Formation of Nanostructured Layers for Passivation of High Power Silicon Devices

Nanocrystalline porous silicon films, which have been formed by using simple wet electrochemical etching process in HF electrolyte, were applied for passivation of high power silicon diodes. An optimal technology was designed to manufacture a uniform layer of porous silicon over the area of the p-n junction. The 8% increase in the yield was achieved onO100 mm diameter wafers with 69 cells of diodes in each, by using a very simple technology for the formation of porous layer for passivation of high power silicon diodes

Formation of Porous n−A3B5n-A_3B_5 Compounds

Porous layers of $A_3B_5$ compounds were formed on n-type wafers by electrochemical anodic etching. The morphology of nanostructured layers was studied by scanning electron microscopy and atomic force microscopy techniques. The optimal conditions of the formation of porous layers were determined by varying the composition of etching solution, current density and etching time. Large area $(1.5×1.5 cm^2)$ porous layers of uniform porosity were produced by anodization process of n-type $A_3B_5$ semiconductors

Magnetophotonic Response of Three-Dimensional Opals

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher[EN] Three-dimensional magnetophotonic crystals (3D-MPCs) are being postulated as appropriate platforms to tailor the magneto-optical spectral response of magnetic materials and to incorporate this functionality in a new generation of optical devices. By infiltrating self-assembled inverse opal structures with monodisperse nickel nanoparticles we have fabricated 3D-MPCs that show a sizable enhancement of the magneto-optical signal at frequencies around the stop-band edges of the photonic crystals. We have established a proper methodology to disentangle the intrinsic magneto-optical spectra from the nonmagnetic optical activity of the 3D-MPCs. The results of the optical and magneto-optical characterization are consistent with a homogeneous magnetic infiltration of the opal structure that gives rise to both a red-shift of the optical bandgap and a modification of the magneto-optical spectral response due to photonic bandgap effects. The results of our investigation demonstrate the potential of 3D-MPCs fabricated following the approach outlined here and offer opportunities to adapt the magneto-optical spectral response at optical frequencies by appropriate design of the opal structure or magnetic field strength.We warmly acknowledge discussions on the subject with Antonio Garcia Martin and Gaspar Armelles (CNM-CSIC). We acknowledge partial financial support from the CSIC CRIMAFOT (PIF 08-016), the Spanish Government (CONSOLIDER-Nanoselect-CSD2007-00041 and NanoLight.es-CSD20070046, MAT2008-06761-C03, MAT2009-08024, MAT2009-06835-E, MAT2009-07841, and FPI grant to J.M.C), the Generalitat de Catalunya (2009SGR-376, 2009SGR-203, and FI grant to O.P.), the Comunidad de Madrid S-0505/ESP-0200, and the EC FP7 NoE Nanophotonics4Energy-248855.Caicedo, JM.; Pascu, O.; López García, M.; Canalejas, V.; Blanco, Á.; López, C.; Fontcuberta, J.... (2011). Magnetophotonic Response of Three-Dimensional Opals. ACS Nano. 5(4):2957-2963. https://doi.org/10.1021/nn1035872S295729635