Photoconductivity Relaxation Time in Macroporous Silicon

Observation of time-varying photoconductivity and persistent photoconductivity in porous silicon

Macroporous Silicon: Technology and Applications

Macroporous silicon (MPS) is a versatile material that since its origin in the early 1990s has seen intense research and has found applications in many fields. MPS is a key technology in photonic crystals research, and optic and photonic applications are its main applications. However, this chapter is devoted to several of the non-photonic uses of MPS. In particular, new electronic and MEMS dev...

NonUnear subgap photoconductivity of polycrystamne silicon

The photoconductance of poiycrystaHine silicon films at photon energies smaller than the band gap has been measured as a function of intensity applying a 1.3 pm wavelength semiconductor laser. The observed photosignaI increases superlinearly at low intensities and saturates above about 1.5 W / em 2. This distinct nonlinearity is caused by a significant energy dependence of optical to thermal cr...

SERS-Active Substrate Based on Macroporous Silicon

Novel architectures with nanometric are very promising as building blocks for future nanotechnological applications. Metallic substrates with ordered morphology have been shown to be very effective for surface-enhanced Raman scattering (SERS). The sensitivity of detection is increased by several orders of magnitude by using this technique. In this paper we investigate SERS on thermal evaporated...

Pushing the limits of macroporous silicon etching

We present a detailed investigation of the fabrication of almost perfect three-dimensional microstructures grown by a photoelectrochemical etching process. The focus is directed on the physical effects that have limited the achievable pore shapes to very smooth modulations. These limits can be overcome by an improved etching process allowing strongly modulated three-dimensional networks. In par...