Improvement of PERC solar cell efficiency based on laser-doped selective emitter

Miao, Fengxiu; Zhang, Shude; Lian, Wei; Zhao, Baoxiu; Quan, Wei

doi:10.1063/1.5123838

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Current industrial cells opt for the approach of laser doping prior to dielectric deposition, combined with an aligned screen-printed fire-through metallization step [25]. A schematic of this structure is shown in Fig.…”

Section: A Current Industrial Approachmentioning

confidence: 99%

Review of Laser Doping and its Applications in Silicon Solar Cells

Vaqueiro-Contreras

Hallam

2023

IEEE J. Photovoltaics

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Laser-doped selective emitter diffusion techniques have become mainstream in solar cell manufacture covering 60% of the market share in 2022 and are expected to continue to grow to above 90% within the next five years (ITRPV). This was a very rapid uptake of technology, coming from only ∼10% penetration in 2018, and has enabled over 20 fA/cm 2 front recombination current reductions on the dominant passivated emitter and rear cell concepts in the same short period. In this article, a broad overview of key concepts in relation to laser doping methods relevant to solar cell manufacturing is given. We first discuss the basic mechanisms behind laser doping along with the benefits over conventional doping methods. The main laser doping approaches reported in the literature are then discussed, along with implications for metallization strategy, particularly in relation to selective emitter and back surface field formation in the dominant passivated emitter and rear cell technology. Different cell concepts that have benefited from the application of laser doping are also discussed. In the last section, we discuss the main defects induced by laser processing of silicon which affect the finished devices, potential and debated causes, as well as some commonly applied treatments for their mitigation.

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Section: A Current Industrial Approachmentioning

confidence: 99%

Review of Laser Doping and its Applications in Silicon Solar Cells

Vaqueiro-Contreras

Hallam

2023

IEEE J. Photovoltaics

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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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Investigation of laser doping on the formation of selective emitter solar cells

Meziani,

Moussi,

Chaouchi

et al. 2023

Preprint

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We investigated laser parameters for a laser doping (LD) process that enables to improve cell characteristics through the formation of a selective emitter (SE) multicrystalline silicon solar cell. In this work, the aim is the formation of SE with an investigation of the effect of critical LD parameters, such as laser power and laser speed. The LD 532 nm is used to obtain highly doped regions and deep doping depth that will receive the screen printed silver grid contact. The optimized laser power and speed of 80%, 500 mm/s, induced the activation of the phosphorus dopant and its diffusion in the silicon then leads to a local decrease of the emitter sheet resistance from 60 Ω/sqr to 30 Ω/sqr. Moreover, it was determined by SIMS and ECV measurements that the dopant concentration increased and the doping depth became deeper in the selective emitter formed by increasing laser power and/or laser speed. Fortunately, the surface cracks damage were not observed. The only damage caused by laser irradiation evidenced by debris and a melted surface. We have successfully developed SE p-type mc-Si 4 inch wafer produced by CRTSE solar cell with FF significantly improved of 1.01%. The conversion efficiency of solar cells with selective emitter formed by LD was increased. This gain is due to improved short-circuit current density and open-circuit voltage.

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Improvement of PERC solar cell efficiency based on laser-doped selective emitter

Cited by 3 publications

References 6 publications

Review of Laser Doping and its Applications in Silicon Solar Cells

Review of Laser Doping and its Applications in Silicon Solar Cells

Formation of Selective Emitter from Phosphorus Diffusion By Laser Doping Process

Investigation of laser doping on the formation of selective emitter solar cells

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