First Solar, Inc. announced that Mark Widmar will join as CF), responsible for the company’s global financial operations. Widmar will succeed James Zhu, who has been interim CFO since Jan. 1, 2011. Zhu will retain his role as First Solar’s chief accounting officer. Widmar joins First Solar effective April 4, 2011, from Graftech International Ltd., a leading global manufacturer of advanced carbon and graphite materials, where he was CFO and president of the Engineered Solutions seg...