Photothermal investigation study of porous silicon layer doped lithium

This paper presents a series of experimental pho- tothermal deflection technique (PTD) spectra of porous sili- con layers doped with lithium on crystalline silicon backing (PS/Li) and their numerical analysis. The aim of this work is to investigate the influence of Li doping on the opto-thermal properties (optical absorption, band-gap energy, thermal dif- fusivity and thermal conductivity). Also, we correlate these results with other evaluation studies such as I -V measure- ments and atomic force microscope analysis performed on the material. We observe a red shift of the gap, which can be related to the reduction of crystallite size. Moreover, we no- tice a decrease of thermal properties with the same behavior as electrical conductivity.