Low cost multicrystalline bifacial PERC solar cells – Fabrication and thermal improvement

Chen, Wen‐Hao; Liu, Renzhong; Zeng, Qingguo; Zhou, Lang

doi:10.1016/j.solener.2019.04.033

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…As the temperature further rises, the Al-Si alloy liquid phase and the proportion of silicon element in the liquid phase both increase. In the process of forming Al-Si liquid phase, Si and Al thermal are diffused into each other, Si migrated rapidly in the Al layer, and Al is doped in the Si matrix [9,10]. In the process of cooling, the thermal diffusion of Al and the recrystallization of Si jointly formed a heavily doped P + layer.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Particle-Sized Al Powders on Sintering Properties of Aluminum Paste in Crystalline Silicon Solar Cell

Zhu

Yang

Chen

2022

International Journal of Photoenergy

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In this paper, the effects of particle size difference of aluminum (Al) powder on physical properties of Al powder and sintering properties of Al paste were investigated. For this purpose, respectively, Al powders with four mean particle sizes were used, which were obtained by two classifications using the same nitrogen atomization process. Thermal analysis results showed that the smaller the Al particle size, the lower the oxidation temperature and the higher the reaction enthalpy, indicating higher reactivity of the Al powder. Four Al powders were prepared into Al paste by the same process, and the resistances of the paste increased with the decrease of the particle size of the aluminum powder. Electrochemical capacitance-voltage profiler (ECV) and scanning electron microscope (SEM) analysis showed that the smaller the Al particle size, the thicker the back surface field (BSF) and the higher the doping concentration of BSF. It was found that the smaller size of Al powder limited the migration of silicon, which resulted in higher concentration of silicon (Si) in the Al-Si liquid phase. This leads to reaching a balance at a higher temperature between the recrystallization of silicon from the alloy liquid and the dissolution of silicon in the liquid alloy and a higher doping concentration and a higher effective BSF doping thickness. Results of the study will provide reference for further study and application of Al paste.

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Section: Introductionmentioning

confidence: 99%

Effects of Different Particle-Sized Al Powders on Sintering Properties of Aluminum Paste in Crystalline Silicon Solar Cell

Zhu

Yang

Chen

2022

International Journal of Photoenergy

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“…To achieve this target, it is essential to keep on lowering the Levelized Costs of Electricity (LCoE) of PV, that has already demonstrated to be even lower than most of the electricity generation alternatives, either renewables or fossil (Kost et al, 2018). The increasing efficiency of solar cells (for the passivated emitter and rear cell, (PERC) (Altermatt et al, 2018), heterojunction (SHJ), and the tunnel oxide passivated contact (TOPCon) (Zeng et al, 2017) technologies) and modules (with half cells, bifacial structures (Chen et al, 2019), etc.) is contributing to further decreasing of LCoE.…”

Section: Introductionmentioning

confidence: 99%

UMG silicon for solar PV: From defects detection to PV module degradation

Forniés¹,

Cañizo

Rouco³

et al. 2021

Solar Energy

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“…Ali et al evaluated the influence of nanosecond (ns) and femtosecond (fs) laser sources, indicating that the nanosecond laser ablation process is linear throughout without obvious texture damage. [ 25 ] Meanwhile, laser damage and contact opening, [ 26–28 ] finger design, [ 29,30 ] sintering temperature, and aluminum paste [ 31,32 ] are also investigated and optimized for better rear‐side passivation and ohmic contact. Another approach to increase module power output is using a new module design.…”

Section: Introductionmentioning

confidence: 99%

Improved Bifacial Properties of P‐Type Passivated Emitter and Rear Cell Solar Cells toward High Mass Production Efficiency

Wang

Chen³

et al. 2021

Physica Status Solidi (a)

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Passivated emitter and rear cell (PERC) has shifted to mass production and achieved great success in the past few years. [1][2][3] In comparison with aluminum back surface field (Al-BSF)-type solar cells, the rear-side surface recombination is significantly reduced by introducing a passivation layer between silicon substrate and electrodes, which can boost both open-circuit voltage and short-circuit current. [4] Later, the average industrial conversion efficiency of p-type mono-silicon PERC has achieved 22.5-22.8% and even beyond 23% for few leading photovoltaic manufacturers, with the continuously evolving optimizations in industrialization technology, e.g., emitter doping optimization, [5,6] laser-doped selective emitter, [7,8] front surface anti-reflection and passivation, [9][10][11] and reduced shading loss and electrode contact. [12,13] Longi solar has released the world record R&D efficiency of 24.06% on a commercial-sized PERC, [14] which means there still exists a gap of %1% absolute in conversion efficiency moving from laboratory R&D efficiency toward mass production efficiency.An effective solution to further enhance the power generation capacity is the employment of a bifacial PERC structure. The bifacial PERC and module have the potential to absorb the scattered and reflected light on the back of the solar module, which can boost the module power output up to 30% and lower the levelized cost of electricity (LCOE). [15][16][17] However, the bifacility of p-type PERC is lower than that of other high-efficiency concepts, such as tunnel oxide passivated contact (TOPCon) and silicon heterojunction (SHJ) solar cell, limited by its obviously decreased short-circuit current at the rear side. Dullweber et al. first presented the novel bifacial PERC design by screen printing rear-side aluminum (Al) fingers instead of full-area Al-BSF, with a bifaciality of 79.3%, [18] and pioneered the bifacial application of PERC solar cells. The influence of rear-side morphology effects the passivation property significantly. A smooth rear surface is preferred to obtain high open-circuit voltage, [19,20] but suffers from rear-side light trapping limitation. One has to balance the rear passivation and photon absorption. Meanwhile, the deposition of a high-quality rear passivation film also helps the improvement of rear-side efficiency. The Al 2 O 3 film, SiO 2 film, SiN x film, and their stack layers have been studied to provide both excellent hydrogen passivation and chemical

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Low cost multicrystalline bifacial PERC solar cells – Fabrication and thermal improvement

Cited by 17 publications

References 8 publications

Effects of Different Particle-Sized Al Powders on Sintering Properties of Aluminum Paste in Crystalline Silicon Solar Cell

Effects of Different Particle-Sized Al Powders on Sintering Properties of Aluminum Paste in Crystalline Silicon Solar Cell

UMG silicon for solar PV: From defects detection to PV module degradation

Improved Bifacial Properties of P‐Type Passivated Emitter and Rear Cell Solar Cells toward High Mass Production Efficiency

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