Advantages of textured multicrystalline silicon for MIS inversion layer solar cells

Hezel, Rudolf; Hu, Liqiong

doi:10.1016/0165-1633(91)90124-4

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…For monocrystalline silicon, different kinds of alkaline etchants were used to form pyramidal structure [1][2][3][4]. However, for cast mc−Si, although many etchants have been investigated, controversial results have been reported [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Texturization of cast multicrystalline silicon for solar cells

Yang

et al. 2004

Semicond. Sci. Technol.

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The texturization of cast multicrystalline silicon (mc-Si) for solar cells with alkaline or acidic solution has been investigated, and two theoretical models were built on the basis of surface morphologies. For alkaline etching, tilted pyramid structure could be formed on the surface. It is reported that when the tilted angle, which is the angle between (100)-plane and as-cut surface, is larger than the critical angle (20 • ), the reflectance rapidly increases with the deviation from 100 orientation. For acidic etching, spherical structure was generated. If the ratio, which is the ratio of depth (h) and radius (r) of the spherical structure, is less than the critical value (0.29), the second reflection cannot take place. Therefore, improving the ratio of i and r is one effective way to decrease the reflectance of cast mc-Si, which was proved by subsequent experiment. With the addition of sodium nitrite (NaNO 2 ) or sodium phosphate tribasic (Na 3 PO 4 •12H 2 O) into the acid etchant, it was found that the reflectance decreased remarkably. Finally the formation mechanism of spherical pits in acid etched mc-Si was discussed.

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Section: Introductionmentioning

confidence: 99%

“…Hezel and Hu [5] applied potassium carbonate (K 2 CO 3 ) solution to texture mc-Si and tilted pyramidal structure was formed. Compared with the polished surface, this structure had lower reflectance.…”

Section: Introductionmentioning

confidence: 99%

Texturization of cast multicrystalline silicon for solar cells

Yang

et al. 2004

Semicond. Sci. Technol.

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“…Tsujino et al [ 25 ] used metallic catalysts for acid texturization. Hazeland and Hu [ 26 ] formed a titled pyramidal structure by using potassium carbonate, which shows a lower reflectance compared to polished surfaces. Campbell et al [ 27 ] suggested that top surface reflection could be eliminated by using a tilted pyramidal structure.…”

Section: Introductionmentioning

confidence: 99%

Paraboloid Structured Silicon Surface for Enhanced Light Absorption: Experimental and Simulative Investigations

et al. 2015

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In this paper, we present an optical model that simulates the light trapping and scattering effects of a paraboloid texture surface first time. This model was experimentally verified by measuring the reflectance values of the periodically textured silicon (Si) surface with the shape of a paraboloid under different conditions. A paraboloid texture surface was obtained by electrochemical etching Si in the solution of hydrofluoric acid, dimethylsulfoxide (DMSO), and deionized (DI) water. The paraboloid texture surface has the advantage of giving a lower reflectance value than the hemispherical, random pyramidal, and regular pyramidal texture surfaces. In the case of parabola, the light can be concentrated in the direction of the Si surface compared to the hemispherical, random pyramidal, and regular pyramidal textured surfaces. Furthermore, in a paraboloid textured surface, there can be a maximum value of 4 or even more by anisotropic etching duration compared to the hemispherical or pyramidal textured surfaces which have a maximum h/D (depth and diameter of the texture) value of 0.5. The reflectance values were found to be strongly dependent on the h/D ratio of the texture surface. The measured reflectance values were well matched with the simulated ones. The minimum reflectance value of ~4 % was obtained at a wavelength of 600 nm for an h/D ratio of 3.75. The simulation results showed that the reflectance value for the h/D ratio can be reduced to ~0.5 % by reducing the separations among the textures. This periodic paraboloidal structure can be applied to the surface texturing technique by substituting with a conventional pyramid textured surface or moth-eye antireflection coating.

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“…Other methods such as mechanical grooving, laser texturing and reactive ion etching had also drawn the attention of the researchers in the past but none of them could establish themselves as a simple and low cost candidate for industrial production of multi-crystalline silicon solar cells. Hezel and Hu [5] used a potassium carbonate (K 2 CO 3 ) solution to texture mc-Si with which a tilted pyramidal structure was obtained. Such a surface showed lower reflectance compared to the polished surface.…”

Section: Introductionmentioning

confidence: 99%

Novel low cost chemical texturing for very large area industrial multi-crystalline silicon solar cells

Gangopadhyay¹,

Dhungel

Kim

et al. 2005

Semicond. Sci. Technol.

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Multi-crystalline silicon surface etching without grain-boundary delineation is a challenging task for the fabrication of high efficiency solar cells. The use of sodium hydroxide-sodium hypochlorite (NaOH-NaOCl) solution for texturing a multi-crystalline silicon wafer surface in a solar cell fabrication line is reported in this paper. The optimized etching solution of NaOH-NaOCl does not have any effect on multi-crystalline silicon grain boundaries and it also has excellent isotropic etch characteristics, which ultimately helps to achieve higher values of performance parameters, especially the open circuit voltage (V oc ) and fill factor (FF), than those in the case of conventional silicon texturing. Easy control over the reaction of the NaOH-NaOCl solution is also one of the major advantages due to which sophistication in controlling the temperature of the etching bath is not required for the industrial batch process. The FTIR analysis of the silicon surface after etching with the current approach shows the formation of Si-Cl bonds, which improves the quality of the diffused junction due to chlorine gettering during diffusion. We are the first to report 14-14.5% efficiency of very large area (150 mm × 150 mm) multi-crystalline silicon solar cells using a NaOH-NaOCl texturing approach in an industrial production line with a yield greater than 95%.

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Advantages of textured multicrystalline silicon for MIS inversion layer solar cells

Cited by 4 publications

References 8 publications

Texturization of cast multicrystalline silicon for solar cells

Texturization of cast multicrystalline silicon for solar cells

Paraboloid Structured Silicon Surface for Enhanced Light Absorption: Experimental and Simulative Investigations

Novel low cost chemical texturing for very large area industrial multi-crystalline silicon solar cells

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