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Research Article

Efficient and 1, 8-diiodooctane-free ternary organic solar cells fabricated via nanoscale morphology tuning using small-molecule dye additive

Shuhua Zhang1,§, Muhammad Naeem Shah1,§, Feng Liu2(), Zhongqiang Zhang1, Qin Hu3, Thomas P. Russell3, Minmin Shi1, Chang-Zhi Li1(), Hongzheng Chen1()
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon MaterialsDepartment of Polymer Science & Engineering, Zhejiang UniversityHangzhou310027China
Department of Physics and AstronomyShanghai Jiaotong UniversityShanghai200240China
Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyCA94720USA

§ Shuhua Zhang and Muhammad Naeem Shah contributed equally to this work.

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Abstract

The ternary strategy for incorporating multiple photon-sensitive components into a single junction has emerged as an effective method for optimizing the nanoscale morphology and improving the device performance of organic solar cells (OSCs). In this study, efficient and stable ternary OSCs were achieved by introducing the small-molecule dye (5E, 5'E)-5, 5'-(4', 4"-(1, 2-diphenylethene-1, 2-diyl)bis(biphenyl-4', 4-diyl))bis(methan-1-yl-1-ylidene)bis(3-ethyl-2-thioxothia zolidin-4-one) (BTPE-Rn) into poly[4, 8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1, 2-b: 4, 5-b']dithiophene-co-3-fluorothieno[3, 4-b]thiophene-2-carboxylate] (PTB7-Th): [6, 6]-phenyl C71 butyric acid methyl ester (PC71BM) blend films processed using a 1, 8-diiodooctane (DIO)-free solvent. The incorporation of BTPE-Rn enhanced the short-circuit current density and fill factor of the ternary OSCs compared with those of binary OSCs. An investigation of the optical, electronic, and morphological properties of the ternary blends indicated that the third component of BTPE-Rn not only promoted the photon utilization of blends through the energy-transfer process but also improved the electron mobility of the blends owing to the fullerene-rich nanophase optimization. More importantly, this ternary strategy of utilizing a small-molecule dye to replace the photounstable DIO additive enhanced the operational stability of the OSCs.

Keywords

ternary organic solar cellenergy transfermobility1, 8-diiodooctane (DIO)-free

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Nano Research
Volume 10 Issue 11,
November 2017
Pages 3765-3774
DOI: 10.1007/s12274-017-1589-0
Cite this article:
Zhang S, Shah MN, Liu F, et al. Efficient and 1, 8-diiodooctane-free ternary organic solar cells fabricated via nanoscale morphology tuning using small-molecule dye additive. Nano Research, 2017, 10(11): 3765-3774. https://doi.org/10.1007/s12274-017-1589-0
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