Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900913
Keywords
charge carrier recombination; energy losses; exciton dissociation
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Funding
- Scientific Research Foundation of Shenyang Agricultural University [880415039]
- Science and Technology Planning Project of Jilin Province [20190201306JC]
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Ternary polymer solar cells (PSCs) are fabricated that consisted of a blend of IEICO-4F and 3TT-FIC as electron acceptors and PBDB-T as an electron donor. The power conversion efficiency (PCE) of ternary PSCs is increased from 9.9% to 11.22% via the blend of IEICO-4F and 3TT-FIC as electron acceptors (the ratio of IEICO-4F:3TT-FIC is 6:4), which enhances the open-circuit voltage (V-OC) from 0.71 to 0.78 V. The main contribution of the blended acceptor is its broad energy level offset between the donor and acceptor (from 1.26 to 1.30 eV) due to the enhanced lowest unoccupied molecular orbital energy levels of the blended acceptor. Meanwhile, the small energy losses of the ternary photoactive layer (reduced from 0.55 to 0.52 eV) are simultaneously due to the more efficient exciton dissociation and the suppressed charge carrier recombination. This work provides an effective strategy for improving the photovoltaic performance of binary PSCs.
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