Patent ID: 11929441
Assignee: SOLARLAB AIKO EUROPE GMBH
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A conductive contact structure of a solar cell, the conductive contact structure comprising:
a substrate;
a semiconductor region;
an electrode; and
a passivation film, the passivation film comprising an opening;, wherein:
the semiconductor region is disposed on the substrate, and the semiconductor region comprises a tunnel oxide layer and doped polysilicon;
the electrode is disposed on the semiconductor region;
the electrode comprises a bottom layer and an upper layer, wherein the bottom layer is a seed layer and the upper layer is a conductive layer, and the conductive layer comprises Cu and is disposed on a top surface of the seed layer;
the seed layer comprises an alloy material;
the alloy material comprises a first component and a second component;
the first component is Al in an amount greater than or equal to 70 wt. % of the seed layer;
the second component comprises any one or more of Mo, Ti, and W in an amount less than or equal to 30 wt. % of the seed layer;
the tunnel oxide layer is disposed on the substrate, and the doped polysilicon is disposed on the tunnel oxide layer;
the passivation film covers side walls of the tunnel oxide layer and the doped polysilicon and a part of a top surface of the doped polysilicon;
the opening is disposed on the top surface of the doped polysilicon; and
a bottom of the seed layer is only in connection to the passivation film and the doped polysilicon, and a connection between the bottom of the seed layer and the doped polysilicon is through the opening.