SOLAR CELL WITH A CONTACT STRUCTURE AND METHOD OF ITS MANUFACTURE
The present invention describes a solar cell with a Silicon substrate, which includes a doped emitter region on which a contact structure is disposed, which includes several linear contact-fingers, wherein the distance between the contact-fingers varies and is adjusted to a changing doping profile over the surface of the emitter region.
1 . Solar cell, comprising a Silicon substrate having a doped emitter region, on which, a contact structure is disposed, which includes several linear, contact-fingers, wherein the doping level of the emitter region reduces from the peripheral zone towards the middle of the Silicon substrate, so that the emitter coating-resistance increases from the peripheral zone towards the middle of the Silicon substrate, and wherein the distance between the contact-fingers is adjusted to the varying emitter coating-resistance and changes over the surface of the emitter region, wherein the distance of the contact-fingers in the middle region of the doped Silicon substrate is shorter than in the peripheral zone.
2 . Solar cell according to claim 1 , wherein the linear contact-fingers run parallel to each other.
3 . Solar cell according to claim 1 , wherein the contact-fingers in a first zone run parallel to each other and are inclined in a second zone at the periphery of the doped Silicon substrate and are oriented towards the corners of the doped Silicon substrate.
4 . Solar cell according to claim 1 , wherein the distance between the contact-fingers changes continuously, at least partially over the doped Silicon substrate.
5 . Solar cell according to claim 1 , wherein the contact-fingers are disposed radially, such that their distance continuously increases outwards.
6 . Solar cell according to claim 1 , wherein the contact-fingers comprise a curved shape.
7 . Solar cell according to claim 1 , wherein the contact-fingers are curved radially or concave towards the corners of the Silicon substrate.
8 . Solar cell according to claim 1 , wherein the contact structure comprises at least one busbar, which transversely runs above the contact-fingers and is electrically connected to the contact-fingers, wherein the contact-fingers in the vicinity of the busbars point perpendicular or approximately perpendicular to the busbars.
9 . Solar cell according to claim 1 , wherein the contact-fingers are at least partially interrupted.
10 . Solar cell according to claim 1 , wherein one or more redundancy lines are inserted, in order to at least partially interconnect the ends of the interrupted contact-fingers.
11 . Photovoltaic module comprising two or more solar cells according to claim 1 , which are electrically connected in series via cell connectors.
12 . Photovoltaic module comprising two or more solar cells according to claim 2 , which are electrically connected in series via cell connectors.
13 . Photovoltaic module comprising two or more solar cells according to claim 3 , which are electrically connected in series via cell connectors.
14 . Photovoltaic module comprising two or more solar cells according to claim 4 , which are electrically connected in series via cell connectors.
15 . Photovoltaic module comprising two or more solar cells according to claim 5 , which are electrically connected in series via cell connectors.
16 . Photovoltaic module comprising two or more solar cells according to claim 6 , which are electrically connected in series via cell connectors.
17 . Photovoltaic module comprising two or more solar cells according to claim 7 , which are electrically connected in series via cell connectors.
18 . Photovoltaic module comprising two or more solar cells according to claim 8 , which are electrically connected in series via cell connectors.
19 . Photovoltaic module comprising two or more solar cells according to claim 9 , which are electrically connected in series via cell connectors.
20 . Photovoltaic module comprising two or more solar cells according to claim 10 , which are electrically connected in series via cell connectors.