Antireflective scheme for InGaP/InGaAs/Ge triple junction solar cells based on TiO&lt;inf&gt;2&lt;/inf&gt; biomimetic structures

Hung, Kuo-Hsuan; Chen, Ting-Gang; Yang, Tung-Ting; Yu, Peichen; Hong, Chung-Yu; Wu, Yu–Rue; Chi, Guo-Chung

doi:10.1109/pvsc.2012.6318284

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…This is because of the similar mode coupling, light trapping, and waveguiding behaviors in inorganic solar cells. One example is that the TiO 2 nanotips [12] are originally proposed based on simulation with silicon solar cells, but later it can be applied to III-V solar cells equally well [29]. As a result, the inorganic semiconductor that is used as an example here to demonstrate the effectiveness of pattern design and optimization is not critical.…”

Section: (B) or 1(c)mentioning

confidence: 99%

Toward ultimate nanophotonic light trapping using pattern-designed quasi-guided mode excitations

Zhong

et al. 2015

J. Opt. Soc. Am. B

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In this work, a shape-optimized periodic pattern design is employed to boost the short circuit current of solar cells. A decent result of an additional 16.1% enhancement in short circuit current is achieved by solely patternwise optimization, compared to the baseline structure that is already under full parameter optimization. The underlying physics is that the shape-optimized pattern leads to optimal quasi-guided mode excitations. As a result of the pattern design, a single strongly confined quasi-guided mode is replaced with several weakly confined modes, to cover a broader spectral range. Previous works of optimized periodic gratings result in gradually varied grating heights and require grayscale lithography leading to high process complexity. Using randomized pattern for isotropic Lambertian light trapping, on the other hand, leads to an overly large simulation domain. The proposed pattern design methodology achieves the optimal balance between the slow-light enhancement strength and the enhancement spectral range for nanophotonic light trapping using quasi-guided modes.

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Section: (B) or 1(c)mentioning

confidence: 99%

Toward ultimate nanophotonic light trapping using pattern-designed quasi-guided mode excitations

Zhong

et al. 2015

J. Opt. Soc. Am. B

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show abstract

“…This is due to the similar mode coupling, light trapping, and waveguiding behaviors in inorganic solar cells. One example is that the TiO2 nanotips [5] are originally proposed based on simulation with silicon solar cells but later it can be applied to III-V solar cells equally well [19]. As a result, which inorganic semiconductor is used as an example to demonstrate the effectiveness of dielectric scatter ARCs is not critical.…”

Section: Calculation Set-up For Cylindrical Mie Scattering Arcmentioning

confidence: 99%

The versatile designs and optimizations for cylindrical TiO_2-based scatterers for solar cell anti-reflection coatings

Lin¹,

Zhong²,

Fu³

2013

Opt. Express

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The anti-reflection coating(ARC) based on dielectric nano-particles has been recently proposed as a new way to achieve the low reflectance required for solar cell front surfaces. In this scenario, the Mie modes associated with the dielectric nano-particles are utilized to facilitate photon forward scattering. In this work, versatile designs together with systematically optimized geometry are examined, for the ARCs based on dielectric scatterers. It is found that the Si3N4-TiO2 or SiO2-TiO2 stack is capable of providing low reflectance while maintaining a flat and passivated ARC-semiconductor interface which can be beneficial for reduced interface recombination and prevent V(OC) degradation associated with topography on the active materials. It is also confirmed that the plasmonic nano-particles placed at the front side of solar cells is not a preferred scheme, even with thorough geometrical optimization. At the ultimate design based on mixed graded index(GI) Mie-scattering, the averaged reflectance can be as low as 0.25%. Such a low reflectance is currently only achievable by ultra-long silicon nano-tips, but silicon nano-tips introduce severe surface recombination. On the other hand, the mixed GI Mie design preserves a flat and passivated ARC-silicon interface, with total thickness reduced to 279.8 nm, much thinner than 1.6 μm for silicon nanotips. In addition, the light trapping capability of mixed GI Mie design is much better than silicon nanotips. In fact, when compared to the state-of-art TiO2 light trapping anti-reflection coating, the mixed GI Mie design provides same light trapping capability while providing much lower reflectance.

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“…For Case 1, we look at the configuration where the uppermost aluminum indium phosphide (AlInP 2 ) "window" layer is thickened and patterned with nanostructures [17][18][19]. For Case 2, we look at the configuration where the nanostructures are placed into a low-absorption, high-index dielectric layer [20,21]. For Case 3, we look at the hybrid configuration where a nanostructured layer is integrated on top of an interference based ARC [22].…”

Section: Introductionmentioning

confidence: 99%

Design of antireflective nanostructures and optical coatings for next-generation multijunction photovoltaic devices

et al. 2014

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The successful development of multijunction photovoltaic devices with four or more subcells has placed additional importance on the design of high-quality broadband antireflection coatings. Antireflective nanostructures have shown promise for reducing reflection loss compared to the best thin-film interference coatings. However, material constraints make nanostructures difficult to integrate without introducing additional absorption or electrical losses. In this work, we compare the performance of various nanostructure configurations with that of an optimized multilayer antireflection coating. Transmission into a four-junction solar cell is computed for each antireflective design, and the corresponding cell efficiency is calculated. We find that the best performance is achieved with a hybrid configuration that combines nanostructures with a multilayer thin-film optical coating. This approach increases transmitted power into the top subcell by 1.3% over an optimal thin-film coating, corresponding to an increase of approximately 0.8% in the modeled cell efficiency.

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Antireflective scheme for InGaP/InGaAs/Ge triple junction solar cells based on TiO<inf>2</inf> biomimetic structures

Cited by 3 publications

References 3 publications

Toward ultimate nanophotonic light trapping using pattern-designed quasi-guided mode excitations

Toward ultimate nanophotonic light trapping using pattern-designed quasi-guided mode excitations

The versatile designs and optimizations for cylindrical TiO_2-based scatterers for solar cell anti-reflection coatings

Design of antireflective nanostructures and optical coatings for next-generation multijunction photovoltaic devices

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