thin film solar cells back contact

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hi friends
what is the back contact and how does it work?please give me some usefull links!
 

The back contact is just a metal sheet.
hope it helps :**broken link removed**

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http://m.dailykos.com/stories/1167908

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http://m.dailykos.com/stories/1167908
 
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We develop a back contact monocrystalline thin-film silicon solar cell using the porous silicon process. Laser processes are applied for all structuring steps. Thus no photolithography or other masking techniques are required. A single evaporation step is used to metallize the cell. Laser scribing is used for contact separation. The cell has a planar front surface, an area of 79.2 cm2 and a cell thickness of 30 ¿m. We reach an efficiency of 13.5 %. The open-circuit voltage is 633 mV and the short-circuit current density is 28.7 mA/cm2.
 

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