such as the energy, volume, temperature, and pressure can be applied to electromagnetic radiation, reflecting the dual wave-particle nature of photons. In this section, we will review the general thermodynamic principles governing photon propagation and interaction with matter, as well

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“…with the spontaneous emission spectrum S ω, α(ω) calculated with a nonequilibrium Kubo-Martin-Schwinger relation as given, e.g., in Reference [35] using the absorption coefficient α(ω) proportional to the reciprocal periodicity length −1 . Numerically we find that the spontaneous emission current is below 1 A·cm −2 for QD densities up to 5 × 10 11 cm −2 and therefore negligible for the QD model under study.…”

Section: Setupmentioning

confidence: 99%

Mid-Infrared Quantum-Dot Quantum Cascade Laser: A Theoretical Feasibility Study

2016

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Abstract:In the framework of a microscopic model for intersubband gain from electrically pumped quantum-dot structures we investigate electrically pumped quantum-dots as active material for a mid-infrared quantum cascade laser. Our previous calculations have indicated that these structures could operate with reduced threshold current densities while also achieving a modal gain comparable to that of quantum well active materials. Here, we study the influence of two important quantum-dot material parameters, namely inhomogeneous broadening and quantum-dot sheet density, on the performance of a proposed quantum cascade laser design. In terms of achieving a positive modal net gain, a high quantum-dot density can compensate for moderately high inhomogeneous broadening, but at a cost of increased threshold current density. However, by minimizing quantum-dot density with presently achievable inhomogeneous broadening and total losses, significantly lower threshold densities than those reported in quantum-well quantum-cascade lasers are predicted by our theory.

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On conversion of luminescence into absorption and the van Roosbroeck-Shockley relation

Abstract: Articles you may be interested inQuasi-Fermi level splitting and sub-bandgap absorptivity from semiconductor photoluminescence Observation of room temperature optical absorption in InP/GaAs type-II ultrathin quantum wells and quantum dots

Cited by 69 publications

References 25 publications

Ag/In lead‐free double perovskites

Ag/In lead‐free double perovskites

Heat meets light on the nanoscale

Mid-Infrared Quantum-Dot Quantum Cascade Laser: A Theoretical Feasibility Study

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