CdTe surface roughness by Raman spectroscopy using the 830 nm wavelength.
A Raman spectroscopic study was performed to detect the surface roughness of a cadmium telluride (CdTe) wafer sample, using the 514.5, 632.8 and 830.0 nm excitations wavelengths. To verify the relation between the roughness and the structure of Raman spectra, in certain zones of the sample, we measured their roughness with an atomic force microscopy. It was found that, using the 830 nm wavelength there is a direct correspondence between the spectrum structure and the surface roughness. For the others wavelengths it was found, however, that there is not a clearly correspondence between them. Our results suggest that, using the excitation wavelength of 830 nm the Raman spectroscopy can be used as an on-line roughness monitor on the CdTe growth.
Frausto-Reyes
C
C
Centro de Investigaciones en Optica A.C., Unidad Aguascalientes, Prolong., Constitución 607, Fracc. Reserva Loma Bonita, C.P. 20200, Apartado Postal 507, Ags., México. cfraus@cio.mx
Molina-Contreras
J Rafael
JR
Medina-Gutiérrez
C
C
Calixto
Sergio
S
D019187:Cadmium Compounds / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D013691:Tellurium / Q000737:chemistry*
D019187:Cadmium Compounds; D013691:Tellurium; C028337:cadmium telluride