Enhanced and Balanced Charge Transport Boosting Ternary Solar Cells Over 17% Efficiency

Danqin Li; Lei Zhu; Xianjie Liu; Wei Xiao; Jianming Yang; Ruru Ma; Liming Ding; Feng Liu; Chungang Duan; Mats Fahlman; Qinye Bao

doi:10.1002/adma.202002344

Enhanced and Balanced Charge Transport Boosting Ternary Solar Cells Over 17% Efficiency

Adv Mater. 2020 Aug;32(34):e2002344. doi: 10.1002/adma.202002344. Epub 2020 Jul 19.

Authors

Danqin Li¹, Lei Zhu², Xianjie Liu³, Wei Xiao¹, Jianming Yang¹, Ruru Ma¹, Liming Ding⁴, Feng Liu², Chungang Duan^{1

5}, Mats Fahlman³, Qinye Bao^{1

5}

Affiliations

¹ Key Laboratory of Polar Materials and Devices, Department of Electronic Science, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China.
² School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200025, P. R. China.
³ Laboratory of Organic Electronics, ITN, Linköping University, Norrköping, SE-60174, Sweden.
⁴ Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.
⁵ Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China.

PMID: 32686255
DOI: 10.1002/adma.202002344

Abstract

Ternary architecture is one of the most effective strategies to boost the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, an OSC with a ternary architecture featuring a highly crystalline molecular donor DRTB-T-C4 as a third component to the host binary system consisting of a polymer donor PM6 and a nonfullerene acceptor Y6 is reported. The third component is used to achieve enhanced and balanced charge transport, contributing to an improved fill factor (FF) of 0.813 and yielding an impressive PCE of 17.13%. The heterojunctions are designed using so-called pinning energies to promote exciton separation and reduce recombination loss. In addition, the preferential location of DRTB-T-C4 at the interface between PM6 and Y6 plays an important role in optimizing the morphology of the active layer.

Keywords: charge transport; efficiency; fill factor; integer charge transfer; ternary solar cells.

Abstract

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