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The addition of Au / SiO2 core / shell nanospheres to the P3HT : PC60BM - polymer resulted in a 2 . 7 % improvement in PCE , while their addition to a PBDTT - DPP : PC60BM polymer resulted in a 9 . 1 % improvement .
 Chemical: Au; Chemical: SiO2; 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: Au; Chemical: SiO2; Chemical: P3HT; Chemical: PC60BM; Chemical: PBDTT - DPP; Chemical: PC60BM