Abstracts Book - IMRC 2018

• SC6-P002
FREQUENCY DOMAIN PHOTOACOUSTIC TECHNIQUE AND THE
TWO LAYERS MODEL: THERMAL CONDUCTIVITY AND THERMAL
DIFUSIVITY DETERMINATION OF P-TYPE POROUS SILICON
Lizbeth Luviano 1 , Uriel Nogal 2 , Joel Hernandez 3 , Jose Bruno Rojas Trigos 1 , Ernesto Marin
Moares 1 , José Antonio Calderón Arenas 1 , Ivan Gabriel Férnandez Peña 1
1 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Legaría, IPN,
Instrumentación y caracterización, Mexico. 2 Consejo Nacional de Ciencia y Tecnologia -
CONACYT, Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y
Tecnología Avanzada, Unidad Legaria, Mexico. 3 Consejo Nacional de Ciencia y Tecnologia -
CONACYT, Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y
Tecnología Avanzada, Unidad Legaria., Mexico.
The frequency domain photoacoustic technique (FDPAT) is an important
method for thermal diffusivity determination, which is a thermal parameter that
gives a measure of the heat flow propagates through a medium and it is very
sensitive to the composition and microstructure of materials. In porous
materials, thermal properties depend in addition to, the porous structure and
porosity degree. Here, FDPAT in a heat transmission configuration was used in
order to obtain the values of the effective thermal diffusivity of p-type porous
silicon samples elaborated, by means of electrochemical etching for attack times
10 to 30 min. The two-layer model, based to the concept of effective thermal
resistance for a series two-layer system, was used, together with the results
obtained for the effective thermal diffusivity for each sample, to determinate
the thermal diffusivity and thermal conductivity of porous layer for each sample
as a function of the etching time and the ratio between the thicknesses of the
porous layer to the full sample, and these, the corresponding values of heat
capacity.
Keywords: Photoacustic technique, porous silicon, thermal properties
Presenting authors email: lle-01liz@hotmail.com