Three-Layered Reflection-Reducing Coatings

Lockhart, L. B.; King, Peter

doi:10.1364/josa.37.000689

Cited by 39 publications

(9 citation statements)

References 2 publications

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“…For example, the loss mechanisms for incident solar photons include reflection, contact shadowing, a) absorption in barrier layers and by free-carriers, and transmission through the junction. Of these losses, reflection can be significantly reduced using anti-refection coatings 14 and textured surfaces, 4,15 contact shadowing can be minimized or eliminated by using transparent 16 or backside contacts, 17 and parasitic absorption can be minimized using widebandgap barriers and optimal doping profiles in the junction. Conversely, transmission losses are inherent to photovoltaic solar cells and strongly depend on the optical properties of the junction materials.…”

Section: Fundamental Loss Mechanisms In Solar Cellsmentioning

confidence: 99%

A semi-analytical model for semiconductor solar cells

Ding

Johnson

et al. 2011

Journal of Applied Physics

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A semi-analytical model is constructed for single- and multi-junction solar cells. This model incorporates the key performance aspects of practical devices, including nonradiative recombination, photon recycling within a given junction, spontaneous emission coupling between junctions, and non-step-like absorptance and emittance with below-bandgap tail absorption. Four typical planar structures with the combinations of a smooth/textured top surface and an absorbing/reflecting substrate (or backside surface) are investigated, through which the extracted power and four types of fundamental loss mechanisms, transmission, thermalization, spatial-relaxation, and recombination loss are analyzed for both single- and multi-junction solar cells. The below-bandgap tail absorption increases the short-circuit current but decreases the output and open-circuit voltage. Using a straightforward formulism this model provides the initial design parameters and the achievable efficiencies for both single- and multiple-junction solar cells over a wide range of material quality. The achievable efficiency limits calculated using the best reported materials and AM1.5 G one sun for GaAs and Si single-junction solar cells are, respectively, 27.4 and 21.1% for semiconductor slabs with a flat surface and a non-reflecting index-matched absorbing substrate, and 30.8 and 26.4% for semiconductor slabs with a textured surface and an ideal 100% reflecting backside surface. Two important design rules for both single- and multi-junction solar cells are established: i) the optimal junction thickness decreases and the optimal bandgap energy increases when nonradiative recombination increases; and ii) the optimal junction thickness increases and the optimal bandgap energy decreases for higher solar concentrations.

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Section: Fundamental Loss Mechanisms In Solar Cellsmentioning

confidence: 99%

A semi-analytical model for semiconductor solar cells

Ding

Johnson

et al. 2011

Journal of Applied Physics

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“…l/4-l/2-l/4) may be a better choice, as they can provide consistent high transmittances in a broad region and do not need material with very low refractive index. [21][22][23] The design concept of l/4-l/2-l/4 triple-layer interference lms was rst described and realized by Lockhart and King. 21 The obtained triple-layer AR coating afforded the substrate a constant low-reectance over the entire visible region.…”

Section: -5mentioning

confidence: 99%

“…[21][22][23] The design concept of l/4-l/2-l/4 triple-layer interference lms was rst described and realized by Lockhart and King. 21 The obtained triple-layer AR coating afforded the substrate a constant low-reectance over the entire visible region. Our group 23 optimized Lockhart's triple-layer AR coating by investigating the effect of refractive indices of three layers on broadband AR property.…”

Section: -5mentioning

confidence: 99%

Preparation of mechanically stable triple-layer interference broadband antireflective coatings with self-cleaning property by sol–gel technique

Yang

Xia

et al. 2017

RSC Adv.

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Antireflective coatings usually suffer from poor functional durability during outdoor service. The incorporation of additional properties, such as broadband antireflection, self-cleaning and mechanical stability, is of great importance. In the current work, we synthesized broadband AR coatings via the design concept of triple-layer interference coating. SiO 2 -TiO 2 , TiO 2 and nanoporous TiO 2 -SiO 2 composite thin films were employed as bottom, middle and top layers. Substrates (BK-7 glass) coated with the triple-layer films attained consistent high transmittances at 500-700 nm and the average transmittance at that region was 99.4%. The triple-layer films exhibited an outstanding superhydrophilic property with water contact angle of 2 in 0.5 s, and the superhydrophilicity could last for 30 days in the absence of UV illumination. These triple-layer coatings also showed a good ability to decompose organic substances under UV irradiation. The synergistic effect between superhydrophilicity and photocatalysis provides the films with self-cleaning effect. Meanwhile, the abrasion resistance test of the triple-layer films indicated favorable robustness and good adhesion of the films to substrates. This multifunctional film can have potential applications in various areas, like solar cell panels, green houses and architectural glasses.

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“…Some effort have been done with analytical models for the reflectance [17]. However, in these models the absorption of the materials are neglected as well as the effects due to deeper layers in the cell stack.…”

Section: B Arcmentioning

confidence: 99%

Modeling and parametric simulation of triple junction solar cell for space applications

Colasanti

Nesswetter

Zimmermann

et al. 2014

2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

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In this paper a calibrated model of a III-V triple junction solar cell is presented. The simulations are carried out with a commercial TCAD software, and the model is validated by a comparison of the EQE and IV curve with experimental data. We perform an extensive simulation study of the geometry of the solar cell and of its behavior under different light concentrations. A detailed optical model based on the Transfer Matrix Method (TMM) is used to investigate the optical behavior of the cell. Our analysis suggests that an optimum design of the Anti-Reflective Coating (ARC) is essential for significant performance improvement. The analysis under different light intensities shows that the series resistance is strictly related to the amount of light coming into the cell. A temperature analysis is performed showing results in a good agreement with the literature. To our knowledge there are no similar studies of these solar cells involving this type of advance physical modeling.

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Three-Layered Reflection-Reducing Coatings

Cited by 39 publications

References 2 publications

A semi-analytical model for semiconductor solar cells

A semi-analytical model for semiconductor solar cells

Preparation of mechanically stable triple-layer interference broadband antireflective coatings with self-cleaning property by sol–gel technique

Modeling and parametric simulation of triple junction solar cell for space applications

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