Borosilicate spray-on glass solutions for fabrication silicon solar cell back surface field

Filipowski, Wojciech; Drabczyk, K.; Wróbel, E.; Sobik, Piotr; Waczyński, K.; Waczynska-Niemiec, Natalia

doi:10.1108/mi-12-2017-0075

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…The dopant sources may be used in solar cell production being deposited onto the wafer surface by means of screen-printing [6,7], spray-on method [8,9], or formed from the gaseous phase [10]. The contact between the electrode and the semiconductor may also depend on the type of the dopant source, which should also be taken into account when analyzing the measurement results.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Different Electrical Parameters of Solar Cells with Silver Front Electrodes

2019

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This work presents comparison results of the selected electrical parameters of silicon solar cells manufactured with silver front electrodes which were co-fired in an infrared belt furnace in the temperature range of 840–960 °C. The commercial paste (PV19B) was used for the metallization process. Electrical properties of a batch of solar cells fabricated in one cycle were investigated. Three methods were used, including measurement of the current-voltage characteristics (I-V), measurement of contacts’ resistivity using the transmission Line model method (TLM), and measurement of contacts’ resistivity using the potential difference method (PD). This work is focused on both the different metallization temperatures of co-firing of solar cells and measurements using the above-mentioned methods. It is shown that the solar cell parameters measured with three methods have different, but strongly correlated values. Moreover, the comparative analysis was performed of the investigations of the same photovoltaic solar cells using both the TLM method and independent research stands (including one non-commercial and two commercial ones) at three different scientific units. In the PD and TLM methods, the same calculation formulae are used. It can be stated, comparing methods I-V, PD, and TLM, that for each, different parameters are determined to assess the electrical properties of the solar cell.

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Section: Introductionmentioning

confidence: 99%

Correlation of Different Electrical Parameters of Solar Cells with Silver Front Electrodes

2019

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“…The developed model allows highly accurate determination of boron concentration profile in silicon for dopant sources in the form of solution of boric acid in ethanol (Singha and Solanki, 2018). After additional research, it can be adapted to describe diffusion process using borosilicate spray-on glass solutions (Filipowski et al , 2018; Panek et al , 2016). It may be used to determine concentration profiles both in the emitter layer, as well as in the back surface field.…”

Section: Discussionmentioning

confidence: 99%

Model of boron diffusion in silicon used for solar cell fabrication based on boric acid solutions

Filipowski

2022

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Purpose The purpose of this paper is to develop a model that allows determining the boron concentration profile in silicon based on duration and temperature of the diffusion process. Design/methodology/approach The model was developed on the basis of the Fick’s second law, which is fundamental for describing the diffusion process. The explicit scheme of the finite difference method was used in the conducted simulations. Results of measurements made using the secondary ion mass spectrometry (SIMS) were used as template dopant concentration profiles. Solution of boric acid in ethanol is the dopant source for which this model was developed. Findings Based on the conducted simulations, it was proposed that besides the influence of electric field of ionized dopants, which is already described in literature, an appropriate factor reflecting the influence of the threshold concentration on the coefficient of diffusion of boron in silicone should also be introduced. Originality/value The developed model enables determination of the boron concentration profile in silicon consistent with the results of SIMS measurements. A factor taking into account the influence of threshold concentration on the coefficient of diffusion was introduced. The influence of concentration of boric acid in the dopant solution on the concentration profile was also considered.

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“…As modern photovoltaic (PV) systems are based on the modules that are able to operate for more than 25 years (Jordan et al, 2016), also glass-free modules should fulfill this requirement. Even solar cell low-cost production technologies such as time-efficient texturization process (Kulesza et al, 2014;Kulesza-Matlak et al, 2018), emitter layer production (Drabczyk et al, 2016;Filipowski et al, 2017), solar cell back surface field manufacturing technologies (Filipowski et al, 2018) or electrode manufacturing technologies Drabczyk et al, , 2015 ensure durability significantly exceeding the required 25 years. Unfortunately, one of the lifetime limitations of PV modules is the fatigue of solar cell ribbon (Herrmann et al, 2010;Itoha et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The impact of ribbon treatment on the interconnection of solar cells withina glass free PV module

Sobik

Pawłowski

Pluta

et al. 2019

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Purpose The purpose of this paper is to investigate the behavior of interconnections between solar cells in a glass-free solar modules. As glass weight can be a limitation, it is still interesting to investigate other types of systems, especially when the glass was replaced with a polymeric front sheet. Such systems can be more sensitive for the solar cell interconnection ribbon fatigue. Design/methodology/approach To examine this effect, the set of glass-based and glass-free modules were prepared using various ribbon thickness and treatment concerning its stretching or curving before lamination. Furthermore, additional reinforcement of the connection between the ribbon and the solar cell was proposed. The prepared modules were exposed to the cyclic temperature variation in the environment chamber. The number of cycles after which the interconnection maintains its conductivity was noted. Findings Changing the outer layers into more elastic ones requires additional care for the ribbon treatment because interconnections become more sensitive for a system relative displacement. To secure interconnection before fatigue an additional curving of ribbon between solar cells can be introduced whereas the best results were obtained for a system with aluminum plate laminated as an interlayer. Originality/value The paper presents a new system of a glass-free solar module based on epoxy-glass fiber composite as a backsheet. The glass front sheet was replaced with an elastic, transparent polymer. Such construction can be used in a system where the glass weight is a limitation. As glass has a structural function in traditional modules and limits fatigues of interconnections the proposed system requires additional ribbon treatment to preserve long module life-span.

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Borosilicate spray-on glass solutions for fabrication silicon solar cell back surface field

Cited by 3 publications

References 8 publications

Correlation of Different Electrical Parameters of Solar Cells with Silver Front Electrodes

Correlation of Different Electrical Parameters of Solar Cells with Silver Front Electrodes

Model of boron diffusion in silicon used for solar cell fabrication based on boric acid solutions

The impact of ribbon treatment on the interconnection of solar cells withina glass free PV module

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