TY - JOUR
T1 - Fused nonacyclic electron acceptors for efficient polymer solar cells
AU - Dai, Shuixing
AU - Zhao, Fuwen
AU - Zhang, Qianqian
AU - Lau, Tsz Ki
AU - Li, Tengfei
AU - Liu, Kuan
AU - Ling, Qidan
AU - Wang, Chunru
AU - Lu, Xinhui
AU - You, Wei
AU - Zhan, Xiaowei
N1 - Funding Information:
X.Z. wish to thank the 973 Program (No. 2013CB834702) and the NSFC (No. 91433114). T.L. and X.L. acknowledge the financial support from RGC of Hong Kong GRF (No. 14303314) and CUHK Direct Grant (No. 4053128). Q.Z., and W.Y. were supported by the Office of Naval Research (No. N000141410221) and NSF (No. DMR-1507249).
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/1/25
Y1 - 2017/1/25
N2 - We design and synthesize four fused-ring electron acceptors based on 6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b;2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0-2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550-850 nm) and strong absorption with high extinction coefficients of (2.1-2.5) × 105 M-1 cm-1. Fluorine substitution downshifts the LUMO energy level, red-shifts the absorption spectrum, and enhances electron mobility. The polymer solar cells based on the fluorinated electron acceptors exhibit power conversion efficiencies as high as 11.5%, much higher than that of their nonfluorinated counterpart (7.7%). We investigate the effects of the fluorine atom number and position on electronic properties, charge transport, film morphology, and photovoltaic properties.
AB - We design and synthesize four fused-ring electron acceptors based on 6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b;2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0-2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550-850 nm) and strong absorption with high extinction coefficients of (2.1-2.5) × 105 M-1 cm-1. Fluorine substitution downshifts the LUMO energy level, red-shifts the absorption spectrum, and enhances electron mobility. The polymer solar cells based on the fluorinated electron acceptors exhibit power conversion efficiencies as high as 11.5%, much higher than that of their nonfluorinated counterpart (7.7%). We investigate the effects of the fluorine atom number and position on electronic properties, charge transport, film morphology, and photovoltaic properties.
UR - http://www.scopus.com/inward/record.url?scp=85017094193&partnerID=8YFLogxK
U2 - 10.1021/jacs.6b12755
DO - 10.1021/jacs.6b12755
M3 - Journal article
C2 - 28059503
AN - SCOPUS:85017094193
SN - 0002-7863
VL - 139
SP - 1336
EP - 1343
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 3
ER -
