Plextronics Inc., a Pittsburgh-based developer of active-layer technology for printed electronic devices, has raised $20.6 million in Series B funding. The Solvay Group led the deal with a $10 million infusion, and was joined by return backers Firelake Capital, Birchmere Ventures, Draper Triangle Ventures and Newlin Investment Company. Plextronics now has raised a total of $37 million in private funding since its inception five years ago. www.plextronics.com