The US International Trade Commission (ITC) has begun an investigation into tunnel oxide passivated contact (TOPCon) solar products in the US, following a complaint by US thin-film module manufacturer First Solar.

US cadmium telluride (CdTe) thin-film solar manufacturer First Solar is facing a class action lawsuit investigation into its business practices following a downgrade in its stock.

The USPTO has denied three challenges to patents held by US solar manufacturer First Solar pertaining to its production of TOPCon cells.