Yablonovitch limit in light trapping

E379712

The Yablonovitch limit in light trapping is a fundamental theoretical bound that defines the maximum enhancement of optical path length—and thus light absorption—achievable in a dielectric material using scattering and texturing.

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Predicate Object
instanceOf optical principle
physical law
theoretical limit
appliesTo dielectric materials
planar solar cells with surface texturing
thin-film solar cells
weakly absorbing media
assumes geometrical optics regime
isotropic internal scattering
no parasitic absorption in non-active layers
randomizing surface texture
basedOn Lambertian scattering assumption
statistical ray optics
category light trapping theory
constrains design of light-trapping textures
maximum achievable short-circuit current in solar cells
contrastsWith single-pass absorption without texturing
defines maximum light trapping enhancement in a dielectric
maximum optical path length enhancement by scattering and texturing
field optics
photonics
semiconductor physics
solar cell physics
hasExtension nanophotonic light trapping beyond ray optics
wave-optics-based light trapping limits
historicalPeriod early 1980s
late 1970s
implies absorption cannot be enhanced arbitrarily by texturing alone
there is a fundamental upper bound on light trapping in isotropic media
influenced design rules for high-index absorbers
development of textured solar cell surfaces
research on nanophotonic light trapping
maximumEnhancementFactor 4n^2
namedAfter Eli Yablonovitch
originatesFrom detailed balance considerations
thermodynamic arguments
relatedConcept Lambertian reflectance law in optics
surface form: Lambertian surface

Shockley–Queisser limit
escape probability of photons
photon recycling
relatesTo escape cone of light in a dielectric
light absorption enhancement
optical path length enhancement
refractive index of the medium
states maximum path length enhancement factor is 4n^2
usedIn design of high-efficiency solar cells
evaluation of light trapping schemes
optimization of thin absorber layers
where n is the refractive index of the absorbing medium

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Eli Yablonovitch knownFor Yablonovitch limit in light trapping