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Molecular order control of non-fullerene acceptors for high-efficiency polymer solar cells

DOI: 10.1016/j.joule.2018.11.023 DOI Help

Authors: Wei Li (Wuhan University of Technology) , Mengxue Chen (Wuhan University of Technology) , Jinlong Cai (Wuhan University of Technology) , Emma L. K. Spooner (University of Sheffield) , Huijun Zhang (Wuhan University of Technology) , Robert S. Gurney (Wuhan University of Technology) , Dan Liu (Wuhan University of Technology) , Zuo Xiao (National Center for Nanoscience and Technology, Beijing) , David G. Lidzey (University of Sheffield) , Liming Ding (National Center for Nanoscience and Technology, Beijing) , Tao Wang (Wuhan University of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Joule

State: Published (Approved)
Published: December 2018
Diamond Proposal Number(s): 20419

Abstract: Adjusting molecular ordering, orientation, and nanoscale morphology within the photoactive layer of polymer:non-fullerene organic solar cells is crucial in achieving high power-conversion efficiency (PCE). Herein, we demonstrate that the molecular ordering and orientation of the n-type small-molecule acceptor COi8DFIC can be tuned from flat-on and edge-on lamellar crystalline to H- and J-type π-π stacking during the solution-casting process, resulting in broadened photon absorption and fine phase separation with the electron donor PTB7-Th. This favorable morphology with face-on π-π stacked electron donors and acceptors promotes efficient exciton dissociation at the donor/acceptor interface, together with enhanced and balanced carrier mobility. The enhanced short-circuit current density and fill factor lead to the achievement of a maximum PCE of 13.8% in binary, single-junction PTB7-Th:COi8DFIC non-fullerene polymer solar cells while also exhibiting superior stability.

Journal Keywords: polymer solar cells; organic photovoltaics; non-fullerene; molecular order; morphology; power-conversion efficiency

Subject Areas: Physics, Chemistry, Energy


Instruments: I07-Surface & interface diffraction

Other Facilities: Shanghai Synchrotron Radiation Facility