A novel self-powering ultrathin TEG device based on micro/nano emitter for radiative cooling

Mu, Erzhen; Wu, Zhenhua; Wu, Zhimao; Chen, Xiang; Liu, Yang; Fu, Xuecheng; Hu, Zhiyu

doi:10.1016/j.nanoen.2018.10.057

Cited by 120 publications

(67 citation statements)

References 35 publications

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“…( 1 ) can reach a high value by increasing the radiative power of the structural polymers and reducing either the solar absorption or parasitic heat gain 34 . These parameters can be calculated by the following equations 26 , 53 – 55 : where A is the surface area of the radiative cooler. is the angular integral over a hemisphere.…”

Section: Methodsmentioning

confidence: 99%

A structural polymer for highly efficient all-day passive radiative cooling

et al. 2021

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All-day passive radiative cooling has recently attracted tremendous interest by reflecting sunlight and radiating heat to the ultracold outer space. While some progress has been made, it still remains big challenge in fabricating highly efficient and low-cost radiative coolers for all-day and all-climates. Herein, we report a hierarchically structured polymethyl methacrylate (PMMA) film with a micropore array combined with random nanopores for highly efficient day- and nighttime passive radiative cooling. This hierarchically porous array PMMA film exhibits sufficiently high solar reflectance (0.95) and superior longwave infrared thermal emittance (0.98) and realizes subambient cooling of ~8.2 °C during the night and ~6.0 °C to ~8.9 °C during midday with an average cooling power of ~85 W/m2 under solar intensity of ~900 W/m2, and promisingly ~5.5 °C even under solar intensity of ~930 W/m2 and relative humidity of ~64% in hot and moist climate. The micropores and nanopores in the polymer film play crucial roles in enhancing the solar reflectance and thermal emittance.

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Section: Methodsmentioning

confidence: 99%

A structural polymer for highly efficient all-day passive radiative cooling

et al. 2021

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“…Sb 2 Te 3 and its derivatives are considered to be one of the best p‐type TE materials near room temperature . Compared with its bulk counterparts, nanostructured Sb 2 Te 3 film provides promising possibilities for enhanced TE properties and potential applications in micro/nanoelectromechanical systems (MEMS/NEMS) TE device . Experimentally, Sb 2 Te 3 has been prepared by various approaches such as physical vapor deposition (PVD), solid state reaction, and chemical synthesis method and so on .…”

Section: Introductionmentioning

confidence: 99%

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Chen

et al. 2019

Adv Elect Materials

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κ, κ e , κ L , and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity, electrical thermal conductivity, lattice thermal conductivity, and absolute working temperature, respectively. [1,2] Since α, σ, and κ are strongly coupled with each other, a simple improvement in single parameter usually results in a deterioration of the others. The challenge of realizing superior TE properties lies in the improvement of ZT, that is, simultaneously increasing in power factor (PF = α 2 σ) and suppressing κ. Normally, α enhancement can be achieved by a carrier energy filtering effect, caused by band bending at the nanointerfaces between nanoparticle and TE host materials. [2-4] Meanwhile, reducing κ L by phonon scattering is an effective way to reduce κ while maintaining a high σ. Very recently, lattice strains regulated by annealing time have also been observed for remarkably decreasing κ without affecting the carrier mobility (µ). [3] Sb 2 Te 3 and its derivatives are considered to be one of the best p-type TE materials near room temperature. [5] Compared with its bulk counterparts, nanostructured Sb 2 Te 3 film provides promising possibilities for enhanced TE properties and potential applications in micro/nanoelectromechanical systems (MEMS/NEMS) TE device. [6] Experimentally, Sb 2 Te 3 has been prepared by various approaches such as physical vapor deposition (PVD), solid state reaction, and chemical synthesis method and so on. [1,7,8] The effect of substrate, annealing temperature, and thickness on PF as well as the strain-and grain size-dependent κ in Sb 2 Te 3 films was studied. [9-11] PF can be enhanced by introducing nanoscale metal/semimetals into

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“…Compared with its bulk counterparts, nanostructured Bi 2 Te 3 film provides promising possibilities for enhanced TE properties and potential applications in micro/nanoelectromechanical systems (MEMS/NEMS) TE device [8]. The thermoelectric performance of Bi 2 Te 3 can be optimized by adjusting the (00l) orientation [9,10], pores [9,11], nanosheet boundary [12,13], and the intrinsic defects [14,15].…”

Section: Introductionmentioning

confidence: 99%

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

Zhang

Liu

et al. 2021

Micromachines

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The interface affects the transmission behavior of electrons and phonons, which in turn determines the performance of thermoelectric materials. In this paper, metals (Cu, Ag, Au)/Al2O3/Bi2Te3 heterostructures have been fabricated from bottom to up to optimize the thermoelectric power factor. The introducing metals can be alloyed with Bi2Te3 or form interstitials or dopants to adjust the carrier concentration and mobility. In addition, the metal-semiconductor interface as well as the metal-insulator-semiconductor interface constructed by the introduced metal and Al2O3 would further participate in the regulation of the carrier transport process. By adjusting the metal and oxide layer, it is possible to realize the simultaneous optimization of electric conductivity and Seebeck coefficient. This work will enable the optimal and novel design of heterostructures for thermoelectric materials with further improved performance.

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A novel self-powering ultrathin TEG device based on micro/nano emitter for radiative cooling

Cited by 120 publications

References 35 publications

A structural polymer for highly efficient all-day passive radiative cooling

A structural polymer for highly efficient all-day passive radiative cooling

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

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A novel self-powering ultrathin TEG device based on micro/nano emitter for radiative cooling

Cited by 120 publications

References 35 publications

A structural polymer for highly efficient all-day passive radiative cooling

A structural polymer for highly efficient all-day passive radiative cooling

Lattice Strain Enhances Thermoelectric Properties in Sb2Te3/Te Heterostructure

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

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Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure