A study of the optical absorption in CdTe by photoacoustic spectroscopy
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We show that the Photo-Acoustic Spectroscopy (PAS) is an useful alternative method for the determination of the optical-absorption coefficient of CdTe thin films, in the spectral region near to the fundamental absorption edge, ranging from 1.0 eV to 2.4 eV, using an open cell in the transmission configuration. We applied this method to the optical characterization of CdTe layers for several values of their thickness. These CdTe samples were deposited by closed-space vapor transport (CSVT) technique under different growth conditions.
KeywordsFundamental Absorption Edge CdTe Layer Photoacoustic Spectroscopy Absorption Length CdTe Film
This work was partially supported by Consejo Nacional de Ciencias y Tecnología (CONACyT-México). ES also thanks to the MEK of Spain for the fellowship AP2003–1388.
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