Development and Integration of a High Efficiency Baseline Leading to 23% IBC Cells

Aleman, Monica; Das, Jo; Janssens, Tom; Pawlak, Bartek; Posthuma, Niels; Robbelein, Jo; Singh, Sukhvinder; Baert, Kris; Poortmans, Jef; Fernandez, Jara; Yoshikawa, Kunta; Verlinden, Pierre J.

doi:10.1016/j.egypro.2012.07.122

Cited by 27 publications

(15 citation statements)

References 3 publications

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“…This process leads to an FSF saturation current density J o,FSF of approximately 20 fA/cm 2 . [13]. Up to this point, the wafers are free standing.…”

Section: Device Processmentioning

confidence: 94%

“…This constraint introduces a problem for the emitter formation and surface passivation of the back contact solar cell. Conventionally, the emitter of the cell is formed through diffusion of dopants into the wafers at temperatures above 900 • C [13]. The surface is passivated either by a thermal oxide grown during diffusion or by dielectric deposition and forming gas annealing at a temperature above 400 • C [14].…”

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confidence: 99%

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Heterojunction Interdigitated Back-Contact Solar Cells Fabricated on Wafer Bonded to Glass

Granata¹,

Aleman²,

Bearda³

et al. 2014

IEEE J. Photovoltaics

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Future wafer-based silicon solar cells will be fabricated on thin (<140 μm) wafers. However, technologies to handle thin wafers during cell processing are not yet available for industry. In this paper, a flow to handle thin wafers during rear side cell processing is developed and demonstrated on 4-in 200 μm-thick wafers. The flow involves bonding the wafers to glass after frontside processing followed by a low-temperature p-n heterojunction formation on the rear side. 2.5 × 2.5 cm 2 amorphous/crystalline silicon heterojunction interdigitated back-contact solar cells are fabricated by use of lithography while bonded to glass, and they show an efficiency of up to 17.7%. Shunts, infrared light absorption, and rear side interface passivation are identified as the main efficiency losses. Dedicated experiments suggest that the passivation losses are related to the degradation of the adhesive during wafer cleaning. Hence, methods to improve the compatibility of the adhesive with the cleaning process are discussed. Index Terms-Heterojunction silicon solar cells, interdigitatedback-contact (i-BC), superstrate processing.

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“…This process leads to an FSF saturation current density J o,FSF of approximately 20 fA/cm 2 . [13]. Up to this point, the wafers are free standing.…”

Section: Device Processmentioning

confidence: 94%

mentioning

confidence: 99%

Heterojunction Interdigitated Back-Contact Solar Cells Fabricated on Wafer Bonded to Glass

Granata¹,

Aleman²,

Bearda³

et al. 2014

IEEE J. Photovoltaics

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show abstract

“…There was a continuous decrease in series resistance and Suns V oc with Figure 9: Variation of (a) left/right contact recombination with respect to contact ratio and (b) left/right contact recombination current with respect to contact ratio. 7 International Journal of Photoenergy respect to the contact ratio. Moreover, there was a negligible increase in V oc (calculated from light J-V) with line contact.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, a research paper published in Nature Energy (by Yoshikawa et al [1]) has reported cell efficiency above 26% on IBC structure. In the past, an efficiency of above 25% [2][3][4], above 24% [5], and above 23% [6,7] based on IBC structure have also been reported by different research groups. Moreover, solar cells based on IBC structure have been produced commercially [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simulation Results: Optimization of Contact Ratio for Interdigitated Back-Contact Solar Cells

Budhraja

Devayajanam

Basnyat

2017

International Journal of Photoenergy

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In the fabrication of interdigitated back contact (IBC) solar cells, it is very important to choose the right size of contact to achieve the maximum efficiency. Line contacts and point contacts are the two possibilities, which are being chosen for IBC structure. It is expected that the point contacts would give better results because of the reduced recombination rate. In this work, we are simulating the effect of contact size on the performance of IBC solar cells. Simulations were done in three dimension using Quokka, which numerically solves the charge carrier transport. Our simulation results show that around 10% of contact ratio is able to achieve optimum cell efficiency.

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“…More recently, Trina Solar together with the Australian National University (ANU) have demonstrated small scale (2 Â 2 cm 2 ) IBC solar cells with conversion efficiency of 24.4% [8]. At laboratory scale (2 Â 2 cm 2 ) conversion efficiencies of 23.3%, 23% and 23.1% have been also reached at imec [9], Fraunhofer Institute for Solar Energy Systems ISE [10] and Institut für Solarenergieforshung Hamelin (ISFH) [11], respectively. These achievements clearly demonstrate that IBC c-Si solar cells can deliver high conversion efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Simplified process for high efficiency, self-aligned IBC c-Si solar cells combining ion implantation and epitaxial growth: Design and fabrication

Ingenito

Isabella

Zeman

2016

Solar Energy Materials and Solar Cells

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Development and Integration of a High Efficiency Baseline Leading to 23% IBC Cells

Cited by 27 publications

References 3 publications

Heterojunction Interdigitated Back-Contact Solar Cells Fabricated on Wafer Bonded to Glass

Heterojunction Interdigitated Back-Contact Solar Cells Fabricated on Wafer Bonded to Glass

Simulation Results: Optimization of Contact Ratio for Interdigitated Back-Contact Solar Cells

Simplified process for high efficiency, self-aligned IBC c-Si solar cells combining ion implantation and epitaxial growth: Design and fabrication

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