[{"from": "human", "value": "Write solar cell poly dispersity index of given SMILES as a p-type polymer and PC71BM or PCBM. ->  CC1=CC(N(CC(CCCCCC)CCCC)C(C2=C3SC(C4=CC5=C(C(SC(C)=C6)=C6[Si]5(CCCCCCCC)CCCCCCCC)S4)=C2)=O)=C3S1\n"}, {"from": "gpt", "value": " 2.57\n"}]