Analysis of the influence of buffer layer on p-a-Si/n-c-Si heterojunction solar cells

Bai, XiaoYu; Guo, Qunchao; Liu, Qin; Pang, Huihua; Zhang, YingQing; Li, Hongbo

doi:10.1360/132012-1024

Cited by 2 publications

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“…The macroscopic properties of metallic hollow sphere structure can be adjusted by varying the hollow sphere dimension or joining technology. Examples for regulating the characteristics of the structures are mechanical [5][6][7][8], acoustical [9] and thermal [10,11] properties.…”

Section: Introductionmentioning

confidence: 99%

Laser drilling of hollow sphere structures

Riegel

Merkel

Öchsner

2014

Materialwissenschaft Werkst

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A special composite and cellular material – the metallic hollow sphere structure (MHSS) – represents an advanced material. The core element of the structure is a hollow sphere with a wall out of porous steel. This shell allows a high geometric reproducibility. It is an interesting base material for lightweight design. However, processing technologies for further manufacturing of metallic hollow sphere structure are necessary. Laser beam drilling is a highly efficient technique with heat input concentrated locally at the structure. Laser drilling is applied to metallic hollow sphere structures. The influence of different geometries and joining technologies of the spheres on the drilling behaviour is investigated. Percussion drilling is used to form holes with a CO2‐laser into the metallic hollow sphere structure. The investigated mean laser power is 400 W. Two different focal lenses with focal lengths of 5″ and 7.5″ allow investigations with different focal diameters and Rayleigh lengths. Diameter and roundness of the laser drilled holes are measured in five layers of different drill depths z. The maximum drilled depth is about 40 mm with a 5″ lense and about 50 mm with the f = 7.5″ lens. The relative roundness is determined and decreases with increasing drill depth. The diameter d(z) as a function of the drill depth follows the shape of an isophote, a line of constant intensity inside the laser beam. The brazed hollow sphere structures have considerably less drill depth than the sintered.

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Section: Introductionmentioning

confidence: 99%

Laser drilling of hollow sphere structures

Riegel

Merkel

Öchsner

2014

Materialwissenschaft Werkst

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“…[ 4,13 ] However, the challenge arises in the conventional SHPB test of a soft polymeric adhesive due to its low strength; the transmitted wave signal propagating in the output bar is so low that the noise can often prevent the interpretation of the transmitted signal. Viscoelastic bars [14][15][16] or a hollow output bar [ 17,18 ] has been used to modify the SHPB to test the low-impedance materials. However, it is diffi cult to accurately reconstruct the waves at the bar-specimen interfaces due to the wave attenuation and dispersion in the viscoelastic bars.…”

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confidence: 99%

Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives

Wang

2016

Macro Materials & Eng

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Predicting the impact performance of adhesively bonded structures requires the accurate characterization and constitutive formulation of the compressive behavior of the adhesive at dynamic strain rates. In this work, the stress–strain curves of Sikaflex adhesives are measured in uniaxial compression tests at quasi‐static and dynamic strain rates. The split‐Hopkinson pressure bar technique is modified with the hollow output bar to effectively characterize the dynamic response of the adhesive. It is found that the Sikaflex adhesive is incompressible and hyperelastic; the compressive behavior is significantly influenced by the strain rate. The strain rate sensitivity is not constant but varies as a function of the strain and the strain rate. The strain rate effect on compressive behavior is quantified and incorporated into the phenomenological hyperelastic constitutive model based on strain energy density. The modified constitutive equation accurately represents the strain rate dependent compressive behavior of Sikaflex adhesives.

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Analysis of the influence of buffer layer on p-a-Si/n-c-Si heterojunction solar cells

Cited by 2 publications

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Laser drilling of hollow sphere structures

Laser drilling of hollow sphere structures

Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives

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