What is Michael Grätzel?
{{Infobox scientist | name = Michael Grätzel | image = Michael Grätzel.jpg | birth_date = {{Birth date and age|1944|5|11|df=y}} | birth_place = [[Dorfchemnitz]], [[Sachsen]] | death_date = | death_place = | nationality = Swiss | alma_mater = [[Freie Universität Berlin]] | doctoral_students = | notable_students = [[Henry Snaith]] (postdoc)<ref name=snaith/><ref>{{Cite journal | author = Anon | doi = 10.1038/504357a| title = 365 days: Nature's 10, Ten people who mattered this year| journal = [[Nature (journal)|Nature]]| volume = 504| issue = 7480| pages = 357–365| year = 2013| pmid = 24352276| s2cid = 4463808}}</ref> | known_for = [[Dye-sensitized solar cells]] | website = {{URL|http://lpi.epfl.ch/graetzel}} | footnotes = | field = [[photochemistry]] | work_institution = [[École Polytechnique Fédérale de Lausanne]] | prizes = [[Harvey Prize]] {{small|(2007)}}<br />[[Balzan Prize]] {{small|(2009)}}<br />[[Millennium Technology Prize]] {{small|(2010)}}<br />[[Albert Einstein World Award of Science]] {{small|(2012)}}<br />[[Marcel Benoist Prize]] {{small|(2013)}}<br />[[King Faisal International Prize]] {{small|(2015)}}<br />[[Global Energy Prize]] {{small|(2017)}} | religion = }} '''Michael Grätzel''' (born 11 May 1944)<ref>Pete Pokkinen: Huippututkija harkitsi nuorena pianistin uraa. Helsingin Sanomat, 10.6.2010, p. B7. (in Finnish)</ref> 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 [[nanomaterial]]s in [[lithium ion]] batteries.<ref name=snaith>{{Cite journal | doi = 10.1021/nl071656u| title = Efficiency Enhancements in Solid-State Hybrid Solar Cells via Reduced Charge Recombination and Increased Light Capture| journal = [[Nano Letters]]| volume = 7| issue = 11| pages = 3372–3376| year = 2007| last1 = Snaith | first1 = H. J. | author-link1 = Henry Snaith| last2 = Moule | fi