Large-area omnidirectional antireflection coating on low-index materials

Li, Ping-Chun; Yu, E. T.

doi:10.1364/josab.30.002584

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…In these cases, the planar PET sheet shows slightly lower transmittance compared to moth‐eye textured PET sheets at incident angles < 60°, and slightly higher transmittance at incident angles > 60°. In principle, an optimal graded‐refractive index structure will yield the best performance ; however, the optimal structures often require large ratios of height to diameter to assure a sufficiently smooth, gradual change in refractive index, which is extremely challenging in terms of fabrication. We therefore compare the transmittance characteristics of these moth‐eye structures within a physically attainable range of heights.…”

Section: Resultsmentioning

confidence: 99%

“…Although these structures can exhibit good broadband and omnidirectional antireflection performance, surface and near‐surface material defects are typically introduced in etching processes, potentially resulting in reduced carrier collection efficiency, and in most cases an additional passivation layer is required to reduce photo‐generated carrier recombination at these defects. On the other hand, subwavelength nanostructures on materials with low refractive indices are of great interest because of their wide usage as packaging materials in photovoltaic or display applications . However, the fabrication of subwavelength nanostructures with sufficiently high aspect ratios and mechanical stability on materials with low refractive indices is still challenging.…”

Section: Introductionmentioning

confidence: 99%

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Subwavelength nanostructures integrated with polymer‐packaged iii–v solar cells for omnidirectional, broad‐spectrum improvement of photovoltaic performance

et al. 2014

Progress in Photovoltaics

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Reduction in surface and interface reflectance via the integration of subwavelength nanostructures in flexible polymer packaging material combined with incorporation of dielectric nanoislands into a conventional two-layer antireflection coating has been demonstrated, analyzed and optimized. Transmittance measurements of moth-eye textured polymer packaging sheets with different tapered pillar heights fabricated by reactive-ion etching and nanosphere lithography provide insights into the choice of the optimum nanostructure dimensions. Detailed computational modeling and simulations elucidate the physical nature of the antireflection performance of dielectric nanoisland structures integrated with a commercial two-layer antireflection coating, and provide guidance for design of the nanoisland structure for optimum antireflection performance. Measurements show that the integration of appropriately designed nanostructures in both polymer packaging material and conventional antireflection layers enables substantial increases in external quantum efficiency (E.Q.E.) and short-circuit current density (J sc ) over a broad range of incident angles, compared to structures with conventional bilayer antireflection coatings and unpatterned polymer packaging sheets. A 1.1× increase in J sc , derived directly from E.Q.E. measurements, at normal incidence, increasing to 1.67× improvement at 80°angle of incidence, suggests that such an approach is promising for a variety of photovoltaic applications, particularly those where solar tracking is not feasible or practical.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subwavelength nanostructures integrated with polymer‐packaged iii–v solar cells for omnidirectional, broad‐spectrum improvement of photovoltaic performance

et al. 2014

Progress in Photovoltaics

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“…In many applications such as solar cells and photodetectors, such a reflection is detrimental to the system performance and thus an effective antireflection strategy is required. A standard approach includes single-or multi-layer interference [1][2][3][4][5][6], and adiabatic optical impedance matching [7][8][9][10][11][12][13][14][15][16][17], frequently at the nanoscale [18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Sufficient condition for perfect antireflection by optical resonance at dielectric interface

Wang

Sandhu

et al. 2015

SPIE Proceedings

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Reflection occurs at an air-material interface. The development of antireflection schemes, which aims to cancel such reflection, is important for a wide variety of applications including solar cells and photodetectors. Recently, it has been demonstrated that a periodic array of resonant subwavelength objects placed at an air-material interface can significantly reduce reflection that otherwise would have occurred at such an interface. Here, we introduce the theoretical condition for complete reflection cancellation in this resonant antireflection scheme. Using both general theoretical arguments and analytical temporal coupled-mode theory formalisms, we show that in order to achieve perfect resonant antireflection, the periodicity of the array needs to be smaller than the free-space wavelength of the incident light for normal incidence, and also the resonances in the subwavelength objects need to radiate into air and the dielectric material in a balanced fashion. Our theory is validated using first-principles full-field electromagnetic simulations of structures operating in the infrared wavelength ranges. For solar cell or photodetector applications, resonant antireflection has the potential of providing a low-cost technique for antireflection that does not require nanofabrication into the absorber materials, which may introduce detrimental effects such as additional surface recombination. Our work here provides theoretical guidance for the practical design of such resonant antireflection schemes.

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“…In many applications, for example, solar cells and photodetectors, such a reflection is detrimental to system performance and thus an effective antireflection strategy is required. A standard approach includes single-or multi-layer interference [1][2][3][4][5][6], and adiabatic optical impedance matching [7][8][9][10][11][12][13][14][15][16], frequently at the nanoscale [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Condition for perfect antireflection by optical resonance at material interface

Wang¹,

Yu²,

Sandhu³

et al. 2014

Optica

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Reflection occurs at an air-material interface. The development of antireflection schemes, which aims to cancel such reflection, is important for a wide variety of applications including solar cells and photodetectors. Recently, it has been demonstrated that a periodic array of resonant subwavelength objects placed at an air-material interface can significantly reduce reflection that otherwise would have occurred at such an interface. Here, we introduce the theoretical condition for complete reflection cancellation in this resonant antireflection scheme. Using both general theoretical arguments and analytical temporal coupled-mode theory formalisms, we show that in order to achieve perfect resonant antireflection, the periodicity of the array needs to be smaller than the free-space wavelength of the incident light for normal incidence, and also the resonances in the subwavelength objects need to radiate into air and the dielectric material in a balanced fashion. Our theory is validated using first-principles full-field electromagnetic simulations of structures operating in the infrared wavelength ranges. For solar cell or photodetector applications, resonant antireflection has the potential for providing a low-cost technique for antireflection that does not require nanofabrication into the absorber materials, which may introduce detrimental effects such as additional surface recombination. Our work here provides theoretical guidance for the practical design of such resonant antireflection schemes.

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Large-area omnidirectional antireflection coating on low-index materials

Cited by 10 publications

References 28 publications

Subwavelength nanostructures integrated with polymer‐packaged iii–v solar cells for omnidirectional, broad‐spectrum improvement of photovoltaic performance

Subwavelength nanostructures integrated with polymer‐packaged iii–v solar cells for omnidirectional, broad‐spectrum improvement of photovoltaic performance

Sufficient condition for perfect antireflection by optical resonance at dielectric interface

Condition for perfect antireflection by optical resonance at material interface

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