How alter the energy band -gap of pure ZnO & doped ZnO for optoelectronic applications?
The size influence the bandgap. Doping itself can also influence the a bandgap.
Article Synthesis and testing of ZnO nanoparticles for photo-initiat...
Edge position of ZnO band gap can be altered by doping with various metallic or non-metallic elements like Al, In, Ga,Li, Na, K ,Ag. As the quantity and the variety of dopant are change, the crystallinity ,surface area, transmittance, as well as optical band gap may be change. To altering of optical band gap of doped ZnO , it's necessary to add materials like CNTs,graphene,fullerene,carbon quantum dots .
The ZnO Bandgap change through doping with "X" depends significantly on the Bandgap of the dopant "oxide". The Larger the dopant oxide Bandgap, the larger doped ZnO:X Bandgap will be as it is considered a Bandgap engineering of Zn(c)X(1-c)O given by:
Bandgap[Zn(c)X(1-c)O] ~ c*Bandgap[ZnO] + (1-c)*Bandgap[XO]
There is a bowing factor, but it is neglected for the case of small doping at% (c), which is c(1-c)b
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