High Quality Half-cell Processing Using Thermal Laser Separation

Eiternick, S.; Kaule, Felix; Zühlke, Hans-Ulrich; Kießling, Thomas; Grimm, Michael; Schoenfelder, Stephan; Turek, Marko

doi:10.1016/j.egypro.2015.07.048

Cited by 31 publications

(24 citation statements)

References 3 publications

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“…This is especially true since in this study, a perfect separation of the solar cell without additional electrical losses is presupposed. Such high-quality electrical properties cannot be achieved, not even with new laser technologies, for example the thermal laser separation (TLS) [4]. But the use of partial solar cells has further disadvantages.…”

Section: Discussionmentioning

confidence: 99%

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Optimized Size and Tab Width in Partial Solar Cell Modules including Shingled Designs

Roeth¹,

Facchini²,

Bernhard³

2017

International Journal of Photoenergy

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Cell-to-module loss (CTM loss) is defined by optical and electrical losses. Using partial solar cells can reduce ohmic losses. Today, some manufactures use halved cells even if they have to employ extra effort for sorting, placing, and soldering the solar cells. In this work, the advantage of partial solar cells is described. An LTSpice simulation is used to quantify the reduced ohmic loss and the resulting efficiency gain for differently separated solar cells. This efficiency gain is compared with the whole module area caused by the tab and cell areas. The additional gain due to the backsheet reflection is added afterwards. It can be pointed out that the use of half cells is a technical optimal application while not using shingled modules.

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Section: Discussionmentioning

confidence: 99%

“…An additional electrical loss due to the cell separation of about 1% rel. is presented in the literature [4] but not carried out in this work. This neglect should be kept in mind.…”

Section: Simulation Modelmentioning

confidence: 99%

Optimized Size and Tab Width in Partial Solar Cell Modules including Shingled Designs

Roeth¹,

Facchini²,

Bernhard³

2017

International Journal of Photoenergy

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“…The separation process used in the previous work is based on conventional laser scribing and mechanical cleaving. This work demonstrates pSPEER solar cells obtained by means of a newly integrated thermal laser separation (TLS) process [12], previously demonstrated on half-cut cells [13,14]. The paper includes a description of the designated area current-voltage measurement set-up suitable for characterizing pSPEER cells with different busbar layouts.…”

Section: Introductionmentioning

confidence: 99%

Bifacial shingle solar cells on p-type Cz-Si (pSPEER)

Baliozian

Lohmüller

Fellmeth

et al. 2018

AIP Conference Proceedings

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Abstract. The concepts of bifaciality and shingling interconnection allow for a boost in output power density pout for silicon-based photovoltaic modules. This work examines silicon-based, bifacial shingle solar cells called "p-type shingled passivated edge, emitter, and rear (pSPEER)". A specially designed shingle metallization layout on industrial 6-inch p-type Czochralski-grown silicon precursors is contact fired to obtain the host wafer. Six pSPEER cells each of an area of 23 mm x 148 mm are obtained by a newly integrated thermal laser separation step, leaving a very smooth edge for the singulated pSPEER cells. The peak front side output power density is pout,f = 20.8 mW/cm 2 (equivalent to a peak energy conversion efficiency  = 20.8% under standard test conditions). A total output power density pout = 21.9 mW/cm 2 is attained by assuming an additional rear irradiance of 100 W/m².

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“…Using half-cut solar cells in a photovoltaic (PV) module is proposed as an efficient way to reduce cell-to-module resistive losses due to the reduced current level in cell strings [10][11][12]. Cells are cut into halves by a laser cutter, the parameters of which are strongly correlated with the quality of the cut cells and further performance of the half-cell-based modules [13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Benefit of Half-Cut Cells towards Higher Cell-to-Module Power Ratio

Zhang¹,

Zhuang²,

Gou³

et al. 2018

dteees

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Abstract. Half-cut cell technology has been proposed as an effective way to largely decrease the cell to module loss by decreasing the current level in the cell string. The type of laser is strongly correlated with the quality of the cut cells and further performance of the half-cell based modules. We investigated the effect of laser on the quality and performance of half-cut cells. And different types of half-cut cells were made into modules, the cell-to-module power ratio of which was evaluated and compared with full-size cells. Electroluminescence was employed to characterize the quality of the cut cells as well as the half-cell modules. Our results demonstrate that an approximately 2.2% average extra power gain can be obtained using half-cut cells for module encapsulation.

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High Quality Half-cell Processing Using Thermal Laser Separation

Cited by 31 publications

References 3 publications

Optimized Size and Tab Width in Partial Solar Cell Modules including Shingled Designs

Optimized Size and Tab Width in Partial Solar Cell Modules including Shingled Designs

Bifacial shingle solar cells on p-type Cz-Si (pSPEER)

Study on the Benefit of Half-Cut Cells towards Higher Cell-to-Module Power Ratio

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