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The layered semiconductors Bi2O2Q (Q = S, Se) consists of Bi2O2 layers sandwiched by Q square nets. On the basis of density functional theory calculations, we examined the thermoelectric properties of Bi2O2S, Bi2O2Se as well as hypothetical structure of Bi2O2(S0.5Se0.5) consisting of mixed chalcogen nets. The thermoelectric power factor of Bi2O2S0.5Se0.5 is much greater than those of Bi2O2S and Bi...
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