An investigation of oxidised porous silicon by infrared spectroscopy

White light from annealed porous silicon: Broadband emission from violet to the near infrared

“…3(a-c) ((a) as-anodized PS sample and (b-c) annealed PS). As observed, the bands due to Si-H vibration modes (907-862 and 670-630 cm À 1 ) predominate for as-anodized PS [11,12], while only a small band associated with Si-H (670-630 cm À 1 ) [12] remains for the annealed samples. Furthermore, Si-O-Si (stretching at $ 1100 cm À 1 , bending at $ 800 cm À 1 and rocking at $470 cm À 1 ) modes [11] are clearly detected as well.…”

“…Three main PL components (violet, green and NIR) could be identified. Analysis of the PL and FTIR spectra for samples annealed under different O 2 flow rates shows that the violet and green emissions are originated from oxygen-excess defects in SiO x , while the NIR emission is originated from defects located at c-Si/SiO x interfaces, ascribed tentatively to NBOHC [11,12] in consistency with the observation of the g$ 1.9997 resonance in the EPR spectra [13].…”

Microanalyses on Mo films before and after hydrogen ion irradiation

“…It is found in Fig. 5(a) for the sample before hydrogen ion irradiation that the bands at 571 and 1030 cm 1 are due to SiO 2 , 9 and those at 671 10 and 2050 cm 1 are due to Si-H. 9 The band at 1170 cm 1 is due to Si-O-Si asymmetric stretching mode. 11 These bands come from the substrates.…”

Optical Absorption and Luminescence Study of the Effect of Thermal Treatments on the Porous Silicon Surface

“…In fact this asymmetric band starts to increase for air treated samples at 200'C after the Si-H 2 band (912 cm') vanished [12,13]. Considering these results of PS oxidation in air, the assignment of the 883 cm-' vibration Wavelength (cm') Wavelength (cm-') mode in the samples oxidized in 02 at 1000°C is not straightforward because the hydrogen is expected to be removed as a result of the high temperature involved.…”