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Work function of metals: http://hyperphysics.phy-astr.gsu.edu/hbase/tables/photoelec.html#c1

Copper work function - 4.7 eV
Silver work function - 4.73 eV

Silicon work function - 4.26 eV (http://environmentalchemistry.com/yogi/periodic/Ag.html)

The work functions of conductors are comparable to semi-conductors.

Why aren't solar panels made of conductors?