CAJ | 학술논문

采用基于赝势平面波基组的密度泛函理论方法,对一系列具有黄铜矿结构的AgGa(S1-xSex)2固溶体的构型、电子结构、线性和二阶非线性光学性质进行了系统研究.结果表明,各固溶体具有类似的能带结构,体系带隙随x值增加而逐渐减小.当所引入的Hartree-Fock交换项贡献为22.56%时,对应的杂化PBE泛函得到的带隙值与实验结果相近.固溶体的各种光学性质,包括折射率、双折射率、反射率、吸收系数和二阶倍频系数等均随着组成的改变呈现出有规律的变化趋势,变化范围介于AgGaS2和AgGaSe2二者之间.因此,利用固溶体光学性质的变化规律,可从中寻找出具有特定光学性能的晶体材料.
채용기우안세평면파기조적밀도범함이론방법,대일계렬구유황동광결구적AgGa(S1-xSex)2고용체적구형、전자결구、선성화이계비선성광학성질진행료계통연구.결과표명,각고용체구유유사적능대결구,체계대극수x치증가이축점감소.당소인입적Hartree-Fock교환항공헌위22.56%시,대응적잡화PBE범함득도적대극치여실험결과상근.고용체적각충광학성질,포괄절사솔、쌍절사솔、반사솔、흡수계수화이계배빈계수등균수착조성적개변정현출유규률적변화추세,변화범위개우AgGaS2화AgGaSe2이자지간.인차,이용고용체광학성질적변화규률,가종중심조출구유특정광학성능적정체재료.
Density functional theory (DFT) based on the plane wave basis set was used to investigate the geometries, electronic structures, and linear and second-order nonlinear optical properties of a series of AgGa(S1-xSex)2 solid solutions with chalcopyrite structures. The compounds showed similar band structures, and band gaps decreased with increasing x value. When 22.56%Hartree-Fock exchange was employed, the solid solution band gaps predicted by hybrid PBE functionals were consistent with experimental values. The optical properties of AgGa(S1-xSex)2 solid solutions, including refractive index, birefringence, reflectivity, adsorption coefficient, and second harmonic generation coefficient, changed regularly with composition. The range of variation was between that for AgGaS2 and AgGaSe2. The results indicated that crystals with specialized optical performances could be designed.