Understanding the Impact of Hierarchical Nanostructure in Ternary Organic Solar Cells

Fang, Jin; Wang, Zaiyu; Zhang, Jianqi; Zhang, Yajie; Deng, Dan; Wang, Zhen; Lu, Kun; Ma, Wei; Wei, Zhixiang

doi:10.1002/advs.201500250

Title: Understanding the Impact of Hierarchical Nanostructure in Ternary Organic Solar Cells

Journal Article · Wed Sep 02 00:00:00 EDT 2015 · Advanced Science

DOI:https://doi.org/10.1002/advs.201500250· OSTI ID:1623466

Fang, Jin ^[1]; Wang, Zaiyu ^[2]; Zhang, Jianqi ^[3]; Zhang, Yajie ^[3]; Deng, Dan ^[1]; Wang, Zhen ^[3]; Lu, Kun ^[3]; Ma, Wei ^[4]; Wei, Zhixiang ^[3]

CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190 P. R. China; University of Chinese Academy of Sciences, Beijing 100049 P. R. China
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190 P. R. China; State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 P. R. China
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190 P. R. China
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 P. R. China

Ternary organic solar cells (OSCs), which blend two donors and fullerene derivatives with different absorption ranges, are a promising potential strategy for high-power conversion efficiencies (PCEs). In this study, inverted ternary OSCs are fabricated by blending a highly crystalline small molecule BDT-3T-CNCOO in a low band gap polymer PBDTTT-C-T:PC71BM. As the small molecule is introduced, the overall PCEs increase from 7.60% to 8.58%. The morphologies of ternary blends are studied by combining transmission electron microscopy and X-ray scattering techniques at different length scales. Hierarchical phase separation is revealed in the ternary blend, which is composed of domains with sizes of ≈88, ≈50, and ≈20 nm, respectively. The hierarchical phase separation balances the charge separation and transport in ternary OSCs. As a result, the fill factors of the devices significantly improve from 58.4% to 71.6%. Thus, ternary blends show higher hole mobility and higher fill factor than binary blends, which demonstrates a facile strategy to increase the performance of OSCs.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Ministry of Science and Technology of China; Beijing Municipal Science and Technology Commission; Chinese Academy of Sciences

Grant/Contract Number:: AC02-05CH11231; 21125420; 91427302; 2011CB932300; Z141100003814010

OSTI ID:: 1623466

Journal Information:: Advanced Science, Vol. 2, Issue 10; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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