Enhanced selective thermal emission with a meta-mirror following Generalized Snell’s Law

Khan, M. Ryyan; Wang, Xufeng; Sakr, Enas; Alam, Muhammad A.; Bermel, Peter

doi:10.1557/opl.2015.357

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Figure 7A shows the spectral matching between a mantle ytterbium(III) oxide (Yb 2 O 3 ) emitter and Si PV cell. Rare-earth elements can also be doped into rigid host materials, such as yttrium aluminum garnets [64], or fused silica glass [73] and backed by a metallic reflector to prevent emission to the back side. Although rareearth elements have their inherent natural selectivity, they still show low spectral efficiency, caused by either intrinsic emission tails of rare-earths at longer wavelengths, or by metallic back reflectors parasitic emission [64].…”

Section: Rare-earth Emittersmentioning

confidence: 99%

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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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Section: Rare-earth Emittersmentioning

confidence: 99%

“…Metasurface back reflectors are also suggested for emission enhancement of optically thin rare-earth-doped glasses employing generalized Snell's law. The idea is to modify reflection angles upon multiple bounces on the reflecting metasurface and eventually couple to a surface mode to achieve complete absorption [73].…”

Section: Rare-earth Emittersmentioning

confidence: 99%

Solar thermophotovoltaics: reshaping the solar spectrum

et al. 2016

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Performance analysis of evacuated solar thermal panels with an infrared mirror

et al. 2021

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High-temperature, spectrally-selective, scalable, and flexible thin-film Si absorber and emitter

Zhou

Tian

Hymel

et al. 2019

Opt. Mater. Express

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Solar thermal technologies have great potential to provide low-cost storage for solar energy. However, their efficiencies are limited by a lack of scalable, mechanically flexible, durable, yet highly-efficient spectrally-selective solar absorbers suitable for high temperatures at low solar concentrations. Here, we overcome these challenges by fabricating a scalable free-standing spectrally-selective thin-film Si absorber and emitter (SSTFS) composite. Its high-temperature emittance shows strong spectral selectivity, even at 595 °C. Thermal stability is proven by measuring optical properties before and after thermal cycling equivalent to one day of concentrated sunlight. Despite the use of crystalline Si, the fabricated SSTFS composite exhibits exceptional mechanical flexibility to cover most surface geometries. The SSTFS composite demonstrates the potential of high-temperature, efficient and flexible solar absorbers and thermal emitters to advance renewable solar energy with storage.

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Enhanced selective thermal emission with a meta-mirror following Generalized Snell’s Law

Cited by 3 publications

References 18 publications

Solar thermophotovoltaics: reshaping the solar spectrum

Solar thermophotovoltaics: reshaping the solar spectrum

Performance analysis of evacuated solar thermal panels with an infrared mirror

High-temperature, spectrally-selective, scalable, and flexible thin-film Si absorber and emitter

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