How Does Selenium Function in Xerography?

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Homework Statement



I've not been able to understand the role of Selenium in Xerograper pronters.Plz. if somebody has indepth infos. share.thanks.

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The Attempt at a Solution

 
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This is a pretty basic answer, but I know that selenium is used as a photoconductor and also as part of the print toner that is used to reproduce images put through the copier.
 
Hi tandooricjhicken dear,

I know its overall role but tell me whether Selenium'll be positively charged before being exposed to the image or at the time of exposition?I think it'll be charged statically before printed starts.But what'll be positive charges & negative Aluminium then which're in state of contact.Will static positive charges conduct /mix with negative charges only after absorbing light?Plz. clear me about it.Thanks.
 

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