摘要
采用基于密度泛函理论(DFT)的第一性原理方法,在广义梯度近似(GGA)框架下,研究了纯净闪锌矿ZnS-B3和Na掺杂ZnS后的晶体结构、电子结构和光学性质。详细分析了不同Na掺杂浓度对ZnS的晶格常数、电子态密度和能带结构的影响,讨论了费米能级附近的电子组态对ZnS光学性质的影响。结果表明,掺杂Na对ZnS光学性能有极大的影响,当Na离子掺杂浓度为6.25%(原子分数)时,表现出较好的综合光学性质;当掺杂浓度为12.5%(原子分数)时,体系有效负电荷离子浓度增加,S3p态穿过费米能面,引起S3p态电子产生跃迁,在低能量红外区域产生新介电峰,引起光吸收,降低了ZnS材料的透红外性能。理论预测结果与文献报道的实验结果相吻合。
The crystal structures,electronic structures and optical properties of Na doping zincblende （ZnS-B3） system （Zn（1 -x ）Nax S （x =0,0.0625,0.125））were calculated by using first-principles calculation based on the density functional theory （DFT）within the framework of generalized gradient approximation （GGA）.The equilibrium lattice constant,electronic structure including the density of state and band structure of Zn（1 -x ） Nax S （x =0,0.0625,0.125 ）were discussed in detail.The effects of the electron configuration around Fermi level on optical properties of Na doped-ZnS materials were analysized theoretically.The calculated results re-vealed that Na doping played an important role in the optical properties of ZnS-B3.The Na2 S doped-ZnS materi-als showed good comprehensive optical properties when the doping concentration of Na＋ ion was at 6.25at%, while the concentration of effective negative charge increases when the doping concentration of Na＋ ion was at 12.50at%,and the S3p electron stateed cross the Fermi-level and transited to high energy level.New dielectric peak presented in infrared spectra with low energy level and increased the light absorption coefficient,thus de-creased the transmission coefficient of ZnS materials.Present calculated results agree considerably with the ex-periment results in available literatures.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2014年第1期38-43,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50971043
51171046)
关键词
ZnS红外材料
电子结构
光学性质
第一性原理计算
ZnS infrared materials
electronic structures
optical properties
first-principles calculations
