a method for producing silicon blocks comprises providing a crucible for receiving a silicon melt , with a base and a plurality of side walls connected to the base , attaching nuclei at least on an inner side of the base of the crucible , the nuclei having a melt temperature , which is greater than the melt temperature of silicon , filling the crucible with the silicon melt , solidifying the silicon melt beginning on the nuclei and removing the solidified silicon from the crucible .