Business Green: German solar cell start-up Heliatek GmbH has announced that it has secured EUR18m (£16m) through a second round of financing that will allow it to begin work on a manufacturing facility near its Dresden headquarters. The company, which was founded in 2006 as a spin-off from the Universities of Dresden and Ulm, specialises in the development of so-called organic solar cells that use carbon and other organic materials to create dyes that convert sunlight to electricity. Advocates …