29633
For the P3HT : PC60BM polymer with a band edge of ~ 700 nm , the addition of the core / shell nanorods with an aspect ratio ( AR ) of ~ 2 . 5 ( extinction peak ~ 670 nm ) resulted in a 7 . 1 % improvement in PCE , while for the PBDTT - DPP : PC60BM polymer with a band edge ~ 860 nm , the addition of core / shell nanorods with an AR of ~ 4 ( extinction peak ~ 830 nm ) resulted in a 14 . 4 % improvement in PCE .
 Chemical: P3HT; Chemical: PC60BM; Chemical: PBDTT - DPP; Chemical: PC60BM
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: PC60BM; Chemical: PBDTT - DPP; Chemical: PC60BM