Last year, researchers at Tallinn University of Technology made a semi-transparent window glass/solar cell that simultaneously generates electricity and regulates the building's indoor climate, writes Jako Siim Eensalu, a doctoral student and junior researcher at Tallinn. Last year, researchers at Tallinn University of Technology made a semi-transparent window glass/solar cell that simultaneously generates electricity and regulates the building's indoor climate, writes Jako Siim Eensalu, a doctoral student and junior researcher at Tallinn. Last year, researchers at Tallinn University of Technology made a semi-transparent window glass/solar cell that simultaneously generates electricity and regulates the building's indoor climate, writes Jako Siim Eensalu, a doctoral student and junior researcher at Tallinn University of Technology. The future lies in solar cells that are produced sustainably and last for decades. In order to achieve this – to maintain a high level of performance for many years to come – it is necessary to develop solar cells that are based on robust inorganic absorber layers, a recent Tallinn University of. If solar energy is to become available to more people, smart material choices need to be made. Solar cells. Researchers in Denmark have set a new world record in efficiency for converting sunlight into electricity by using new windows that allow light to pass through while simultaneously generating power.