Yingli Green Energy Holding Company Limited, a leading solar energy company and one of the world’s largest vertically integrated photovoltaic manufacturers, which holds the brand Yingli Solar, announced that it has signed a technology, research and production collaboration agreement with Innovalight, Inc., a privately-held firm selling a platform of silicon ink-based high efficiency solar cell materials and technology. By collaborating with Innovalight, Yingli Green Energy expects to r...