Strong Interference in Planar, Multilayer Perfect Absorbers: Achieving High-Operational Performances in Visible and Near-Infrared Regimes

Ghobadi, Amir; Hajian, Hodjat; Bütün, Bayram; Özbay, Ekmel

doi:10.1109/mnano.2019.2916113

Cited by 7 publications

(2 citation statements)

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“…Solar energy is regarded as the most promising and abundant renewable energy source on earth. Therefore, perfect broadband solar absorbers, which can efficiently harvest solar energy, exhibit the enormous application value in many areas, such as photocatalysis, − photodetection, − solar steam generators, − and solar thermophotovoltaics. − Various schemes for realizing broadband optical absorption have been proposed and demonstrated, such as a plane film stack and thick porous foams. , Recently, the advances in nanoscale manufacturing technology have resulted in the spring-up of metamaterial solar absorbers, which exhibit perfect electromagnetic response in the unique waveband. However, in a metamaterial structure, perfect absorption performance only happens within a narrowband range, which depends on its nanopattern design. − Up to now, considerable efforts have been made toward the implementation of broadband optical absorption with metamaterial broadband solar absorbers, including exciting multiple resonances using mixed-size or asymmetric nanostructures in the top metal layer, − replacing the metal layer by refractory materials with broadband intrinsic absorption − and utilizing semiconductor resonators and metafilms in the thin film structures. , …”

Section: Introductionmentioning

confidence: 99%

“…10−12 Various schemes for realizing broadband optical absorption have been proposed and demonstrated, such as a plane film stack and thick porous foams. 13,14 Recently, the advances in nanoscale manufacturing technology have resulted in the spring-up of metamaterial solar absorbers, which exhibit perfect electromagnetic response in the unique waveband. However, in a metamaterial structure, perfect absorption performance only happens within a narrowband range, which depends on its nanopattern design.…”

Section: ■ Introductionmentioning

confidence: 99%

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Enhanced Broadband Plasmonic Absorbers with Tunable Light Management on Flexible Tapered Metasurface

Hou

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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The growing attention in solar energy has motivated the development of highly efficient solar absorbers, and a metasurface absorber with broadband optical absorption is one of the main research interests. In this study, we developed an efficient metasurface absorber on a flexible film with a simple fabrication process. It consists of a polyimide nanocone substrate coated with gold and tungsten layers, exhibiting over 96% optical absorption in the visible range and a tunable absorption performance in the long wave range. From the analysis of experiment and simulation, the enhanced optical absorption is attributed to the synergistic effects of localized nanoparticle plasmon resonance and cavity plasmon resonance, and tunable light management comes from the strong infrared reflection of a gold layer and intrinsic absorption of variable tungsten layers. Meanwhile, the polarization-independent and omnidirectional optical absorption properties are demonstrated in the fabricated absorbers. Furthermore, this absorber shows the robustness against bending, maintaining the stable and excellent absorption performance after hundreds of bending tests. Our work offers a low-cost and straightforward tactic to design and fabricate flexible solar absorbers, and this metasurface absorber is a promising candidate for many exciting applications, such as emissivity control and flexible energy-related devices.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Broadband Plasmonic Absorbers with Tunable Light Management on Flexible Tapered Metasurface

Hou

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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Optical design and bandgap engineering in ultrathin multiple quantum well solar cell featuring photonic nanocavity

Meddeb,

Gehrke,

Vehse

2024

Progress in Photovoltaics

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Ultrathin solar cells are efficient and captivating devices with unique technological and scientific features in terms of minimal material consumption, fast fabrication processes, and good compatibility with semi‐transparent applications. Such photovoltaic (PV) technologies can enable effective synergy between optical and electronic confinements with large tuning capabilities of all the optoelectronic characteristics. In this work, the implications of the optical design and the bandgap engineering in ultrathin hydrogenated amorphous Si/Ge multiple quantum well (MQW) solar cells featuring photonic nanocavity are analyzed based on experimental measurements and optoelectronic modelling. By changing the period thicknesses and the positions of QWs inside the deep‐subwavelength nanophotonic resonator, the spatial and spectral distributions of the optical field and the local absorption are strongly affected. This leads to a modulation of the absorption resonance condition, the absorption edge and the resulting photocurrent outputs. Because of quantum confinement effect, the change of MQW configurations with different individual QW periods while keeping similar total thickness of about 20 nm alters both the bandgap energy and the band offset at the QW/barrier heterojunctions. This in turn controls the photovoltage as well as the carrier collection efficiency in solar cells. The highest open circuit voltage and fill factor values are achieved by employing MQW device configuration with 2.5 nm‐thin QWs. A record efficiency above 5.5% is reached for such emerging ultrathin Si/Ge MQW solar cell technology using thinner QWs with sufficient number, because of the optimum trade‐off between all the optoelectronic characteristic outputs. The presented design rules for opaque ultrathin solar cells with quantum‐confined nanostructures integrated in a photonic nanocavity can be generalized for the engineering of relevant multifunctional semitransparent PV devices.

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Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

Ghobadi

Karadaş

et al. 2019

Plasmonics

Self Cite

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In this paper, we demonstrate a highly efficient light trapping design that is made of a metal-oxide-semiconductor-semiconductor (nanograting/nanopatch) (MOSS g/p) four-layer design to absorb light in a broad wavelength regime in dimensions smaller than the hole diffusion length of the active layer. For this aim, we first adopt a modeling approach based on the transfer matrix method (TMM) to find out the absorption bandwidth (BW) limits of a simple hematite (α-Fe 2 O 3)-based metal-oxide-semiconductor (MOS) cavity design. Our modeling findings show that this design architecture can provide near-perfect absorption in shorter wavelengths. To extend the absorption toward longer wavelengths, a nanostructured semiconductor is placed on top of this MOS design. This nanostructure supports the Mie resonance and adds a new resonance in longer wavelengths without disrupting the lower wavelength absorption capability of MOS cavity. By this way, a polarization-insensitive absorption above 0.8 can be acquired up to λ=565 nm. Moreover, to have a better qualitative comparison, the water-splitting photocurrent of this design has been estimated. Our calculations show that a photocurrent as high as 10.6 mA cm −2 can be achieved with this design that is quite close to the theoretical limit of 12.5 mA cm −2 for hematite-based water-splitting photoanode. This paper proposes a design approach in which the superposition of cavity modes and Mie resonances can lead to a broadband, polarization-insensitive, and omnidirectional near-perfect light absorption in dimensions smaller than the carrier's diffusion length. This can be considered as a winning strategy to design highly efficient and ultrathin optoelectronic designs in a variety of applications including photoelectrochemical water splitting and photovoltaics.

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Strong Interference in Planar, Multilayer Perfect Absorbers: Achieving High-Operational Performances in Visible and Near-Infrared Regimes

Cited by 7 publications

References 124 publications

Enhanced Broadband Plasmonic Absorbers with Tunable Light Management on Flexible Tapered Metasurface

Enhanced Broadband Plasmonic Absorbers with Tunable Light Management on Flexible Tapered Metasurface

Optical design and bandgap engineering in ultrathin multiple quantum well solar cell featuring photonic nanocavity

Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

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