Showing papers by "Leigh T. Canham published in 1996"
TL;DR: Optical waveguiding is demonstrated in porous silicon multilayers by switching between high and low current densities during the anodic etch process as mentioned in this paper, and two-dimensional strip-loaded waveguides have been produced, for both the visible and infrared, by etching into each top layer through a pre-deposited photolithographically defined mask.
201 citations
TL;DR: Porosity has already resulted in significant performance gains, or might do so in the future as mentioned in this paper, and the performance of a variety of porous Si-based discrete optoelectronic devices has been reviewed.
109 citations
TL;DR: In this paper, a broad blue photoluminescence band with nanosecond decay times gradually appears when heavily oxidized porous silicon is stored in ambient air for prolonged periods.
89 citations
68 citations
46 citations
TL;DR: In this article, the response of a range of porous Si and poly Si films to storage in acellular simulated body fluids is summarised and its implications discussed, and it is suggested that the combination of VLSI technology, micromachining and surface microstructuring achievable with silicon, could establish this prominent semiconductor as a very useful biomaterial by the next century.
Abstract: The response of a range of porous Si and poly Si films to storage in acellular simulated body fluids is summarised and its implications discussed. It is suggested that the combination of VLSI technology, micromachining and surface microstructuring achievable with silicon, could establish this prominent semiconductor as a very useful biomaterial by the next century. The ‘biocompatibility’ of a variety of silicon microstructures, and even bulk silicon has received surprisingly little study, but now warrants detailed in-vitro and in-vivo assessment.
14 citations
TL;DR: In this paper, a tutorial review on porous Si is presented, focusing on specific topics from the large knowledge base now available on Si that are deemed relevant to other porous semiconductors beginning to receive study.
Abstract: Porous semiconductors constitute a class of material that exhibit surprising properties, are quite easy to fabricate, but are however fragile, complex, and difficult to characterise. This tutorial review extracts specific topics from the large knowledge base now available on porous Si that are deemed relevant to other porous semiconductors beginning to receive study. It also highlights topics where controversy is now resolved, where problems remain, and where further effort could be focused.
11 citations
TL;DR: In this paper, the effect of chemical thinning of the porous silicon structure on the speed and efficiency of electroluminescent devices, produced by the anodisation of a pn junction in bulk silicon is investigated.
Abstract: The effect of the chemical thinning of the porous silicon structure on the speed and efficiency of electroluminescent devices, produced by the anodisation of a pn junction in bulk silicon is investigated. Thinning of the silicon wires results in an increase in the efficiency but at the expense of a reduction in operating speed. It is demonstrated that the operating speed is limited by the photoluminescence lifetime for small signal excitation. However, for large signals, the electroluminescence can be turned off more than 5 times faster than the photoluminescence lifetime, indicating that this need not necessarily limit device operating speed.
5 citations