EXCITONIC EFFECTS IN ELECTROREFLECTANCE OF LEAD IODIDE

被引:91
作者
GAHWILLER, C
HARBEKE, G
机构
[1] Laboratories RCA Ltd., Zurich
[2] Physics Department, University of Illinois, Urbana, IL
来源
PHYSICAL REVIEW | 1969年 / 185卷 / 03期
关键词
D O I
10.1103/PhysRev.185.1141
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The reflectance and electroreflectance spectra of single crystals of lead iodide (PbI2) were measured between 2.2 and 5.0 eV at 4.5 and 77°K, respectively. A Kramers-Kronig dispersion analysis of the data was made, and the real and imaginary parts of the dielectric constant were calculated together with their field-induced modulation. The first three lines of the hydrogenic exciton series associated with the absorption edge are well resolved in reflectivity. In the same energy range, the electoreflectance spectrum is interpreted as the Stark shift of the first exciton line from which the binding energy of the exciton is deduced. In the region of fundamental absorption, the existence of several metastable exciton states gives rise to a new and large contribution to the electroreflectance spectra. © 1969 The American Physical Society.
引用
收藏
页码:1141 / +
页数:1
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