Hello! Here we go! We’re off and running – crowdfunding for a container to for an eco-education hub at our nursery in Woodstock. Help us in the transformation of this space to a community resource for environmental education and hands-on experience: “We have managed to transform this space from a pile of rubble to an abundance of green,” explains Misha Teasdale, Greenpop’s co-founder and Tree-EO. “But we have a bigger vision for it. We want to create an innovative green education hub accessible to everyone, where people can come together to learn, share, and eat. A space where we’ll spread awareness on the importance of trees, of growing our own food, and of taking care of our environment.”
Researchers at Michigan State University have created a fully transparent solar concentrator, which could turn any window or sheet of glass (like your smartphone’s screen) into a photovoltaic solar cell.
According to Richard Lunt, who led the research, the team are confident that the transparent solar panels can be efficiently deployed in a wide range of settings, from “tall buildings with lots of windows or any kind of mobile device that demands high aesthetic quality like a phone or e-reader.”
Scientifically, a transparent solar panel is something of an oxymoron. Solar cells, specifically the photovoltaic kind, make energy by absorbing photons (sunlight) and converting them into electrons (electricity). If a material is transparent, however, by definition it means that all of the light passes through the medium to strike the back of your eye. This is why previous transparent solar cells have actually only been partially transparent — and, to add insult to injury, they usually cast a colourful shadow too.
To get around this limitation, the Michigan State researchers use a slightly different technique for gathering sunlight. Instead of trying to create a transparent photovoltaic cell (which is nigh impossible), they use a transparent luminescent solar concentrator (TLSC). The TLSC consists of organic salts that absorb specific non-visible wavelengths of ultraviolet and infrared light, which they then luminesce (glow) as another wavelength of infrared light (also non-visible). This emitted infrared light is guided to the edge of plastic, where thin strips of conventional photovoltaic solar cell convert it into electricity. [Research paper: DOI: 10.1002/adom.201400103 – “Near-Infrared Harvesting Transparent Luminescent Solar Concentrators”]
Michigan’s TLSC currently has an efficiency of around 1%, but they think 5% should be possible. Non-transparent luminescent concentrators (which bathe the room in colorful light) max out at around 7%. On their own these aren’t huge figures, but on a larger scale — every window in a house or office block — the numbers quickly add up. Likewise, while we’re probably not talking about a technology that can keep your smartphone or tablet running indefinitely, replacing your device’s display with a TLSC could net you a few more minutes or hours of usage on a single battery charge.
The researchers are confident that the technology can be scaled all the way from large industrial and commercial applications, down to consumer devices, while remaining “affordable.” So far, one of the larger barriers to large-scale adoption of solar power is the intrusive and ugly nature of solar panels — obviously, if we can produce large amounts of solar power from sheets of glass and plastic that look like normal sheets of glass and plastic, then that would be big.
The Giant Flag is a legacy project of vast proportions, a celebration of the spirit of South Africa and her people. The aim is to build a giant flag made up of millions of coloured desert cacti and succulents, and a four-megawatt solar field, in an area that was previously completely barren. Effectively viewable from space and the size of 66 soccer fields, The Giant Flag will not only claim its place as a natural wonder, but also as a new model of economic stimulus for previously disadvantaged communities. Job creation, clean energy and tourism come together in a world first green innovation project that’s making change happen in South Africa! Check it out: www.giantflag.co.za