| Autor: |
de Albuquerque, J. E., de Oliveira, P. M.S., Ferreira, S. O., de Albuquerque, J. E., de Oliveira, P. M.S., Ferreira, S. O. |
| Zdroj: |
Journal de Physique IV - Proceedings; June 2005, Vol. 125 Issue: 1 p169-171, 3p |
| Abstrakt: |
In this study, photopyroelectric spectroscopy was used to obtain thermal and optical properties of CdTe in the $300<\lambda<1200$nm wavelength range, where λis the wavelength. The normalized photopyroelectric intensity signal $V_n(\lambda)$and its phase $f_n(\lambda)$were independently measured, as well as the intensity Vn(f) and the phase Fn(f) (fbeing the chopping frequency) for a given λof the saturation part of the PPES spectrum. Equations of both the intensity and the phase of the PPES signal, taking into account the thermal and the optical characteristics of the pyroelectric (PVDF) detector, were used to fit the experimental results. From the fitting in the graph Fn(f) versus f1/2, we obtained, with great accuracy, the value of thermal diffusivity coefficient α. From the fitting in the graph Vn(f) versus f, we obtained the thermal conductivity k.The specific heat cof the sample is then directly derived from the relation $k=\rho c\alpha$, where ρ is the mass density, valid for a stationary state. From the fittings in the graphs $V_n(\lambda)$versus λand $f_n(\lambda)$versus λ, we obtained the optical absorption coefficient and the optical gap of the CdTe. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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