The Pyradian solar cell

The engineering principles developed by NLV Solar AG in computer models are now being applied and fine-tuned in physical prototypes. One of the first applications to take the step from virtual to real will be the Pyradian solar cell, based on a modified iron-sulphur composite semiconductor.

Composites of iron and sulphur have been considered in the past for use in photovoltaic cells, mainly for their good absorption qualities. The naturally occurring iron-sulphur compound, pyrite (iron disulphide or FeS2), has several inherent problems – such as high resistance and surface currents – which are only now being overcome.

NLV Solar AG has developed an iron-sulphur composite semiconductor using digital prototyping, with very promising results. The research indicates unique properties which include an average photovoltaic conversion efficiency of 38% and a peak performance of over 50%. As a multilayer thin-film cell the material could be applied to substrates in a transparent or tinted coating.

The cell that is to be built on these unique properties is called the Pyradian solar cell. NLV Solar AG holds worldwide patents on the modified iron-sulphur composite semiconductor. The patents also cover the modification process, involving doping with boron and phosphorus, and the software that controls it.