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Optical properties of pseudomorphic Sn_xGe_(1-x) alloys

机译:伪Sn_xGe_(1-x)合金的光学性质

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Sn_xGe_(1-x) alloys are grown coherent on Ge(001) substreatess by conventional molecular beam epitaxy. The lattice mismatch between Sn_xGe_(1-x) and Ge produces a biaxial compression of the alloy in the plane of the s ubstrate and a uniaxial elongation in the growth direction. The change of E_g resulting from the biaxial compression is modeled with deformation potential theory for coherent Sn_xGe(1-x) on Ge(001) and coherent Sn_xGe_(1-x) on Ge(111). For SnGe_(1-x) on Ge(001), the decrease in the energy band gap due to strain is small, 16 meV for x chemical bounds 0.10, and GAMMA _7 and L_6 shift uniformly. In the case of Sn_xGe(1-x) on Ge(111), GAMMA _7 and L_6 do not shift uniformly; a large uniaxial splitting occurs at L_6, 200 meV for x chemical bounds 0.10. Another interesting result of a uniaxial strain along [111] is the absence of a direct to indirect energy band gap transition for x<0.30. Fourier transform infrared spectroscopy transmission measurements of coherent Sn_xGe_(1-x) on Ge(001) confirm the strain-induced change in the energy band gap is a small effect.
机译:Sn_xGe_(1-x)合金通过常规分子束外延在Ge(001)基体上相干生长。 Sn_xGe_(1-x)与Ge之间的晶格失配会导致合金在基底平面内发生双轴压缩,并在生长方向上产生单轴伸长。对于Ge(001)上的相干Sn_xGe(1-x)和Ge(111)上的相干Sn_xGe_(1-x),使用变形势理论对双轴压缩导致的E_g变化进行建模。对于Ge(001)上的SnGe_(1-x),由于应变引起的能带隙减小很小,对于x个化学界0.10为16 meV,GAMMA _7和L_6均匀移动。在Ge(111)上的Sn_xGe(1-x)情况下,GAMMA _7和L_6不一致。对于x化学界0.10,在L_6,200 meV处发生大的单轴分裂。沿[111]的单轴应变的另一个有趣结果是,对于x <0.30,不存在直接到间接的能带隙跃迁。 Ge(001)上相干Sn_xGe_(1-x)的傅里叶变换红外光谱透射测量结果证明,应变引起的能带隙变化很小。

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