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creation of charge carriers (e-h pairs) within the PV device, and
(c) separation of (e-h) pairs before their recombination — in
order to (d) pass through an external circuit to create useful
power.Toachievethesefourfunctionssimultaneously,anelectronic
device containing a suitable interface with a built-in electric field
is necessary. Such an interface can be an MS Schottky contact, a
p-n homo-junction, a p-n hetero-junction, an n-n hetero-junction,
or a p-p hetero-junction. MS and p-n junctions can be further
modified to form MIS and p-i-n junctions respectively to enhance
theirperformance.Toproduceane
cientPVsolarcell,twoormore
interfaces mentioned above can be combined to form one solar cell
structure. The graded bandgap multi-layer solar cell structures are
thewayforwardtoimprovingsolarenergyconversioninthefuture.
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