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Photoluminescence spectra of a series of MBE-grown Hg1-xCdxTe samples with the same mole fraction of about x≈0.39 have been measured at different temperatures from 5 to 100 K. By aid of the temperature and exciting laser power dependence of photoluminescence peak energy and relative intensity, as well as of the comparison with other measurements, four main structures dominating in the photoluminescence spectra are attributed to band to band, DoX, AoX and DoAo transitions. A deep donor state level located at about 8.5meV below the bottom of the conduction band has been observed and is determined to be due to the arsenic-occupied mercury vacancies. Two acceptor levels located at about 14.5 meV and about 31.5 meV above the top of the valance band have also been found from the measuements, which are identified as the mercury vacancies and As in anion site, respectively. 相似文献
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HgCdTe epilayers were grown by molecular beam epitaxy on GaAs(211)B substrates. Process of the HgCdTe epitaxial growth can be monitored by reflection high-energy electron diffraction. Results of the infrared transmission spectrum, Raman scattering spectrum and infrared photoluminescence spectrum in magnetic field have been studied. 相似文献
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本文报道了对具有高浓度衬底的P型Pb_(0.8)Sn_(0.2)Te液相外延层(P-Pb_(0.8)Sn_(0.2)Te/p~+-Pb_(0.8)Sn_(0.2)Te),用红外光谱仪测量的实验反射光谱以及用解光导纳方程的方法所获得的计算反射光谱,然后用曲线拟合技术修改参数,使计算光谱与实验光谱一致,最后得出在这样的外延层中载流于浓度的分布具有如下形式:log P=az~2+bz+ c.P为载流子浓度,|z|为外延层内各截面到衬底之距离,a,b,c为常数且均大于零. 相似文献
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在p-型HgTe/CdTe超晶格材料上制作金属-绝缘体-半导体(MIS)结构.报道了HgTe/CdTe超晶格的分子束外延生长、器件制作和测量结果.研究表明,比较宽的CdTe势垒阻碍了少子(电子)到界面的迁移,在77K强反型区域的低频电容不能达到绝缘层电容,类似于普通MIS器件的高频C—V曲线. 相似文献
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用X射线衍射并结合X射线动力学衍射理论模型的计算机模拟方法,对简单和复杂两种结构的(CdTe-ZnTe)/ZnTe/GaAs(001)应变超晶格材料的结构和完整性进行了研究,得到了它的结构参数. 相似文献
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应用于THz辐射的ZnTe单晶生长及测试 总被引:1,自引:0,他引:1
利用Te溶剂方法生长出ZnTe单晶.经X射线衍射测试,发现晶锭中存在沿(110)晶向生长的大晶粒,可以切出10mm×10mm的单晶片.傅里叶红外变换光谱仪测得ZnTe晶体在2.5~20μm波段的红外透过率约为61%.通过测可见-红外波段的透射光谱,得出禁带宽度为2.24eV.利用飞秒激光作用在一块ZnTe单晶同时产生-探测THz脉冲,观察到0.18ps的THz辐射场分布,相应的频谱分布为5THz. 相似文献
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