MULTI-JUNCTION SOLAR MODULE AND METHOD FOR CURRENT MATCHING BETWEEN A PLURALITY OF FIRST PHOTOVOLTAIC DEVICES AND SECOND PHOTOVOLTAIC DEVICES
A multi-junction solar module apparatus. The apparatus has a substrate member. The apparatus has a plurality of first photovoltaic devices arranged in a first spatial configuration, which is preferably disposed on a first planar region. In a specific embodiment, the plurality of first photovoltaic devices are numbered from 1 through N, where N is an integer greater than 1. Each of the plurality of first solar cells has a first bandgap characteristic. The apparatus has a plurality of second photovoltaic devices arranged in a second spatial configuration, which is preferably disposed in a second planar region. The plurality of second photovoltaic devices are numbered from 1 through M, where M is an integer greater than 1. In a preferred embodiment, N is not equal to M. Each of the second solar cells has a second band gap characteristic. In a specific embodiment, a first connector interconnects the plurality of first solar cells in a serial configuration. The first connector has a first terminal end and a second terminal end. A second connector interconnects the plurality of second solar cells in a serial configuration. The second connector has a first terminal end and a second terminal end. In a specific embodiment, a third connector connecting the second terminal end of the first connector and the first terminal end of the second connector. In a specific embodiment, a Vss node is coupled to the first terminal end of the first connector. In a specific embodiment, a Vdd node is coupled to the second terminal end of the second connector. In a preferred embodiment, N and M are selected to match a first current through the plurality of first solar cells and a second current through the plurality of second solar cells.
1 . A multi-junction solar module device, the device comprising;
a substrate member;
a plurality of first photovoltaic devices arranged in a first spatial configuration, the plurality of first photovoltaic devices numbered from 1 through N, where N is an integer greater than 1, each of the plurality of first photovoltaic devices being, characterized by a first device area and having a first bandgap characteristic;
a plurality of second photovoltaic devices arranged in a second spatial configuration, the plurality of second photovoltaic devices numbered from 1 through M, where M is an integer greater than 1, whereupon N is not equal to M, each of the second photovoltaic devices being characterized by a second device area and having a second band gap characteristic;
a first connector interconnecting the plurality of first photovoltaic devices in a serial configuration, the first connector having a first terminal end and a second terminal end;
a second connector interconnecting the plurality of second photovoltaic devices in a serial configuration; the second connector having a first terminal end and a second terminal end;
a third connector connecting the second terminal end of the first connector and the first terminal end of the second connector;
a first output node coupled to the first terminal end of the first connector;
a second output node coupled to the second terminal end of the second connector; and
whereupon N and M are selected to match a first current through the plurality of first photovoltaic devices and a second current through the plurality of second photovoltaic devices.
2 . The device of claim 1 further comprising a glass cover overlying the plurality of second photovoltaic devices.
3 . The device of claim 1 further comprising an EVA overlying the plurality of second photovoltaic devices.
4 . The device of claim 1 further comprising an insulating material provided between the plurality of first photovoltaic devices.
5 . The device of claim 1 wherein the first bandgap ranges from about 1.5 eV to about 1.9 eV.
6 . The device of claim 1 wherein the second bandgap ranges from about 0.7 eV to about 1 eV.
7 . The device of claim 1 further comprising a plurality of third photovoltaic devices arranged in a third spatial configuration, the plurality of third photovoltaic devices numbered from 1 through P, where P is an integer greater than 1, whereupon P is not equal to N or M, the plurality of third photovoltaic devices being coupled to the plurality of first photovoltaic devices and the plurality of second photovoltaic devices.
8 . The device of claim 1 wherein each of the plurality of first photovoltaic devices comprises an absorber layer selected from CuInS 2 , SnS, Cu(In 2 Al)S 2 , Cu(In 1-x ), Al x )S 2 , Cu(In, Ga)S 2 , or Cu(In 1-x , Ga)S 2 .
9 . The device of claim 1 wherein each of the plurality of second photovoltaic devices comprises an absorber layer selected from CIGS, Cu 2 SnS 3 , FeS 2 , or Ge.
10 . The device of claim 1 wherein each of the plurality of first photovoltaic devices comprises a copper indium disulfide species as an absorber layer and each of the plurality of second photovoltaic devices comprises CIGS species as an absorber layer.
11 . (canceled)
12 . A multi-junction solar module device, the device comprising:
a substrate member;
a plurality of first photovoltaic devices arranged in a first spatial configuration, the plurality of first photovoltaic devices numbered from 1 through N, where N is an integer greater than 1, each of the plurality of first photovoltaic devices being characterized by a first device area and having a first bandgap characteristic;
a plurality of second photovoltaic devices arranged in a second spatial configuration, the plurality of second photovoltaic devices numbered from 1 through M, where M is an integer greater than 1, whereupon N is not equal to M, each of the second photovoltaic devices being characterized by a second device area and having a second band gap characteristic;
a first plurality of connectors interconnecting the plurality of first photovoltaic devices in a parallel configuration, the first plurality of connectors having a first terminal end and a second terminal end;
a second plurality of connectors interconnecting the plurality of second photovoltaic devices in a parallel configuration; the second plurality of connectors having, a first terminal end and a second terminal end;
a third connector connecting the second terminal end of the first plurality of connectors and the first terminal end of the second plurality of connectors;
a first output node coupled to the first terminal end of the first plurality of connectors;
a second output node coupled to the second terminal end of the second plurality of connector; and
whereupon N and M are selected to match a first total current through the plurality of first photovoltaic devices and a second total current through the plurality of second photovoltaic devices.
13 . The device of claim 12 wherein each of the plurality of first photovoltaic devices comprises a serial or parallel combination of a plurality of third photovoltaic devices.
14 . The device of claim 12 wherein each of the plurality of second photovoltaic devices comprises a serial or parallel combination of a plurality of fourth photovoltaic devices.
15 . A method for making a multi-junction solar module device, the method comprising:
forming a first sub-module, the first sub-module includes a plurality of first photovoltaic devices, each of the plurality of first photovoltaic devices being characterized by a first device area and having a first bandgap characteristic for providing a predetermined electrical current;
interconnecting the plurality of first photovoltaic devices in a serial configuration;
forming a second sub-module, the second sub-module includes a plurality of second photovoltaic devices, each of the plurality of second photovoltaic devices being characterized by a second device area and having a second bandgap characteristic for providing the predetermined electrical current;
interconnecting the plurality of second photovoltaic devices in a serial configuration;
mounting the first sub-module over the second sub-module.