Plextronics Inc. of Pittsburgh, a company specializing in printed solar, lighting and other organic electronics, has completed its Series B-1 financing round, receiving $14 million to develop its research, development and pilot manufacturing programs. The majority of the funding came from Solvay North American Investments LLC, a member of the Solvay Group, which is headquartered in Brussels, Belgium. Solvay’s $12 million investment makes it the largest minority shareholder of Plextronics.