Band parameters of CdS and CdSe single crystals determined from optical exciton spectra
Band parameters of CdS and CdSe single crystals determined from optical exciton spectra
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由光学激子光谱确定的 CdS 和 CdSe 单晶的能带参数
DOI：
10.1002/pssb.2220910120
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发表时间：
1979
影响因子：
1.6
通讯作者：
M. Senoner
中科院分区：
文献类型：
--
作者：
J. Voigt;F. Spiegelberg;M. Senoner
通过测量1.8K下超薄、高度完整晶体的透射率和反射率，研究了CdS中A、B激子的能谱。这两个系列的激发态都遵循类氢系列，在很好的近似下产生不同的Rydberg R =（28 ± 0.4）和R =（31.3 ± 0.4）meV，而基态相对于该系列在相反方向上移动，δE =-2.2，δE = +0.5 meV，导致激子结合能E = 30.2和E = 30.8 meV，这与相应的里德堡能量不同。这种效应不能归因于单个微扰以不同的方式作用于基态。此外，振子强度的确定。并以准立方模型作了讨论。对于CdSe，激子LO声子相互作用的研究使用的吸收线在不同温度下的线形分析。类似于其他II-VI族化合物，在较高温度下（T > 77 K），这种相互作用是激子吸收光谱的主导作用。
An investigation is made of the energy spectra of A and B excitons in CdS by measuring the transmission and reflectivity of very thin highly perfect crystals at 1.8 K. The excited states of both series follow hydrogen-like series in a good approximation yielding different Rydberg's R = (28 ± 0.4) and R = (31.3 ± 0.4) meV, whereas the ground states are shifted in opposite direction with respect to the series, δE = −2.2, δE = +0.5 meV, resulting in exciton binding energies E = 30.2 and E = 30.8 meV, which are different from the corresponding Rydberg energies. This effect could not be attributed to a single perturbation acting on the ground state in different ways. Moreover, oscillator strengths are determined. A discussion is given in terms of the quasi-cubic model. For CdSe, the exciton-LO-phonon interaction is investigated using a line-shape analysis of the absorption lines at different temperatures. Analogous to other II–VI compounds, at higher temperatures (T > 77 K) this interaction is the dominate one for the exciton absorption spectra.