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Adv Mater. 2017 Nov;29(42). doi: 10.1002/adma.201703777. Epub 2017 Sep 29.

Improved Domain Size and Purity Enables Efficient All-Small-Molecule Ternary Solar Cells.

Zhang H1,2, Wang X3, Yang L1,2, Zhang S1, Zhang Y1,2, He C1,2, Ma W3, Hou J1,2.

Author information

1
State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
2
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
3
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.

Abstract

An all-small-molecule ternary solar cell is achieved with a power conversion efficiency of 10.48% by incorporating phenyl-C71 -butyric-acid-methyl ester (PC71 BM) into a nonfullerene binary system. The addition of PC71 BM is found to modulate the film morphology by improving the domain purity and decreasing the domain size. This modulation facilitates charge generation and suppresses charge recombination, as manifested by the significantly enhanced short-circuit current density and fill factor. The results correlate the domain characteristics with the device performance and offer new insight from the perspective of morphology modulation for constructing efficient ternary devices.

KEYWORDS:

domain purity; nonfullerene; organic solar cells; small molecules; ternary solar cells

PMID:
28961342
DOI:
10.1002/adma.201703777

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