13886
Femtosecond Dynamics of Excitons and Hole - Polarons in Composite P3HT / PCBM Nanoparticles .
 Chemical: P3HT; 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: P3HT; Chemical: PCBM