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Green-Solvent Processed Blade-Coating Organic Solar Cells with an Efficiency Approaching 19% Enabled by Alkyl-Tailored Acceptors

Journal Article · · Nano-Micro Letters
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  1. Xi’an Jiaotong University (China)
  2. The Hong Kong Polytechnic University (China)
  3. Xi’an University of Science and Technology (China); Shaanxi Normal University, Xi’an (China)
  4. The Hong Kong Polytechnic University (China); The Hong Kong University of Science and Technology, Guangzhou (China)
  5. Beijing Institute of Technology (China)
  6. Shaanxi Normal University, Xi’an (China)
  7. Xi’an University of Science and Technology (China)
  8. The Hong Kong University of Science and Technology, Guangzhou (China)
  9. Jiangxi Normal University, Nanchang (China)
  10. Xi’an Modern Chemistry Research Institute (China)
  11. Changzhou University (China)
  12. Xi’an Jiaotong University (China); Changzhou University (China); Jiangxi Normal University, Nanchang (China)
+ Show Author Affiliations
Power-conversion-efficiencies (PCEs) of organic solar cells (OSCs) in laboratory, normally processed by spin-coating technology with toxic halogenated solvents, have reached over 19%. However, there is usually a marked PCE drop when the blade-coating and/or green-solvents toward large-scale printing are used instead, which hampers the practical development of OSCs. Here, a new series of N-alkyl-tailored small molecule acceptors named YR-SeNF with a same molecular main backbone are developed by combining selenium-fused central-core and naphthalene-fused end-group. Thanks to the N-alkyl engineering, NIR-absorbing YR-SeNF series show different crystallinity, packing patterns, and miscibility with polymeric donor. The studies exhibit that the molecular packing, crystallinity, and vertical distribution of active layer morphologies are well optimized by introducing newly designed guest acceptor associated with tailored N-alkyl chains, providing the improved charge transfer dynamics and stability for the PM6:L8-BO:YR-SeNF-based OSCs. As a result, a record-high PCE approaching 19% is achieved in the blade-coating OSCs fabricated from a green-solvent o-xylene with high-boiling point. Notably, ternary OSCs offer robust operating stability under maximum-power-point tracking and well-keep > 80% of the initial PCEs for even over 400 h. Our alkyl-tailored guest acceptor strategy provides a unique approach to develop green-solvent and blade-coating processed high-efficiency and operating stable OSCs, which paves a way for industrial development.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2471031
Journal Information:
Nano-Micro Letters, Journal Name: Nano-Micro Letters Journal Issue: 1 Vol. 15; ISSN 2311-6706
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (7)

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Related Subjects

14 SOLAR ENERGY
Alkyl-tailored guest acceptors
Blade-coating
Green solvent processing
Materials Science
Organic solar cells
Physics
Science & Technology - Other Topics
Stability