Understanding the Influence of Busbars in Large-Area IBC Solar Cells by Distributed SPICE Simulations

Magnone, Paolo; Debucquoy, Maarten; Giaffreda, Daniele; Posthuma, Niels; Fiegna, Claudio

doi:10.1109/jphotov.2015.2392939

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…Moreover, SPICE was also qualified for the modeling of thin‐film solar modules . Numerous research studies have shown that SPICE is highly competent as a simulation tool for the analyses of solar cells.…”

Section: Introductionmentioning

confidence: 99%

Absolute electroluminescence imaging with distributed circuit modeling: Excellent for solar‐cell defect diagnosis

Hong

Wang

Chen

et al. 2019

Progress in Photovoltaics

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Spatially resolved absolute electroluminescence (EL) imaging demonstrates the localized EL intensity and the uniformity of solar cells. Combined with two‐dimensional (2‐D) distributed circuit network modeling, detailed and important information that is contained in experimental data can be extracted for in‐depth understanding of solar cell performances. Herein, we measured the absolute EL images of three different solar cells (Si, GaAs, and Cu (In,Ga)Se2 (CIGS)) and observed the different injection‐current‐dependent EL intensities of the defect points (dark or bright) on the solar cells. The origins of these defects were attributed to different defect types according to our established 2‐D distributed equivalent circuit model. The results demonstrated that the combination of absolute EL imaging and distributed circuit modeling yielded accurate quantitative diagnoses of the electrical defects in solar cells.

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Section: Introductionmentioning

confidence: 99%

Absolute electroluminescence imaging with distributed circuit modeling: Excellent for solar‐cell defect diagnosis

Hong

Wang

Chen

et al. 2019

Progress in Photovoltaics

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“…In FFE IBC solar cells, the holes generated in the region above BSF move to the nearest FFE, then laterally transport in the FFE, and finally reach the back emitter [8]. There is a lot of research work about the IBC solar cells with the FSF structure; however, the work about FFE IBC solar cells is relatively less abundant [7,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

et al. 2018

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Abstract:In this paper, we investigate interdigitated back contact solar cells with the front floating emitter structure systematically by using simulated and experimental methods. By comparing the front floating emitter structure with the front surface field structure, it is found that the efficiency of solar cells with the front surface field structure quickly reduces with the increasing of back surface field width; while solar cells with the front floating emitter structure can have a wider front surface field width range with minimum impact on the cell efficiency. More importantly, solar cells with the front floating emitter structure have a larger fabrication process tolerance, especially for the back surface field width, emitter width, and the bulk resistivity, which means that the fabrication process flow can be simplified and the production cost can be reduced. Based on the above results, large area (156.75 mm × 156.75 mm) interdigitated back contact solar cells with the front floating emitter structure are fabricated by using the simplified process with only one masking step. SiO x :B is used as the passivation layer, which can lead to a higher open circuit voltage and lower surface saturation current density. Finally, an efficiency of 20.39% is achieved for the large area solar cells.

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“…The Quokka simulation represents one unit cell of half an emitter finger and half a BSF finger, resulting in an efficiency of 23.0%. The post processing is done with analytical expressions, similar to what we previously reported , and takes into account resistive losses in the metal fingers and metal busbars and losses related to the doped Si regions above the busbars. This is summarized in Figure , where the simulated cell efficiency is shown, as a function of the busbar width, with variations in the number of busbars (6, 8 or 10), and the number of contact pads per busbar (in the range from 4 to 16).…”

Section: Cell‐module Co‐designmentioning

confidence: 99%

A woven fabric for interconnecting back‐contact solar cells

Borgers

Govaerts

Voroshazi

et al. 2016

Progress in Photovoltaics

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This paper reports on a novel and highly innovative technology to interconnect back‐contact cells. First, a background section explains the currently developed interconnection technologies. Then, our novel concept is introduced: interconnection of the cells is achieved with a woven fabric, combining both conductive wires, needed for the interconnection, and insulating wires, crucial to avoid shunting between both polarities at the backside of the cell. Weaving also allows out‐of‐plane stress relief features. In the third section, we explain that our technology combines the advantages of multi‐wire interconnection such as low‐stress and reduced resistive losses with known and low‐cost materials of traditional module assembly. Additional to previous publications, we demonstrate that the technology can be tuned broadly in terms of costs and resistive losses using an optimized interconnection pattern. These resistive loss simulations are also validated with the measured additional resistance in IBC test samples. We also present a preliminary thermal cycling test with promising results. Finally, first functional demonstrators IBC cells are fabricated, disclosing the process flow and initial technology developments. These results clearly demonstrate the proof‐of‐concept of the woven interconnection fabric, and based on electrical characterization we provide suggestions for improvements. Copyright © 2016 John Wiley & Sons, Ltd.

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Understanding the Influence of Busbars in Large-Area IBC Solar Cells by Distributed SPICE Simulations

Cited by 12 publications

References 23 publications

Absolute electroluminescence imaging with distributed circuit modeling: Excellent for solar‐cell defect diagnosis

Absolute electroluminescence imaging with distributed circuit modeling: Excellent for solar‐cell defect diagnosis

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

A woven fabric for interconnecting back‐contact solar cells

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