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13.9% efficiency ternary nonfullerene solar cells featuring low-structural order

DOI: 10.1021/acsenergylett.9b01630 DOI Help

Authors: Baocai Du (Wuhan University of Technology) , Renyong Geng (Wuhan University of Technology) , Wei Li (Wuhan University of Technology) , Donghui Li (Wuhan University of Technology) , Yuchao Mao (Wuhan University of Technology) , Mengxue Chen (Wuhan University of Technology) , Xue Zhang (Wuhan University of Technology) , Joel A. Smith (University of Sheffield) , Rachel C. Kilbride (University of Sheffield) , Mary E. O'kane (University of Sheffield) , Dan Liu (Wuhan University of Technology) , David G. Lidzey (University of Sheffield) , Weihua Tang (Nanjing University of Science and Technology) , Tao Wang (Wuhan University of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Energy Letters

State: Published (Approved)
Published: September 2019
Diamond Proposal Number(s): 22651

Abstract: The insufficient phase separation between polymer donors and non-fullerene acceptors (NFAs) featuring with low-structural orders disrupts efficient charge transport and increases charge recombination, consequently limits the maximum achievable power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, an NFA IT-M has been added as the third component into the PBDB-T:m-INPOIC OSCs, and is shown to effectively tune the phase separation between donor and acceptor molecules, although all components in the ternary system exhibit low degrees of structural orders. The incorporation of 10 wt% IT-M into a PBDB-T:m-INPOIC binary host blend appreciably increases the length scale of phase separation, creating continuous pathways which increase and balance charge transport. This leads to an enhanced photovoltaic performance from 12.8% in the binary cell to 13.9% for the ternary cell with simultaneously improved open-circuit voltage, short-circuit current and fill factor. This work highlights the beneficial role of ternary components in controlling the morphology of the active layer for high performance OSCs.

Subject Areas: Materials, Energy


Instruments: I07-Surface & interface diffraction