Toward reversing Joule heating with a phonon-absorbing heterobarrier

Shin, SangJoon; Kaviany, Massoud

doi:10.1103/physrevb.91.085301

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Recent advances in computational quantum mechanics allowed for an extension of heat transfer research into thermoelectric materials and electron-phonon coupling. The function of quantum mechanics (ab initio treatments) is established as central to advances in heat transfer research [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Atomic-Level, Energy-Conversion Heat Transfer

Kaviany

2021

Journal of Heat Transfer

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Heat is stored in quanta of kinetic and potential energies in matter. The temperature represents the equilibrium and exciting occupation (boson) of these energy conditions. Temporal and spatial temperature variations and heat transfer are associated with the kinetics of these equilibrium excitations. During energy-conversion (between electron and phonon systems), the occupancies deviate from equilibria, while holding atomic-scale, inelastic spectral energy transfer kinetics. Heat transfer physics reaches nonequilibrium energy excitations and kinetics among the principal carriers, phonon, electron (and holes and ions), fluid particle, and photon. This allows atomic-level tailoring of energetic materials and energy-conversion processes and their efficiencies. For example, modern thermal-electric harvesters have transformed broad-spectrum, high-entropy heat into a narrow spectrum of low-entropy emissions to efficiently generate thermal electricity. Phonoelectricity, in contrast, intervenes before a low-entropy population of nonequilibrium optical phonons becomes a high-entropy heat. In particular, the suggested phonovoltaic cell generates phonoelectricity by employing the nonequilibrium, low-entropy, and elevated temperature optical-phonon produced population–for example, by relaxing electrons, excited by an electric field. A phonovoltaic material has an ultra-narrow electronic bandgap, such that the hot optical-phonon population can relax by producing electron-hole pairs (and power) instead of multiple acoustic phonons (and entropy). Examples of these quanta and spectral heat transfer are reviewed, contemplating a prospect for education and research in this field.

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Section: Introductionmentioning

confidence: 99%

Atomic-Level, Energy-Conversion Heat Transfer

Kaviany

2021

Journal of Heat Transfer

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“…Other nonequilibrium phonon harvesting schemes have received attention for their ability to surpass the TE limits in scale and efficiency. These include the laser cooling of ion-doped materials through antiStokes florescence 11,12 , and the use of in-situ electron barriers to recycle phonons emitted during the Joule heating 13,14 . Conversely, the pV cell focuses on power generation.…”

Section: Introductionmentioning

confidence: 99%

Phonovoltaic. I. Harvesting hot optical phonons in a nanoscalep−njunction

Melnick

Kaviany

2016

Phys. Rev. B

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The phonovoltaic (pV) cell is similar to the photovoltaic. It harvests nonequilibrium (hot) optical phonons (E p,O ) more energetic than the bandgap (∆E e,g ) to generate power in a p-n junction.We examine the theoretical electron-phonon and phonon-phonon scattering rates, the Boltzmann transport of electrons, and the diode equation and hydrodynamic simulations to describe the operation of a pV cell and develop an analytic model predicting its efficiency. Our findings indicate that a pV material with E p,O ≃ ∆E e,g ≫ k B T , where k B T is the thermal energy, and a strong interband electron-phonon coupling surpasses the thermoelectric limit, provided the optical phonon population is excited in a nanoscale cell -enabling the ensuing local nonequilibrium. Finding and tuning a material with these properties is challenging. In Part II (this issue), we tune the bandgap of graphite within density functional theory through hydrogenation and the application of uniaxial strains. The bandgap is tuned to resonate with its energetic optical phonon modes and calculate the ab initio electron-phonon and phonon-phonon scattering rates. While hydrogenation degrades the strong electron-phonon coupling in graphene such that the figure of merit vanishes, we outline the methodology for a continued material search.

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Acoustic phonon recycling for photocarrier generation in graphene-WS2 heterostructures

Wei

Sui

et al. 2020

Nat Commun

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Electron-phonon scattering is the key process limiting the efficiency of modern nanoelectronic and optoelectronic devices, in which most of the incident energy is converted to lattice heat and finally dissipates into the environment. Here, we report an acoustic phonon recycling process in graphene-WS 2 heterostructures, which couples the heat generated in graphene back into the carrier distribution in WS 2. This recycling process is experimentally recorded by spectrally resolved transient absorption microscopy under a wide range of pumping energies from 1.77 to 0.48 eV and is also theoretically described using an interfacial thermal transport model. The acoustic phonon recycling process has a relatively slow characteristic time (>100 ps), which is beneficial for carrier extraction and distinct from the commonly found ultrafast hot carrier transfer (~1 ps) in graphene-WS 2 heterostructures. The combination of phonon recycling and carrier transfer makes graphene-based heterostructures highly attractive for broadband high-efficiency electronic and optoelectronic applications.

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Toward reversing Joule heating with a phonon-absorbing heterobarrier

Cited by 5 publications

References 34 publications

Atomic-Level, Energy-Conversion Heat Transfer

Atomic-Level, Energy-Conversion Heat Transfer

Phonovoltaic. I. Harvesting hot optical phonons in a nanoscalep−njunction

Acoustic phonon recycling for photocarrier generation in graphene-WS2 heterostructures

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