| 高x值混晶Hg1-xCdxTe光吸收边的压力效应 |
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| 引用本文： | 姜山,朱浩荣,沈学础.高x值混晶Hg1-xCdxTe光吸收边的压力效应[J].物理学报,1989,38(11):1858-1863. |
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| 作者姓名： | 姜山 朱浩荣 沈学础 |
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| 作者单位： | 中国科学院上海技术物理研究所红外物理开放研究实验室 |
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| 摘 要： | 采用金刚石对顶砧高压装置,在0—36kbar流体静压力范围和室温条件下测量了高x值的P型碲镉汞混晶Hg0.3Cd0.7Te光吸收边及其随压力的变化。300K下Hg0.3Cd0.7Te光学能隙的实验值与用经验公式的计算值一致。用最小二乘法拟合不同压力下的实验结果,得到Hg0.3Cd0.7Te能隙的一阶压力系数α=8.7×10-11eV/Pa,与用化学键介电
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| 关 键 词： | 高X值 混晶 光吸收边 压力 |
| 收稿时间： | 1/3/1989 12:00:00 AM |
THE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te |
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| JIANG SHAN,ZHU HAO-RONG,SHEN XUE-CHU and J. SCHILZ.THE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te[J].Acta Physica Sinica,1989,38(11):1858-1863. |
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| Authors: | JIANG SHAN ZHU HAO-RONG SHEN XUE-CHU and J SCHILZ |
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| Abstract: | The absorption edge of p-Hg1-xCdxTe with x = 0.7 has been measured at different pressures in the range of 0-36kbar and room temperature. The experimental energy gap is basically in agreement with the result calculated by empirical formula The first order pressure coefficient of Hg1-xCdx Te obtained by a least square fitting to experimental data under different pressures is a = 8.7×10-11eV/Pa, which can be explained by chemical bond dielectric function theory. The second order pressure coefficient of energy gap has also been obtained experimentally as β= -6.3×l0-13eV/ kbar which is hard to understand theoretically. In addition, a structural phase transition has been found under 34-36kbar. |
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