Journal
ADVANCED MATERIALS
Volume 32, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002344
Keywords
charge transport; efficiency; fill factor; integer charge transfer; ternary solar cells
Categories
Funding
- National Science Foundation of China [21875067, 11604099, 51811530011, 11774092]
- Fundamental Research Funds for the Central Universities, Shanghai Ring-Star [19QA1403100]
- Shanghai Science and Technology Innovation Action Plan [19JC1416700]
- East China Normal University (ECNU) Multifunctional Platform for Innovation [006]
- National Key Research and Development Program of China [2017YFA0206600, 2017YFA0303403]
- Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University [SFO-Mat-LiU 2009-00971]
- STINT grant [CH2017-7163]
- Swedish Research Council [2016-05498]
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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.
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