Applied Physics Letters · 2009 · 713 citations · 26 references
Natural SciencesMaterials SciencePhysicsCrystal StructureElectronic MaterialsMaterials PhysicsElectronic Band StructureOptical Properties Of SemiconductorsPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsWide Band Gap SemiconductorsAbsorber MaterialsBand GapBand Gap EnergyBand Gap PredictionBand Structure CalculationCrystal Structure-property RelationshipsElectronic Band GapElectronic Band Theory
The structural and electronic properties of Cu2ZnSnS4 and Cu2ZnSnSe4 are studied using first-principles calculations. We find that the low energy crystal structure obeys the octet rule and is the kesterite (KS) structure. However, the stannite or partially disordered KS structures can also exist in synthesized samples due to the small energy cost. We find that the dependence of the band structure on the (Cu,Zn) cation ordering is weak and predict that the band gap of Cu2ZnSnSe4 should be on the order of 1.0 eV and not 1.5 eV as was reported in previous absorption measurements.
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