1256
A photovoltaic device with a composite film prepared from a POT - co - DOT / C ( 60 ) = 2 : 1 suspension showed 10 times larger short - circuit current density and 5 times larger power conversion efficiency than a device with pure POT - co - DOT , although further work is required to improve the device performance .
 Chemical: POT - co - DOT; Chemical: C ( 60 ); Chemical: POT - co - DOT
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: POT - co - DOT, C ( 60 ), POT - co - DOT 
Answer:
 Chemical: POT - co - DOT; Chemical: C ( 60 ); Chemical: POT - co - DOT