Purity of Polycrystalline Solar Cells vs Monocrystalline Solar Cells

[cemtu]

Homework Statement

Why is the silicon purity of polycrystalline Solar Cells lower than monocrystalline Solar Cells?

Relevant Equations

No equations

Why is the silicon purity of polycrystalline Solar Panels lower than monocrystalline Solar Panels?

In monocrystalline silicon or single crystalline silicon one can observe long range order this leads to greater scope to move electron without any collisions so that conversion efficiency that is solar to electrical energy efficiency will be very high and material will be continuous and edges can be cut cleanly where as above said all are not possible in polycrystalline silicon or multycrystalline silicon.So, in view of conversion efficiency one has to prefer the monocrystalline silicon where as by keeping cost in view then we have to prefer polycrystalline silicon for solar panels.

I have read this explanation somewhere in the internet but not sure if it is correct?
Can somebody give me an explanation please?

 

[berkeman]

How are you defining "purity"?