arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1301.6571cond-mat.mtrl-sci
收藏

辉锑矿、辉锑矿、辉铋矿和胍那华矿的GW准粒子能带结构

GW quasiparticle band structures of stibnite, antimonselite, bismuthinite, and guanajuatite

Marina R. Filip, Christopher E. Patrick, Feliciano Giustino

摘要:

采用G $_0$ W $_0$方法,对辉锑矿族的四种同结构半导体金属硫族化合物A $_2$ B $_3$(A = Sb,Bi,B = S,Se)的准粒子能带结构进行了第一性原理计算.我们进行了广泛的收敛测试,并确定准粒子的结构参数和半核心$d$电子的修正的敏感性。我们的计算表明,所有四个硫属化物表现出直接带隙,如果我们排除一些间接跃迁略低于直接间隙。相对论自旋轨道效应的Kohn-Sham能带结构进行了评估,并包括在准粒子带隙的修正。我们计算的带隙为1.5 eV(Sb $_2$ S $_3$)、1.3 eV(Sb $_2$ Se $_3$)、1.4 eV(Bi $_2$ S $_3$)和0.9 eV(Bi $_2$ Se $_3$)。通过比较我们计算的差距与理想的肖克利-奎塞尔值,我们发现,所有四个硫属化物是有前途的纳米结构的光致发光的光敏剂。

英文摘要:

We present first-principles calculations of the quasiparticle band structures of four isostructural semiconducting metal chalcogenides A$_2$B$_3$ (with A = Sb, Bi and B = S, Se) of the stibnite family within the G$_0$W$_0$ approach. We perform extensive convergence tests and identify a sensitivity of the quasiparticle corrections to the structural parameters and to the semicore $d$ electrons. Our calculations indicate that all four chalcogenides exhibit direct band gaps, if we exclude some indirect transitions marginally below the direct gap. Relativistic spin-orbit effects are evaluated for the Kohn-Sham band structures, and included as scissor corrections in the quasiparticle band gaps. Our calculated band gaps are 1.5 eV (Sb$_2$S$_3$), 1.3 eV (Sb$_2$Se$_3$), 1.4 eV (Bi$_2$S$_3$) and 0.9 eV (Bi$_2$Se$_3$). By comparing our calculated gaps with the ideal Shockley-Queisser value we find that all four chalcogenides are promising as light sensitizers for nanostructured photovoltaics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑