About: http://webisa.webdatacommons.org/252217549

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Photovoltaic cells are made of two thin layers of material, one (is made )of a semiconducting material such as silicon, the other (is made) of a metal such as aluminum or silver
http://www.w3.org/ns/prov#wasQuotedFrom	gmatclub.com