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

Gangopadhyay, Utpal; Dhungel, Suresh Kumar; Kim, K; Manna, Uttam; Basu, Prabir K.; Kim, H J; Karunagaran, B.; Lee, K S; Yoo, Jinsu; Yi, Junsin

doi:10.1088/0268-1242/20/9/009

Cited by 55 publications

(12 citation statements)

References 18 publications

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“…The mc ‐Si wafer consists of a lot of millimeter‐sized single crystals of various grain orientations, and can also form the micrometer‐sized pyramid textures under an anisotropic alkali etching. However, the normal of pyramids (<100>) and etching rate of indivual single crystal depend on its oritentation, resulting in remarkably different microstuctures between mc ‐Si and sc ‐Si wafers (see Supporting Information S1) . Fortunately, the above results have shown that the nanosized pseudo‐pyramid texture can be formed on the surface of mc ‐Si wafers.…”

Section: Approach and Mechanism To Nanoscale Pseudo‐pyramid Textured mentioning

confidence: 86%

18.45%‐Efficient Multi‐Crystalline Silicon Solar Cells with Novel Nanoscale Pseudo‐Pyramid Texture

Zou

Chen

et al. 2014

Adv Funct Materials

107

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Silicon‐based cells could convert more solar energy to electrical energy if the cells could absorb more light. However, the nanostructured cells have demonstrated relatively low power conversion efficiency even when its reflection is very low; thus, they are still far from becoming real products of the photovoltaic industry. Here, nanoscale pseudo‐pyramid textured multi‐crystalline silicon (Pmc‐Si) solar cells, with the best efficiency of ≈18.45%, are fabricated by using a metal‐catalyzed chemical etching plus a post alkaline etching on an industrial production line. Such Pmc‐Si solar cells have showed similar light trapping ability as single crystalline silicon solar cells of micrometer pyramid texture, and the improved efficiency is mainly ascribed to its enhanced light absorption while the nanostructured surface still keeps acceptable passivation quality, that is, the short‐circuit current density has an increase of ≈300 mA cell–1, while the open‐circuit voltage has only a slight decrease of ≈1 mV. Further elevations of the efficiency are expected by optimizing both micrometer‐ and nanotextures, and exploring more effective passivation technique. More excitingly, the technique presented here has been verified in the production line for several batches as a real technique of low cost and high efficiency.

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Section: Approach and Mechanism To Nanoscale Pseudo‐pyramid Textured mentioning

confidence: 86%

18.45%‐Efficient Multi‐Crystalline Silicon Solar Cells with Novel Nanoscale Pseudo‐Pyramid Texture

Zou

Chen

et al. 2014

Adv Funct Materials

107

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“…Therefore, the (100)‐oriented grains have a dark appearance owing to the excellent light‐trapping ability of the upward pyramids, the (111)‐oriented grains appear shiny because of the strong light reflection of the nearly reclined pyramids, and the (110)‐oriented grains have a gray appearance because of the moderate light‐trapping ability of the tilted pyramids. The average reflection of the DRE mc‐Si wafer is more than 30%, and such high reflection loss is the main reason why alkali etching is incapable of texturing the mc‐Si wafer …”

Section: Resultsmentioning

confidence: 99%

Complementary etching behavior of alkali, metal‐catalyzed chemical, and post‐etching of multicrystalline silicon wafers

Zou

et al. 2019

Progress in Photovoltaics

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Both alkali and metal-catalyzed chemical etching (MCCE) of multicrystalline silicon (mc-Si) wafer show anisotropic etching behavior, resulting in different morphologies among the different grains. However, by combining alkali etching, MCCE, and a post-etching process, homogeneous microstructures can be obtained on the surface of mc-Si wafer. After the first alkali etching, there are three typical morphologies of upward pyramids, terraces, and tilt planes, and relative to the initial Si(100), Si(110), and Si(111) dominated grains, these show low, moderate, and high reflection, respectively. After MCCE and the post-etching process, the microstructures on the different grains have converged to a similar morphology and reflection. Mc-Si solar cells fabricated by complementary alkali etching, MCCE, and post-etching have a good appearance and high efficiency of~19.4%. Moreover, the cells with submicrometer texture have the advantages of reverse current-voltage characteristics and weak light response over traditional cells with micrometer texture. KEYWORDS alkali etching, complementary etching behavior, metal-catalyzed chemical etching, multicrystalline silicon solar cell, power conversion efficiency

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“…By changing deposition conditions, the optical properties of DLN film can be varied over a wide range. The substrates used were boron doped NaOH-NaOCl polished multicrystalline silicon (mcSi) wafers [8].…”

Section: Methodsmentioning

confidence: 99%

Antireflective Nanocomposite Based Coating on Crystalline Silicon Solar Cells for Building-Integrated Photovoltaic Systems

Gangopadhyay

Jana

Das

et al. 2013

Conference Papers in Energy

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Building-integrated photovoltaic (BIPV) systems represent an interesting, alternative approach for increasing the available area for electricity production and potentially for further reducing the cost of solar electricity. In BIPV systems, the visual impression of a solar module becomes important, including its color. However, the range of solar cell colours and shapes currently on offer to architects and BIPV system designers is still very limited, and this is a barrier to the widespread use of PV modules as a constructional "material. " The color of a solar module is determined by the color of the cells in the module, which is given by the antireflection coating (ARC). However, access to efficient, but differently colored, solar cells is important for the further development of BIPV systems. In this paper, we have used Diamond-like nanocomposite layer as an Antireflective Nanocomposite based (ARNAB) coating material for crystalline silicon solar cell, and the impact of varying the color of an ARC upon the optical characteristics and efficiency of a solar cell is investigated. In addition to a comparison of the optical characteristics of such solar cells, the effect of using colored ARCs on solar cell efficiency is quantified using the solar cell modeling tool PC1D.

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

Cited by 55 publications

References 18 publications

18.45%‐Efficient Multi‐Crystalline Silicon Solar Cells with Novel Nanoscale Pseudo‐Pyramid Texture

18.45%‐Efficient Multi‐Crystalline Silicon Solar Cells with Novel Nanoscale Pseudo‐Pyramid Texture

Complementary etching behavior of alkali, metal‐catalyzed chemical, and post‐etching of multicrystalline silicon wafers

Antireflective Nanocomposite Based Coating on Crystalline Silicon Solar Cells for Building-Integrated Photovoltaic Systems

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