Michael Grätzel

Michael Grätzel (born 11 May 1944) is a German chemist. 
Grätzel is a professor at the École Polytechnique Fédérale de Lausanne where he directs the Laboratory of Photonics and Interfaces. He worked on energy and electron transfer reactions. He co-invented the Grätzel cell in 1988 and created the use of nanomaterials in lithium ion batteries.