Design and mechanism of cost-effective and highly efficient ultrathin (&amp;lt; 0.5 μm) GaAs solar cells employing nano/micro-hemisphere surface texturing

Li, J. S.; Li, Y. L.; He, Deyan; Yu, Hao; Yan, Xingbin

doi:10.1063/1.4799731

Cited by 8 publications

(1 citation statement)

References 32 publications

(33 reference statements)

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“…Li et al showed that high absorption of light (>90%) is possible by employing low aspect ratio 3D hemispherical micro features on GaAs solar cells. 16 Numerical investigations showed that local heat transfer increases greatly by employing 3D hemispherical micro features on the surface. 17…”

Section: Introductionmentioning

confidence: 99%

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

Roy

Balasubramaniam

2019

Journal of Micromanufacturing

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Non-conformal reverse micro electrical discharge machining (NC-RMEDM) is a variant of conventional RMEDM developed by the present authors wherein modification in the tool is carried out to generate different shapes of micro features. In this study, the effect of various factors like flat bottom and taper bottom hole, inversing the position of tool and workpiece and changing the hole depth have been experimentally investigated to determine the optimal combination required for generating hemispherical shaped micro features. It was found that hemispherical shaped micro feature can be generated by employing tapered bottom blind hole as tool. Buoyancy assisted machining (BAM) with traverse of workpiece (anode) downwards into the tool (cathode) and vice versa, i.e., buoyancy opposed machining (BOM) with traverse of tool downwards into the workpiece were carried out to study the generation of hemispherical micro feature based on inversion of electrode positions. Although both BAM and BOM generated hemispherical shaped feature, BAM is preferred due to reduced machining time as opposed to BOM. Also, increasing the hole depths led to altering the shape of micro feature from hemispherical to cylindrical with hemispherical end and coni-spherical end. An array of hemispherical micro features was fabricated based on the finding from this study, and surface roughness analysis was carried out which showed that irrespective of the position of micro feature on the array, surface roughness at the tip and base of the micro feature is lower as compared to side portion.

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Section: Introductionmentioning

confidence: 99%

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

Roy

Balasubramaniam

2019

Journal of Micromanufacturing

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Design of Quadruple‐Layer Antireflection Coating for AlGaInP/AlGaAs/GaAs Three‐Junction Solar Cell

Zhang¹,

Li²,

Lu³

et al. 2022

Energy Tech

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A combination of AlGaInP/AlGaAs/GaAs is commonly used in world‐record five‐ and six‐junction solar cells for their easily tunable bandgap and nearly matched lattice constants. Wide‐range low reflectivity is of significant importance in this three‐junction solar cell (3JSC), but also difficult to achieve particularly in 300–400 nm due to the optical properties of III–V alloys. Therefore, quadruple‐layer antireflection coatings (QLAR) composed of ZnS and MgF2 films are studied in this article for both performance and practicability. Optical constants of ZnS and MgF2 films are extracted by variable angle spectroscopic ellipsometry. 150 °C is determined as the best deposition temperature to decrease parasitic absorption in ZnS films. The antireflection coating is designed by the transfer‐matrix method considering both low reflectivity in a wide range of 300–900 nm and balanced subcell current density. Fabricated 3JSC with optimized MgF2/ZnS/MgF2/ZnS QLAR is demonstrated to possess low reflection losses in a broadband spectral range, with an average of only 1.59% in 300–900 nm. This boosts the integral current density to 11.58, 11.35, and 11.25 mA cm−2 for AlGaInP, AlGaAs, and GaAs subcells, respectively.

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Numerical modelling, simulation and fabrication of 3-D hemi-spherical convex micro features using Reverse Micro EDM

Roy

Datta

Balasubramaniam

2018

Journal of Manufacturing Processes

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Design and mechanism of cost-effective and highly efficient ultrathin (< 0.5 μm) GaAs solar cells employing nano/micro-hemisphere surface texturing

Cited by 8 publications

References 32 publications

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

Design of Quadruple‐Layer Antireflection Coating for AlGaInP/AlGaAs/GaAs Three‐Junction Solar Cell

Numerical modelling, simulation and fabrication of 3-D hemi-spherical convex micro features using Reverse Micro EDM

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