Two-dimensional tungsten photonic crystals as selective thermal emitters

Čelanović, Ivan; Jovanović, Natalija; Kassakian, J.G.

doi:10.1063/1.2927484

Cited by 174 publications

(141 citation statements)

References 13 publications

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“…For instance Yablonovitch already proposed in his pioneering work on photonic crystals [7] that spontaneous emission could be inhibited within the photonic band gap regions. Since then, several structures have been proposed for selective thermal emission in the TPV context such as 1D metal-dielectric stacks [8], 2D arrays of metallic microcavities [4,9,10], and metallic 3D photonic crystals [3,6]. Metallic structures are typically preferred as they naturally keep the emission low at long wavelengths, while the emissivity can be enhanced at shorter wavelengths through micro-structuring.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional metallo-dielectric selective thermal emitters with high-temperature stability for thermophotovoltaic applications

Garín

Hernández

Trifonov

et al. 2015

Solar Energy Materials and Solar Cells

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Selective thermal emitters concentrate most of their spontaneous emission in a spectral band much narrower than a blackbody. When used in a thermophovoltaic energy conversion system, they become key elements defining both its overall system efficiency and output power. Selective emitters' radiation spectra must be designed to match their accompanying photocell's band gap and, simultaneously, withstand high temperatures (above 1000 K) for long operation times. The advent of nanophotonics has allowed the engineering of very selective emitters and absorbers; however, thermal stability remains a challenge since 1 of 22 nanostructures become unstable at temperatures much below the melting point of the used materials. In this paper we explore an hybrid 3D dielectric-metallic structure that combines the higher thermal stability of a monocrystalline 3D Silicon scaffold with the optical properties of a thin Platinum film conformally deposited on top. We show experimentally that these structures exhibit a selective emission spectrum suitable for TPV applications and that they are thermally stable at temperatures up to 1100 K. These structures are ideal in combination with III-V semiconductors in the range Eg=0.4-0.55 eV such as InGaAsSb (Eg=0.5-0.6 eV) and InAsSbP (Eg=0.3-0.55 eV).

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Section: Introductionmentioning

confidence: 99%

Three-dimensional metallo-dielectric selective thermal emitters with high-temperature stability for thermophotovoltaic applications

Garín

Hernández

Trifonov

et al. 2015

Solar Energy Materials and Solar Cells

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“…Photonic crystals [14,15] and nanoparticles [16][17][18] were also proposed for selective absorption in visible and NIR range. Highly-efficient solar absorbers require a broad absorption band from visible to NIR range, which could be attained with different geometric approaches.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient selective metamaterial absorber for high-temperature solar thermal energy harvesting

Wang

Sivan²,

Mitchell³

et al. 2015

Solar Energy Materials and Solar Cells

254

131

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ABSTRACT:In this work, a metamaterial selective solar absorber made of nanostructured titanium gratings deposited on an ultrathin MgF 2 spacer and a tungsten ground film is proposed and experimentally demonstrated. Normal absorptance of the fabricated solar absorber is characterized to be higher than 90% in the UV, visible and, near infrared (IR) regime, while the mid-IR emittance is around 20%. The high broadband absorption in the solar spectrum is realized by the excitation of surface plasmon and magnetic polariton resonances, while the low mid-IR emittance is due to the highly reflective nature of the metallic components. Further directional and polarized reflectance measurements show wide-angle and polarization-insensitive high absorption within solar spectrum. Temperature-dependent spectroscopic characterization indicates that the optical properties barely change at elevated temperatures up to 350°C. The solar-to-heat conversion efficiency with the fabricated metamaterial solar absorber is predicted to be 78% at 100°C without optical concentration or 80% at 400°C with 25 suns, and could be further improved with better fabrication processes and geometric optimization during metamaterial design. The strong spectral selectivity, favorable diffuse-like behavior, and excellent thermal stability make the metamaterial selective absorber promising for significantly enhancing solar thermal energy harvesting in various system at mid to high temperatures.

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“…It may be achieved by using cold-side filters [67], modifying the photonic density of states to achieve wavelength selectivity, or combining emitter selectivity with a filter [29]. The 1D, 2D or 3D PhCs [50,61,[68][69][70] and metamaterials [52,54,71] are good examples of structures that can strongly modify the photonic density of states. In fact, among all of these approaches, 2D metallic PhCs have garnered the greatest interest for STPV systems [6,7,68], because of the high abundance ranking of refractory metals, and the ability to preferentially tailor near-blackbody emissivity at the designed wavelength range and suppress emission outside.…”

Section: Selective Thermal Emittersmentioning

confidence: 99%

Solar thermophotovoltaics: reshaping the solar spectrum

et al. 2016

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Abstract:Recently, there has been increasing interest in utilizing solar thermophotovoltaics (STPV) to convert sunlight into electricity, given their potential to exceed the Shockley-Queisser limit. Encouragingly, there have also been several recent demonstrations of improved systemlevel efficiency as high as 6.2%. In this work, we review prior work in the field, with particular emphasis on the role of several key principles in their experimental operation, performance, and reliability. In particular, for the problem of designing selective solar absorbers, we consider the trade-off between solar absorption and thermal losses, particularly radiative and convective mechanisms. For the selective thermal emitters, we consider the tradeoff between emission at critical wavelengths and parasitic losses. Then for the thermophotovoltaic (TPV) diodes, we consider the trade-off between increasing the potential short-circuit current, and maintaining a reasonable opencircuit voltage. This treatment parallels the historic development of the field, but also connects early insights with recent developments in adjacent fields. With these various components connecting in multiple ways, a system-level end-to-end modeling approach is necessary for a comprehensive understanding and appropriate improvement of STPV systems. This approach will ultimately allow researchers to design STPV systems capable of exceeding recently demonstrated efficiency values.

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Two-dimensional tungsten photonic crystals as selective thermal emitters

Cited by 174 publications

References 13 publications

Three-dimensional metallo-dielectric selective thermal emitters with high-temperature stability for thermophotovoltaic applications

Three-dimensional metallo-dielectric selective thermal emitters with high-temperature stability for thermophotovoltaic applications

Highly efficient selective metamaterial absorber for high-temperature solar thermal energy harvesting

Solar thermophotovoltaics: reshaping the solar spectrum

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