Systems and methods for processing solar substrates

1. A system for processing a solar substrate comprising:

a support structure for supporting a solar substrate;

a brushing system for selectively removing an interaction layer from an electrode region of the solar substrate; and

an ultrasonic bonding system configured to bond a conductor to the electrode region after the selective removal of the interaction layer from the electrode region.

2. The system of claim 1 wherein the brushing system includes a rotary brush.

3. The system of claim 1 wherein the brushing system is configured to remove the interaction layer from selected portions of the electrode region corresponding to bonding locations of the electrode region, the bonding locations being configured to receive bonded portions of a conductive ribbon.

4. The system of claim 1 further comprising a monitoring system for monitoring a characteristic of a brushing operation of the brushing system such that the brushing operation may be stopped upon the monitoring system determining that the characteristic reaches at least one of (a) a predetermined value, (b) a predetermined amount of change, and (c) a predetermined rate of change.

5. The system of claim 4 wherein the characteristic includes at least one of (a) a speed of a brushing motor of the brushing system; (b) a force applied between a brush of the brushing system and a surface of the electrode region; (c) a brushing time elapsed during the brushing operation; (d) a brushing sound during the brushing operation; (e) a current of a brushing motor of the brushing system; (f) a torque of a brushing motor of the brushing system; (g) a color change of a portion of the electrode region being brushed; (h) a temperature of a portion of the electrode region brushed by the brushing system; and (i) a temperature of a portion of the brush of the brushing system.

6. The system of claim 4 wherein the characteristic includes at least one of (a) a force applied between a brush of the brushing system and a surface of the electrode region; and (b) a current of a brushing motor of the brushing system.

7. The system of claim 4 wherein a time delay is provided before the brushing operation is stopped but after the characteristic reaches the at least one of the predetermined value, the predetermined amount of change, and the predetermined rate of change.

8. The system of claim 1 wherein the brushing system includes a plurality of brushes.

9. The system of claim 8 wherein the plurality of brushes are individually operable.

10. The system of claim 1 further comprising a removal system configured to remove an absorbing layer from the electrode region, the interaction layer being positioned beneath the absorbing layer.

11. The system of claim 10 wherein the removal system includes at least one of (a) a scraping system for scraping the absorbing layer from the electrode region; (b) a laser ablation system for removing the absorbing layer from the electrode region; and (c) another brushing system for removing the absorbing layer from the electrode region.

12. The system of claim 1 wherein the solar substrate is a CIGS type thin film solar substrate.

13. The system of claim 1 wherein the electrode region comprises Mo.

14. The system of claim 1 wherein the brushing system includes a motorized brush comprising a plurality of bristles extending in a direction from a shaft of the motorized brush toward an outer edge of the bristles.

15. The system of claim 14 wherein during rotation of the shaft the outer edge of ones of bristles brushes the electrode region, the ones of the bristles brushing the electrode region continuously changing based on the rotation of the shaft.

16. The system of claim 1 wherein the brushing system includes a motorized brush comprising a plurality of bristles, the motorized brush including a first confining structure on a first side of the bristles and a second confining structure on a second side of the bristles, such that the bristles are confined between the first confining structure and the second confining structure, wherein an outer portion of the bristles extends past the first confining structure and the second confining structure.