Observation of the enhanced infrared absorption of p-nitrobenzoate on Ag island films with an ATR technique

Hatta, A.; Ohshima, Tomoyuki; Suëtaka, Wataru

doi:10.1007/bf00632429

Cited by 114 publications

(60 citation statements)

References 7 publications

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“…We observed this in the rear TCO in silicon heterojunction solar cells; 11 it is also the principle behind metal overlayer-attenuated total reflection, an IR spectroscopic technique to enhance the absorption of ultrathin layers under investigation. 19,20 Most interesting for this study, F z (z) is near-zero at the metal surface; instead, F x (z), and to a lesser extent F y (z), is resonant with the metal.…”

Section: Resultsmentioning

confidence: 99%

Improving metal reflectors by suppressing surface plasmon polaritons: a priori calculation of the internal reflectance of a solar cell

2013

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Imperfect internal reflectance of near-bandgap light reduces the performance of all solar cells, and becomes increasingly detrimental as absorbers become thinner. We consider light incident on the silicon/dielectric/metal structure at the back of rear-passivated crystalline silicon solar cells with surface textures that are large enough for geometric optics. By calculating the absorbance in the metal as a function of the angle of incidence, we discover three results that are important for understanding and improving rear reflectors in many types of solar cells. First, significant parasitic absorption occurs in the metal layer in two cases: s-and p-polarized propagating modes (near-normal angles of incidence) when the dielectric thickness is adjusted to cause destructive interference of the reflected beams, and p-polarized evanescent modes (angles of incidence above the semiconductor/dielectric critical angle) that excite surface plasmon polaritons at the metal surface. Second, the latter loss dominates; a well-designed rear dielectric passivation layer must suppress the penetration of evanescent waves to the metal. Third, when used as an input in a simple analytical model, the average rear internal reflectance calculated by assuming a Lambertian angular distribution of light accurately predicts the total reflectance and absorbance of a solar cell. INTRODUCTIONThe current trend towards higher silicon solar cell efficiencies has brought rear-passivated designs-including PERC (passivated emitter and rear cell), 1 interdigitated back contact 2 and heterojunction 3 structures-to the forefront of both research and production. While the impetus for rear passivation is a reduction in surface recombination and a corresponding gain in open-circuit voltage (V oc ), the dielectric passivation layer (or transparent conductive oxide layer in silicon heterojunction cells) can be made to simultaneously serve an optical role, thus increasing short-circuit current density (J sc ) too. Several authors have observed that even high-conductivity metals like silver are poor reflectors on textured silicon solar cells, and that a dielectric buffer layer increases the rear internal reflectance of infrared (IR) light. 1,[4][5][6] In thin-film silicon solar cells that employ nanoscale textures and metallic rear reflectors, transparent conductive oxide (TCO) rear buffer layers suppress localized surface plasmons that are excited in the metal by the rough surfaces. 7-10 For alkaline-textured monocrystalline wafers with micrometer-sized pyramids, however, a different loss mechanism must be responsible for parasitic absorption in the metal. In optical simulations of planar Si/SiO 2 /Al structures, Campbell observed diminished internal reflectance both above and below the Si/SiO 2 critical angle for thin SiO 2 layers, revealing that evanescent as well as propagating modes may be absorbed in the metal. 4,5 In a recent

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Section: Resultsmentioning

confidence: 99%

Improving metal reflectors by suppressing surface plasmon polaritons: a priori calculation of the internal reflectance of a solar cell

2013

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“…Also, nanofilms with a random morphology and high surface roughness provide extremely high enhancement of optical absorption by molecular vibrations in a broad spectral range [13,14,[71][72][73][74]. This phenomenon has been known since the discovery of SEIRA in the early 1980s and has recently achieved worldwide success because the broadband plasmon resonance matches the absorption band of the molecular analytes.…”

Section: Optical Application Of Localized Surface Plasmon: Random Nanmentioning

confidence: 99%

Plasmons in nanoscale and atomic-scale systems

Nagao

Han

Hoang

et al. 2010

Science and Technology of Advanced Materials

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Plasmons in metallic nanomaterials exhibit very strong size and shape effects, and thus have recently gained considerable attention in nanotechnology, information technology, and life science. In this review, we overview the fundamental properties of plasmons in materials with various dimensionalities and discuss the optical functional properties of localized plasmon polaritons in nanometer-scale to atomic-scale objects. First, the pioneering works on plasmons by electron energy loss spectroscopy are briefly surveyed. Then, we discuss the effects of atomistic charge dynamics on the dispersion relation of propagating plasmon modes, such as those for planar crystal surface, atomic sheets and straight atomic wires. Finally, standing-wave plasmons, or antenna resonances of plasmon polariton, of some widely used nanometer-scale structures and atomic-scale wires (the smallest possible plasmonic building blocks) are exemplified along with their applications.

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“…The best-known example is surface-enhanced Raman scattering (SERS), in which the Raman scattering of molecules is enhanced by millions of times compared with free molecules [1,2,3,4]. A quite similar effect occurs in the mid-infrared region: molecules on metal surfaces show infrared absorption 10-1000 times more intense than would be expected from conventional measurements without the metal [5,6,7,8]. This effect is referred to as surface-enhanced infrared absorption (SEIRA) to emphasize the analogy to SERS.…”

Section: Introductionmentioning

confidence: 84%

Surface-Enhanced Infrared Absorption

Osawa

Topics in Applied Physics

342

283

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Abstract. Molecules adsorbed on metal island films or particles exhibit 10-1000 times more intense infrared absorption than would be expected from conventional measurements without the metal. This effect is referred to as surface-enhanced infrared absorption (SEIRA) to emphasize the similarities with surface-enhanced Raman scattering (SERS). The electromagnetic interactions of the incident photon field with the metal and molecules play predominant roles in this effect. The chemical interactions of the molecules with the surface can give additional enhancement. The enhancement mechanisms and some applications of SEIRA.

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Observation of the enhanced infrared absorption of p-nitrobenzoate on Ag island films with an ATR technique

Cited by 114 publications

References 7 publications

Improving metal reflectors by suppressing surface plasmon polaritons: a priori calculation of the internal reflectance of a solar cell

Improving metal reflectors by suppressing surface plasmon polaritons: a priori calculation of the internal reflectance of a solar cell

Plasmons in nanoscale and atomic-scale systems

Surface-Enhanced Infrared Absorption

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