Progress in solar technologies – from research to application
EU group project presents its results: high efficiencies with less material
A workshop entitled "European Solar Technology Forum – from Research to Industrial Application" took place at HZB to conclude of the European CHEETAH project on November 30, 2017. More than 100 participants from the most important European research institutes in the field of photovoltaics and from numerous universities came together with representatives from industry in order to discuss the progress achieved by CHEETAH.
Three different types of soclar cells have been greatly improved:
Silicon photovoltaics: wafer thickness cut by half
Efforts in the field of silicon photovoltaics have been directed towards the use of ever-thinner wafers in manufacturing photovoltaic modules. Several modules whose cells were 90-100 microns thick were presented at the workshop. These enable considerable savings in materials compared to standard modules with cell thicknesses of 180 microns.
Reducing material consumption in chalcopyrite solar cells by implementing an integrated lens system.
The approach to saving materials in thin-film solar cells made of chalkopyrites (Cu(In,Ga)Se2) was different: the cells were reduced in area and an integrated lens system incorporated into the module to concentrate the sunlight irradiating the cells. The goal is to achieve an efficiency level at least as high as that of current commercial modules while using considerably less material. The first prototypes already demonstrate that the method works in principle and can even reach higher efficiency levels than standard cells under certain circumstances due to the higher light intensity.
Extending the operating life of hybrid solar cells
The third topic in CHEETAH involved organic and hybrid solar cells. In this part of the project, polymer encapsulation materials were measured in an extensive series of tests and correlated with the operating life of the cells. The operating life of these solar cells could be increased to several years using the best of these polymers.
The presentations can be viewed here
- The BIPV living lab at the centre of an international comparative studyThe BIPV living lab at HZB in Berlin-Adlershof is at the centre of an international comparative study for the simulation of coloured solar façades.
- The twisted nanotubes that tell a storyIn collaboration with scientists in Germany, EPFL researchers have demonstrated that the spiral geometry of tiny, twisted magnetic tubes can be leveraged to transmit data based on quasiparticles called magnons, rather than electrons.
- Bright prospects for tin perovskite solar cellsPerovskite solar cells are widely regarded as the next generation photovoltaic technology. However, they are not yet stable enough in the long term for widespread commercial use. One reason for this is migrating ions, which cause degradation of the semiconducting material over time. A team from HZB and the University of Potsdam has now investigated the ion density in four different, widely used perovskite compounds and discovered significant differences. Tin perovskite semiconductors produced with an alternative solvent had a particular low ion density — only one tenth that of lead perovskite semiconductors. This suggests that tin-based perovskites could be used to make solar cells that are not only really environmentally friendly but also very stable.