期刊
METALS AND MATERIALS INTERNATIONAL
卷 24, 期 3, 页码 664-671出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-018-0032-8
关键词
PERC solar cells; Aluminum silicon eutectic paste; Al paste; Rear passivation
资金
- National Research Foundation of Korea - Korean Government (MSIP) (University-Institute 165 cooperation program)
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%.
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