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Transmission enhancement based on strong interference in metal-semiconductor layered film for energy harvesting.

Li Q, Du K, Mao K, Fang X, Zhao D, Ye H, Qiu M - Sci Rep (2016)

Bottom Line: In a metallic film coated with a thin semiconductor film, both transmission and absorption are simultaneously enhanced as a result of dramatically reduced reflection.These planar layered films for transmission enhancement feature ultrathin thickness, broadband and wide-angle operation, and reduced resistance.This strategy relies on no patterned nanostructures and thereby may power up a wide spectrum of energy-harvesting applications such as thin-film photovoltaics and surface photocatalysis.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ABSTRACT
A fundamental strategy to enhance optical transmission through a continuous metallic film based on strong interference dominated by interface phase shift is developed. In a metallic film coated with a thin semiconductor film, both transmission and absorption are simultaneously enhanced as a result of dramatically reduced reflection. For a 50-nm-thick Ag film, experimental transmission enhancement factors of 4.5 and 9.5 are realized by exploiting Ag/Si non-symmetric and Si/Ag/Si symmetric geometries, respectively. These planar layered films for transmission enhancement feature ultrathin thickness, broadband and wide-angle operation, and reduced resistance. Considering one of their potential applications as transparent metal electrodes in solar cells, a calculated 182% enhancement in the total transmission efficiency relative to a single metallic film is expected. This strategy relies on no patterned nanostructures and thereby may power up a wide spectrum of energy-harvesting applications such as thin-film photovoltaics and surface photocatalysis.

No MeSH data available.


Related in: MedlinePlus

The measured angle resolved enhanced transmission spectra for both (a) Ag/Si (30/15 nm) double-layered and (b) Si/Ag/Si (15/30/15 nm) triple-layered films. The incident angles are 0°, 15°, 30°, 45° and 60° under the non-polarized light illumination.
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f6: The measured angle resolved enhanced transmission spectra for both (a) Ag/Si (30/15 nm) double-layered and (b) Si/Ag/Si (15/30/15 nm) triple-layered films. The incident angles are 0°, 15°, 30°, 45° and 60° under the non-polarized light illumination.

Mentions: To show the robustness of enhanced optical transmission of the proposed structures to oblique incidence, the measured angular resolved transmission spectra of two typical films (asymmetric Ag/Si (30/15 nm) and symmetric Si/Ag/Si (15/30/15 nm) films) for non-polarized light are provided in Fig. 6. For both films, the peak transmission is almost unaltered when the incident angle is increased to 30°. When the incident angle is increased to 45°, the peak transmission is only decreased by 5%. The robustness of enhanced optical transmission to the oblique incidence results from significantly suppressed propagation phase shift in the ultrathin Si layer. This is in sheer contrast to conventional λ/4 thickness film where the propagation phase shift dominates and thereby the enhanced transmission is sensitive to the incident angle.


Transmission enhancement based on strong interference in metal-semiconductor layered film for energy harvesting.

Li Q, Du K, Mao K, Fang X, Zhao D, Ye H, Qiu M - Sci Rep (2016)

The measured angle resolved enhanced transmission spectra for both (a) Ag/Si (30/15 nm) double-layered and (b) Si/Ag/Si (15/30/15 nm) triple-layered films. The incident angles are 0°, 15°, 30°, 45° and 60° under the non-polarized light illumination.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940859&req=5

f6: The measured angle resolved enhanced transmission spectra for both (a) Ag/Si (30/15 nm) double-layered and (b) Si/Ag/Si (15/30/15 nm) triple-layered films. The incident angles are 0°, 15°, 30°, 45° and 60° under the non-polarized light illumination.
Mentions: To show the robustness of enhanced optical transmission of the proposed structures to oblique incidence, the measured angular resolved transmission spectra of two typical films (asymmetric Ag/Si (30/15 nm) and symmetric Si/Ag/Si (15/30/15 nm) films) for non-polarized light are provided in Fig. 6. For both films, the peak transmission is almost unaltered when the incident angle is increased to 30°. When the incident angle is increased to 45°, the peak transmission is only decreased by 5%. The robustness of enhanced optical transmission to the oblique incidence results from significantly suppressed propagation phase shift in the ultrathin Si layer. This is in sheer contrast to conventional λ/4 thickness film where the propagation phase shift dominates and thereby the enhanced transmission is sensitive to the incident angle.

Bottom Line: In a metallic film coated with a thin semiconductor film, both transmission and absorption are simultaneously enhanced as a result of dramatically reduced reflection.These planar layered films for transmission enhancement feature ultrathin thickness, broadband and wide-angle operation, and reduced resistance.This strategy relies on no patterned nanostructures and thereby may power up a wide spectrum of energy-harvesting applications such as thin-film photovoltaics and surface photocatalysis.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ABSTRACT
A fundamental strategy to enhance optical transmission through a continuous metallic film based on strong interference dominated by interface phase shift is developed. In a metallic film coated with a thin semiconductor film, both transmission and absorption are simultaneously enhanced as a result of dramatically reduced reflection. For a 50-nm-thick Ag film, experimental transmission enhancement factors of 4.5 and 9.5 are realized by exploiting Ag/Si non-symmetric and Si/Ag/Si symmetric geometries, respectively. These planar layered films for transmission enhancement feature ultrathin thickness, broadband and wide-angle operation, and reduced resistance. Considering one of their potential applications as transparent metal electrodes in solar cells, a calculated 182% enhancement in the total transmission efficiency relative to a single metallic film is expected. This strategy relies on no patterned nanostructures and thereby may power up a wide spectrum of energy-harvesting applications such as thin-film photovoltaics and surface photocatalysis.

No MeSH data available.


Related in: MedlinePlus