Effects of Laser Pulse Overlap using Nanosecond Fiber Lasers for Structuring of AA6061-T6 Surfaces

Kittiboonanan, Phumipat; McWilliams, John; Taechamaneesatit, Polsin; Ratanavis, Amarin

doi:10.1007/s40516-023-00203-y

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Schnell et al [49] textured Ti6Al4V while changing pulse overlaps from 40 The groove changed from a smooth groove with a clear surface structure to a roug with many secondary features from excessive heating, such as cracks. Another st Ki iboonanan et al [50] showed similar surface textures after increasing puls from 10% to 90%. Their results also revealed that the features were enhanced an fied at a higher pulse overlap.…”

Section: Formation Mechanism Of Grooved and Near-isotropic Texturesmentioning

confidence: 86%

Surface Texturing and Wettability Modification by Nanosecond Pulse Laser Ablation of Stainless Steels

Dong,

Liu,

Pacella

2024

Coatings

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Laser surface texturing has attracted growing interest, particularly in functional surface modification. Lasers with nanosecond pulse widths and infrared wavelengths are commonly used for metallic surface texturing because of their low cost and potential for fabricating a large range of textures. In this research, a laser with a nanosecond pulse width and infrared wavelength was used for the surface texturing of 316 stainless steels. Standard grooved and near-isotropic surface textures, as well as novel porous texture and feather-like dendrite texture, were fabricated through single-time laser texturing. Water contact angle tests were performed on the post-process surfaces, and they showed wettability changes from superhydrophilic to superhydrophobic according to different types of textures. Discussion on the relationship between water contact angle and surface roughness, groove width/depth ratio, surface carbon and oxygen contents indicated that it is the surface morphology that impacts changes in wettability. The comprehensive formation mechanism of different textures and the wettability control mechanism through different textures have been systematically discussed. For the first time, the three-level (point-line-area) laser surface ablation mechanism has been established. The proposed findings can be used for future laser texturing process designs on metals using lasers with a nanosecond pulse width and an infrared wavelength for various applications including wettability modification.

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Section: Formation Mechanism Of Grooved and Near-isotropic Texturesmentioning

confidence: 86%

Surface Texturing and Wettability Modification by Nanosecond Pulse Laser Ablation of Stainless Steels

Dong,

Liu,

Pacella

2024

Coatings

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“…In the mass production process, we regulated the slight overlap of spots due to differential cooling rates between the spot's edge and its middle. Under high power conditions, micro-textures may manifest in the overlapping region [32], leading to a reduction in the minority carrier lifetime of the solar cell. We know that in the mass production process of n-TOPCon prepared using the low-pressure chemical vapor deposition (LPCVD) method, some manufacturers judge the thickness of poly silicon by the color of the front of the wafer after P atoms diffusion and annealing, because the mask layer deposited on different poly silicon thicknesses show different colors.…”

Section: Morphologies Analysismentioning

confidence: 99%

Performance of Large Area n-TOPCon Solar Cells with Selective Poly-Si Based Passivating Contacts Prepared by PECVD Method

Liu,

Guo,

Liu

et al. 2024

Materials

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Selective emitter (SE) technology significantly influences the passivation and contact properties of n-TOPCon solar cells. In this study, three mask layers (SiOx, SiNx, and SiOxNy) were employed to fabricate n-TOPCon solar cells with phosphorus (P)-SE structures on the rear side using a three-step method. Additionally, phosphosilicon glass (PSG) was used to prepare n-TOPCon solar cells with P-SE structure on the rear side using four-step method, and the comparative analysis of electrical properties were studied. The SiOx mask with a laser power of 20 W (O2 group) achieved the highest solar cell efficiency (Eff, 24.85%), The open-circuit voltage (Voc) is 2.4 mV higher than that of the H1 group, and the fill factor (FF) is 1.88% higher than that of the L1 group. Furthermore, the final Eff of solar cell is 0.17% higher than that of the L1 group and 0.20% higher than that of the H1 group. In contrast, using the four-step method and a laser power of 20 W (P2 group), a maximum Eff of 24.82% was achieved. Moreover, it exhibited an Voc, which is elevated by 3.2 mV compared to the H1 group, and FF increased by 1.49% compared to the L1 group. Furthermore, the overall Eff of the P2 group outperforms both the L1 and H1 groups by approximately 0.14% and 0.17%, respectively. In the four-step groups, the Eff of each laser condition group was improved compared with the L1 group and H1 group, The stability observed within the four-step method surpassed that of the three-step groups. However, in terms of full-scale electrical properties, the three-step method can achieve comparable results as those obtained from the four-step method. This research holds significant guiding implications for upgrading the n-TOPCon solar cell rear-side technology during mass production.

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Formation of Selective Emitter from Phosphorus Diffusion By Laser Doping Process

Meziani,

Moussi,

Chaouchi

et al. 2024

Silicon

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Effects of Laser Pulse Overlap using Nanosecond Fiber Lasers for Structuring of AA6061-T6 Surfaces

Cited by 6 publications

References 30 publications

Surface Texturing and Wettability Modification by Nanosecond Pulse Laser Ablation of Stainless Steels

Surface Texturing and Wettability Modification by Nanosecond Pulse Laser Ablation of Stainless Steels

Performance of Large Area n-TOPCon Solar Cells with Selective Poly-Si Based Passivating Contacts Prepared by PECVD Method

Formation of Selective Emitter from Phosphorus Diffusion By Laser Doping Process

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