SA university developing see-through solar PV for homes, phones and cars

A new type of clear glass for windows which also acts as a solar panel to capture the sun’s energy for buildings, mobile phones and electric cars is set to emerge from a joint study between the University of the Free State and a university in Belgium.

Lucas Erasmus (left) and Prof. Hendrik Swart.

A revolutionary new type of window glass – in effect a transparent solar panel – is the objective of joint research being done by the University of the Free State (UFS) and Ghent University in Belgium.

A working model has been created which proves the viability of the process which now needs to be refined, made more efficient and brought to the market. It is hoped to achieve this within a decade. This new product will have the capacity to revolutionise the generation of power cheaply from the sun to power homes, factories and cities in a new clean way.

Academics from UFS, Prof. Hendrik Swart and Lucas Erasmus are doing joint research with Ghent University to find solutions for energy production. The two universities entered into an agreement recently for this research into electricity generation. The research is driven by UFS and was prompted by ever-rising electricity prices and growing demand for electricity production. South Africa lives with constant power outages which leaves people stuck in lifts and facing chaos on the roads as traffic lights fail. Many people who can afford them, now rely on generators.

Prof. Swart, senior professor in the Department of Physics at UFS and SARCHI chair (South African Research Chairs Initiative) in solid state luminescent and advanced materials, says: “An innovation like this which can help to replace traditional means of carbon based fuel for power generation in our daily lives would be hugely welcome.”

Prof. Swart says the main objective of the research is to develop glass which is transparent to visible light, just like the glass you find in the windows of buildings, motor vehicles and mobile electronic devices. However, by incorporating the right phosphor materials inside the glass, the light from the sun which is invisible to the human eye (ultraviolet and infrared light) can be collected, converted and concentrated to the sides of the glass panel where solar panels can be mounted. This invisible light can then be used to generate electricity to power buildings, vehicles and electronic devices. the goal is therefore to create a type of transparent solar panel, he says.

According to Prof. Swart, this technology can be implemented in the building environment to meet the energy demands of the people inside the buildings. “The technology is also good news for the 4,7-billion cell phone users in the world, as it can be implemented in the screens of cell phones, where the sun or the ambient light of a room can be used to power the device without affecting its appearance,” he says. Another possible application is in electric cars, where the windows can be used to help power the vehicle.

Lucas Erasmus, who is working with Prof. Swart,  says that they are also looking at implementing this idea into hard, durable plastics which can act as a replacement for zinc roofs. This would allow visible diffused light to enter houses and the invisible light could then be used to generate electricity. The device also concentrates the light from a large area to the small area on the sides where the solar panels are placed; therefore, reducing the number of solar panels needed and in return, reducing the cost, Erasmus says.

It is envisaged that the technology will take about a decade to refine and implement. This study is currently on-going, and UFS is experimenting and testing different materials in order to optimise the device in the laboratory. It then needs to be upscaled in order to test it in the field. “It is truly the techno­logy of the future,” says Erasmus.

UFS envisages that the end result of this research will provide an attractive solution to address the energy demands of buildings, electric vehicles and mobile electronics without affecting their appearance.

According to Prof. Swart, the agreement entails a joint doctoral degree in which both universities will supervise the project and the awarding of the doctorate. Erasmus, a student at UFS, has been tasked with the assignment to conduct research at both institutions.

Contact University of the Free State, Tel 051 409-9111,

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Source: EE plublishers