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Issue 15, 2020
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Over 14% efficiency nonfullerene all-small-molecule organic solar cells enabled by improving the ordering of molecular donors via side-chain engineering

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Abstract

Improving the short-circuit current density (Jsc) is a big challenge for gaining highly efficient nonfullerene all-small-molecule organic solar cells (NFASM-OSCs). Herein, a novel small molecular donor, BT-2F which is derived from previously reported BTEC-2F, was designed and synthesized. The shortened alkyl-chains with higher regularity endow BT-2F with more ordered packing arrangement and more compact lamellar stacking as evidenced by the characterization of differential scanning calorimetry and grazing incidence X-ray diffraction. By blending BT-2F with Y6 or N3, BT-2F based devices showed impressive power conversion efficiencies (PCEs) of 13.80% and 14.09% respectively, much higher than the reported PCE of 13.34% for BTEC-2F:Y6. Besides, the efficiency of 14.09% is also among the highest PCE values reported so far for NFASM-OSCs. The distinctly improved Jsc resulted in enhanced PCE values, meanwhile both BT-2F:Y6 and BT-2F:N3 still maintain high fill factors of over 70%, which are ascribed to the good balance between high crystallinity and appropriate phase separation.

Graphical abstract: Over 14% efficiency nonfullerene all-small-molecule organic solar cells enabled by improving the ordering of molecular donors via side-chain engineering

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Supplementary files

Article information


Submitted
17 Feb 2020
Accepted
19 Mar 2020
First published
20 Mar 2020

J. Mater. Chem. A, 2020,8, 7405-7411
Article type
Paper

Over 14% efficiency nonfullerene all-small-molecule organic solar cells enabled by improving the ordering of molecular donors via side-chain engineering

J. Gao, J. Ge, R. Peng, C. Liu, L. Cao, D. Zhang, B. Fanady, L. Hong, E. Zhou and Z. Ge, J. Mater. Chem. A, 2020, 8, 7405
DOI: 10.1039/D0TA01893G

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