Rear-side All-by-Laser Point-contact Scheme for liquid-phase-crystallized silicon on glass solar cells

Weizman, M.; Rhein, H.; Bhatti, K.; Duman, Ramona; Schultz, Christof; Schüle, M.; Gabriel, Onno; Ring, Sven; Kirner, Simon; Klimm, C.; Nittel, Mathias; Gall, S.; Rau, B.; Stannowski, Bernd; Schlatmann, Rutger; Fink, F.

doi:10.1016/j.solmat.2015.02.003

Cited by 17 publications

(19 citation statements)

References 23 publications

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“…This finalizes the absorber preparation process. Possible alternatives to this process chain used by Helmholtz-Zentrum Berlin or other groups include the usage of Schott Borofloat®33, 3.3mm substrates [Weizman15], PECVD deposition of the interlayer stack and amorphous silicon absorber at low temperatures and subsequent annealing [Gabriel14,Calnan15] or deposition of a single silicon nitride passivation layer [Plentz14]. Table 1 summarizes these alternatives, achieved open circuit voltages and cell efficiencies.…”

Section: Formation and Properties Of Lpc Absorbersmentioning

confidence: 99%

“…Additional technological challenges are present, due to the imperfect surface flatness of the glass substrates after crystallization, which reduces the minimum feature size using photolithography to about 10 micrometers. Alternatively, these challenges can be circumvented using other structuring methods, such as laser ablation or inkjet printing [Weizman15,Dore13]. Another issue of LPC absorbers is the occasional occurrence of cracks parallel to scanning direction.…”

Section: Contact Systems For Liquid Phase Crystallized Siliconmentioning

confidence: 99%

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Progress in and potential of liquid phase crystallized silicon solar cells

et al. 2018

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Liquid phase crystallization of silicon (LPC-Si) offers great potential for high-quality Si films and a cost effective fabrication technique for thin crystalline silicon solar cells on glass. In this work, we report on the progress on LPC-silicon at HZB in the past years. Beginning with a brief description of the fabrication process, we summarize the work on the different contact systems developed for these absorbers before focusing on the interdigitated back contact architecture on which the highest efficiencies were reported. State-of-the art cells form the basis for a detailed discussion of the status of this technology. We investigate the current loss mechanisms and explore the potential for further improvement. Finally, based on this comprehensive quality assessment, we develop a roadmap to increase the cell efficiencies to wafer-equivalent values.

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Section: Formation and Properties Of Lpc Absorbersmentioning

confidence: 99%

Section: Contact Systems For Liquid Phase Crystallized Siliconmentioning

confidence: 99%

Progress in and potential of liquid phase crystallized silicon solar cells

et al. 2018

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“…A modified version of this concept has been applied to LPC‐Si solar cells at UNSW . Based on this concept, an all‐laser‐process has been developed, which applied only laser processes for cell definition, point‐contact opening, contact firing, and metal patterning (Figure (d)) .…”

Section: Fabrication Of Liquid‐phase Crystallized Silicon‐based Solarmentioning

confidence: 99%

Crystalline silicon on glass—interface passivation and absorber material quality

Gabriel

Frijnts

Preissler

et al. 2015

Progress in Photovoltaics

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Thin crystalline silicon solar cells prepared directly on glass substrates by means of liquid-phase crystallization of the absorber utilize only a small fraction of the silicon material used by standard wafer-based silicon solar cells. The material consists of large crystal grains of up to square centimeter area and results in solar cells with open-circuit voltages of 650 mV, which is comparable with results achieved with multi-crystalline silicon wafers. We give a brief status update and present new results on the electronic interface and bulk properties. The interrelation between surface passivation and additional hydrogen plasma passivation is investigated for p-type and n-type absorbers with different doping concentrations. Internal quantum efficiency measurements from both sides on bifacial solar cells are used to extract the bulk-diffusion length and surface-recombination velocity. Finally, we compare various types of solar cell devices based on 10 μm thin crystalline silicon, where conversion efficiencies of 11-12% were achieved with p-type and n-type liquid-phase crystallized absorbers on glass.

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“…High passivation quality, thermal compatibility, adhesion, and blocking of impurities by the SiO x /SiN x /SiO x N y layers between silicon and glass (Figure ) are key to the adoption of LPC‐Si to new substrates . Alternative HJ‐based photolithography‐free contacting schemes have also been shown previously …”

Section: Introductionmentioning

confidence: 88%

Toward High Solar Cell Efficiency with Low Material Usage: 15% Efficiency with 14 μm Polycrystalline Silicon on Glass

et al. 2020

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Liquid‐phase‐crystallized silicon (LPC‐Si) is a bottom‐up approach to creating solar cells with the potential to avoid material loss and energy usage in wafer slicing techniques. A desired thickness of silicon (5–40 μm) is crystallized with a line‐shaped energy source, which is a laser, herein. The first part reports the efforts to optimize amorphous silicon contact layers for better surface passivation. The second part covers laser firing on the electron contact. It enables a controllable trade‐off between charge collection and fill factor (FF) by creating a low resistance contact, while preserving a‐Si:H (i) passivation in other areas. Short‐circuit current density (JSC) is observed to be up to 33:1 mA cm−2, surpassing all previously reported values for this technology. Open‐circuit voltage (VOC) of up to 658 mV also exceeded every previous value published at a low bulk doping concentration (1 × 1016 cm−3). Laser firing reduced JSC by 0:6 mA cm−2 on average but improved the FF by 22.5% absolute on average, without any significant effect on VOC. Collectively, these efforts have helped in achieving a new in‐house record efficiency for LPC‐Si of 15.1% and show a potential to reach 16% efficiency in the near future with optimization of series resistance.

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Rear-side All-by-Laser Point-contact Scheme for liquid-phase-crystallized silicon on glass solar cells

Cited by 17 publications

References 23 publications

Progress in and potential of liquid phase crystallized silicon solar cells

Progress in and potential of liquid phase crystallized silicon solar cells

Crystalline silicon on glass—interface passivation and absorber material quality

Toward High Solar Cell Efficiency with Low Material Usage: 15% Efficiency with 14 μm Polycrystalline Silicon on Glass

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