Optimization of Controllable Factors in the Aluminum Silicon Eutectic Paste and Rear Silicon Nitride Mono-Passivation Layer of PERC Solar Cells

Passivated emitter and rear contact (PERC) is a promising technology owing to high efficiency can be achieved with p-type wafer and their easily applicable to existing lines. In case of using p-type mono wafer, 0.5–1% efficiency increase is expected with PERC technologies compared to existing Al BSF...

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Bibliographic Details
Published in:Metals and materials international 2018, 24(3), , pp.664-671
Main Authors: Park, Sungeun, Park, Hyomin, Kim, Dongseop, Yang, JungYup, Lee, Dongho, Kim, Young-Su, Kim, Hyun-Jong, Suh, Dongchul, Min, Byoung Koun, Kim, Kyung Nam, Park, Se Jin, Kim, Donghwan, Lee, Hae-Seok, Nam, Junggyu, Kang, Yoonmook
Format: Article
Language:English
Subjects:
Adhesion
Aluminum
Characterization and Evaluation of Materials
Chemistry and Materials Science
Efficiency
Electron microscopy
Emitters
Emitters (electron)
Engineering Thermodynamics
Eutectic composition
Frit
Heat and Mass Transfer
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Metallic Materials
Open circuit voltage
Optimization
Passivity
Pastes
Photovoltaic cells
Processes
Silicon base alloys
Silicon nitride
Solar cells
Solid Mechanics
재료공학
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Summary:Passivated emitter and rear contact (PERC) is a promising technology owing to high efficiency can be achieved with p-type wafer and their easily applicable to existing lines. In case of using p-type mono wafer, 0.5–1% efficiency increase is expected with PERC technologies compared to existing Al BSF solar cells, while for multi-wafer solar cells it is 0.5–0.8%. We addressed the optimization of PERC solar cells using the Al paste. The paste was prepared from the aluminum–silicon alloy with eutectic composition to avoid the formation of voids that degrade the open-circuit voltage. The glass frit of the paste was changed to improve adhesion. Scanning electron microscopy revealed voids and local back surface field between the aluminum electrode and silicon base. We confirmed the conditions on the SiNx passivation layer for achieving higher efficiency and better adhesion for long-term stability. The cell characteristics were compared across cells containing different pastes. PERC solar cells with the Al/Si eutectic paste exhibited the efficiency of 19.6%.
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-018-0032-8