Semprius raises $20.6 million

Semprius has raised $20.6 million in equity funding, the Durham company reported in a regulatory filing Thursday.

Last week, Semprius announced that corporate giant Siemens had acquired a 16 percent stake in the company, which is developing next-generation solar devices. Terms of that investment weren't disclosed.

Semprius CEO Joe Carr declined to say whether the $20.6 million included the Siemens investment. He said the company would release more detailed information about the funding next week.

Semprius is also seeking to raise an additional $9.3 million in equity funding, according to the filing with the Securities and Exchange Commission. The capital will be used to build a plant to manufacture Semprius' solar cells.