Temperature dependence of photoluminescence peaks of porous silicon structures

Abstract

Evaluation of photoluminescence spectra of porous silicon (PS) samples prepared by electrochemical etching is presented. The samples were measured at temperatures 30, 70 and 150 K. Peak parameters (energy, intensity and width) were calculated. The PL spectrum was approximated by a set of Gaussian peaks. Their parameters were fixed using fitting a procedure in which the optimal number of peeks included into the model was estimated using the residuum of the approximation. The weak thermal dependence of the spectra indicates the strong influence of active defects.K e y w o r d s: porous silicon, photoluminescence pectrum, Gaussian peaks, spectra evaluation

Regarding the Optical Properties of Porous Layers Prepared on Si Substrates

“…4, Table 1, and Ref. [6]) with decreasing temperature was not observed. We relate the generation of the photoluminescence signal of standard p-type Si to the SiO x H y compounds covering the structure after its formation and drying.…”