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Too much sun for Germany

12.04.2011

Germany, which is actively developing solar energy, faced an unexpected problem. Homeowners who put solar panels on their roof not only save on electricity bills, but also receive a hefty subsidy for this expensive technique, which is why many have installed a home solar power plant.

However, it naturally gives the most energy in the middle of the day, when energy consumption is low, since, as a rule, no one is at home. Therefore, during the day, excess energy enters the public grid, and the energy company pays extra to the owner of the house for the generated electricity.

The number of private solar power plants on the roofs is already so large that the network can not cope with the "digestion" of excess energy. By the end of 2011, the total capacity of German solar energy will reach 30 gigawatts, which corresponds to the consumption of the entire country during the weekend.

Grid overload could shut down entire areas, so the Department of Energy is considering slowing down the installation of new solar panels.

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Translucent flexible solar cells 26.12.2013

Hendrik Bolink from the University of Valencia (Spain) and his colleagues experimented with organic compound molecules from methane and ammonia tails, as well as iodine and lead atoms. Spanish physicists have created translucent solar cells based on thin films of an organic analogue of the mineral perovskite, which are highly efficient and can bend, which allows them to be used as a tinted coating for glasses, according to an article in the journal Nature.

In recent years, scientists have created several exotic materials that can increase the efficiency of solar cells by several times. In particular, the attention of physicists is increasingly attracted by the mineral perovskite, whose thin films are semiconductors that convert light energy into electricity well.

Hendrik Bolink from the University of Valencia (Spain) and his colleagues experimented with organic compound molecules from methane and ammonia tails, as well as iodine and lead atoms. Having studied the chemical properties of this substance, the authors of the article came to the conclusion that it is similar in its properties to perovskite and can capture photons of light just as well and convert their energy into electricity.

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Then the scientists packed this film into a "sandwich" of two pieces of conventional organic semiconductors - PCBM and PolyTPD, used in the manufacture of organosilicon photocells, inserted electrodes into it and checked it out. It turned out that their invention absorbed about 12% of the energy of light, which is comparable to the best performance for thin-film solar cells.

The main advantage of the invention of Bolink and his colleagues is that such solar cells are translucent and flexible. Coupled with their microscopic thickness, this allows such photovoltaic cells to be used as glass coatings capable of generating electricity or heat.

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