21603
n - Doping of solution - processible organic semiconductors : highly conductive fullerenes are demonstrated through solution - processed fulleropyrrolidinium iodide ( FPI ) and FPI - doped PCBM to reach a high conductivity ( 3 . 2 S / m ) .
 Chemical: fullerenes; Chemical: fulleropyrrolidinium iodide; Chemical: FPI; Chemical: FPI; Chemical: PCBM
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fullerenes; Chemical: fulleropyrrolidinium iodide; Chemical: FPI; Chemical: FPI; Chemical: PCBM