researchers at the Fraunhofer Institute for Solar Energy Systems ISE has succeeded, new peak efficiencies for simple to produce large Silicon solar cell to achieve. With respect to the current industry standard advanced cell structures, they could demonstrate that feasible in the near future efficiencies of 20 percent.
More than 80 percent of currently produced solar cells based on crystalline silicon performance. Goal of industry and research is to optimize costs for this workhorse of the photovoltaic further. currently converting the cells on average 14-19 percent of sunlight into electrical energy , the researchers said the 20 percent mark already in sight. The transfer of their results in the production is - parallel to the rapid market development in Germany - the Cost of photovoltaic generated electricity even further. could image ISE Fraunhofer
"We now conclude several development works for crystalline silicon solar cells successfully and achieve results, the world - what it looks like - the industry close to crystalline silicon solar cell with 19.6 percent efficiency are among the best, "says Christian Schmiga, project manager for high-efficiency silicon solar cells at Fraunhofer ISE. The investigated cell structures differ on the one in the type of silicon material, the
is called the base, and the other in the nature of the so-called Emitter, a thin layer, which collects the electrical charge carriers. This is called n-type solar cells, if the base is negative and p-type solar cells, if the base is positive conductive. Here, the emitter is always reversed polarity to the base. "The production of the emitter, we used three different techniques: aluminum alloying and boron diffusion for the p-emitter of our n-type solar cells, and phosphorus-diffusion for the n-emitter p-type of our" solar cells, Christopher Schmiga.
For an n-type silicon solar cell with aluminum-alloy emitter, the researchers now achieved an efficiency record of 19.3 percent. They turned to the emitter forming the simple screen-printing of an aluminum-containing Paste, gefolgt von einem kurzen Hochtemperatur-Feuerschritt an. Ebenfalls für eine n-Typ Siliciumsolarzelle, aber mit einem Bordiffundierten Emitter, dessen Oberfläche durch eine zusätzliche neue Schicht aus Aluminiumoxid (Al2O3) passiviert wird, konnte Armin Richter, Doktorand am Fraunhofer ISE, einen Wirkungsgrad von 19,6 Prozent demonstrieren. Als weiteres wichtiges Ergebnis erzielten die Wissenschaftler für p-Typ Solarzellen mit Phosphor-diffundiertem Emitter und unter Anwendung der am Fraunhofer ISE entwickelten und patentierten Laser-fired-contact (LFC) Technologie 19,6 Prozent Wirkungsgrad. Alle Solarzellen wurden auf 125 x 125 mm2 großen einkristallinen Siliciumscheiben gefertigt. Ein großer Vorteil ist, dass bei der Herstellung no complex alignment or patterning steps are required, what the process flow much easier and faster.
Fraunhofer ISE developed over almost 30 years, new high-efficiency silicon solar cells. Drawing on the latest results of the Freiburg researchers efficiencies above 20 percent for the mass production of silicon solar cells in the near future. Source: Fraunhofer ISE
0 comments:
Post a Comment