Thermal emission of macroporous silicon chirped photonic crystals

Garín, M.; Trifonov, T.; Hernández, David; Rodriguez, A.; Alcubilla, R.

doi:10.1364/ol.35.003348

Cited by 12 publications

(12 citation statements)

References 13 publications

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“…Three-dimensional macroporous structures behave as photonic crystals [21,22], and exhibit interesting thermal emission characteristics [26][27][28]; however, they are not good candidates for TPV applications since it is very difficult to efficiently reduce thermal emission at large wavelength bands [28]. In order to take advantage of the good thermal stability of crystalline silicon 3D structures we decided to deposit a conformal thin metal layer over the structure.…”

Section: Sample Fabricationmentioning

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: Sample Fabricationmentioning

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

Self Cite

View full text Add to dashboard Cite

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“…The FDTD simulations show that in the vertical direction there is a narrow PBG (7:1%). A chirped modulation smoothly varying the vertical period can double the PBG width [46]. For the samples with included defects, initially the photonic response for a single defect was studied.…”

Section: Structure Designmentioning

confidence: 99%

Macroporous Silicon for Gas Detection

Vega¹,

Rodríguez²

2018

Applications of Silicon Photonics in Sensors and Waveguides

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Macroporous silicon (MPS) has been shown to be a promising material in many areas of technical interest. In particular, MPS has been applied for electronic devices and microfluidic applications. One of the most promising features of MPS is that it enables the development of optical applications using simple and cost-effective technology, compatible with MEMS fabrication processes and suitable for mass production. This chapter describes the application of MPS structures fabricated using electrochemical etching (EE) for the detection of gases of environmental concern in the wavelength range comprising 4 μmt o1 5μm, such as CO 2. Vertical-modulated MPS structures are reported, whose photonic bandgaps can be placed at different wavelengths depending on the application needs. These structures have been applied to the quantification of CO 2 , and these results are summarised here. Detection is performed by the direct measure of absorption, obtaining promising results with short optical paths.

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“…This is exploited to create 3-d structure by freely changing the IR illumination intensity as the pores progress. In spite of the limits to the achievable shapes imposed by the electrochemical system, it is possible to create very complex structures like chirped modulations [34], embedded defects [35], etc. MPS with pores with diameters down to 100 nm has been reported [36]; however, only straight pores have been shown, and surface quality is still low.…”

Section: Electrochemical Etchingmentioning

confidence: 99%

Macroporous Silicon: Technology and Applications

Bru¹,

Rodriguez²

2017

New Research on Silicon - Structure, Properties, Technology

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Macroporous silicon (MPS) is a versatile material that since its origin in the early 1990s has seen intense research and has found applications in many fields. MPS is a key technology in photonic crystals research, and optic and photonic applications are its main applications. However, this chapter is devoted to several of the non-photonic uses of MPS. In particular, new electronic and MEMS devices and applications will be described. Furthermore, in this chapter, the technology of MPS fabrication will be presented.

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Thermal emission of macroporous silicon chirped photonic crystals

Cited by 12 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

Macroporous Silicon for Gas Detection

Macroporous Silicon: Technology and Applications

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