Solar Nanotubes Make Light Work?

I have been reporting on developments in photovoltaic cells for as long as I can remember and there’s always some new technology or fabrication method that’s going to improve upon the woeful efficiency of today’s silicon based solar cells. I’m still waiting and outside the labs most commercial cells still only manage a fairly miserable 20 – 30 percent efficiency, which basically means that during their lifetime very few solar cells ever recover the enormous amount of energy put into their manufacture, let alone live long enough to generate ‘free’ electricity. I have no doubt that one day the problem will be licked and this might just be the development to do it. It’s a rolled up graphene layer nanotube and it’s the brainchild of a team of researchers at Cornell University. The first problem, though, is that it’s tiny, no larger than a DNA molecule, which means you’ll need an awful lot of them to do anything useful. The good news is that it’s very efficient and when exposed to light the tubular structure creates more electrons, and the cylindrical structure makes it easier for them to flow. I know, we’ve been here before so don’t hold your breath, but one day, it will happen, and maybe, just maybe this is where it started…

Yet Another Disc Format?

How much data can you cram onto a CD/DVD sized optical disc? Well, we know CDs manage around 800Mb, DVDs can ramp that up to around 20Gb using both sides and multiple layers, and a two-sided Blu Ray disc manages around 50Gb, but that’s small beer, compared with the new General Electric Holographic Versatile Disc (ugh!) or HVD.

Instead of the reflective pits used on conventional optical discs this uses a ‘microholographic’ process to store data, raising the bar to an impressive 500Gb per disc, enough to store more than 100 DVD movies. Read more