Bandgap energies and refractive indices of Pb1−xSrxSe
Bandgap energies and refractive indices of Pb1−xSrxSe
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DOI：
10.1063/1.1637725
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发表时间：
2004-01
影响因子：
3.2
通讯作者：
A. Majumdar;H. Xu;F. Zhao;J. Keay;L. Jayasinghe;S. Khosravani;X. Lu;V. Kelkar;Z. Shi
中科院分区：
文献类型：
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作者：
A. Majumdar;H. Xu;F. Zhao;J. Keay;L. Jayasinghe;S. Khosravani;X. Lu;V. Kelkar;Z. Shi
通过分子束外延生长的Pb1−xSrxSe样品，在不同的Sr组成(x)范围为0 ~ 1的情况下，进行了光透射测量。通过拟合透射率数据，计算了室温和77 K下各样品的折射率。通过直接跃迁和间接跃迁的理论模型拟合吸收系数，计算了各组分的带隙能。在Sr组成约为x=0.20时，观察到从直接到间接的明显带隙反转。根据实验结果计算出SrSe的直接带隙为3.81 eV，间接带隙为1.82 eV。
Optical transmission measurements were carried out on Pb1−xSrxSe samples, grown by molecular beam epitaxy, with different Sr compositions (x) ranging from 0 to 1. Refractive indices were calculated for all the samples at room temperature and at 77 K by fitting the transmittance data. Bandgap energies of all compositions were calculated by fitting the absorption coefficients to theoretical models of direct and indirect transitions. A distinct bandgap inversion from the direct to the indirect was observed at a Sr composition of approximately x=0.20. The direct and indirect bandgaps of SrSe calculated from the experimental results were found to be 3.81 and 1.82 eV, respectively.