Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202200478
Keywords
all-polymer solar cells; sequential solution deposition; vertical-phase distribution
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Funding
- Major Program of Natural Science Foundation of Shandong Province [ZR2019ZD43]
- National Natural Science Foundation of China [52073162]
- Shandong Provincial Natural Science Foundation [ZR2021QF016]
- Qilu Young Scholar Program of Shandong University
- ARC Centre of Excellence in Exciton Science [CE170100026]
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This study adopts a ternary-assisted sequential solution deposition strategy to regulate the vertical compositional profile of all-polymer solar cells (all-PSCs). A favorable acceptor(donor)-enriched phase near the cathode(anode) can be obtained by this strategy, resulting in enhanced exciton yield and carrier density. Non-geminate recombination is suppressed by improving the exciton diffusion length. This study demonstrates the success of the ternary-assisted strategy in reorganizing the vertical-phase distribution, providing a feasible route for efficient all-polymer photovoltaics.
All-polymer solar cells (all-PSCs) have received attention in recent years for their desirable properties in power conversion efficiency and long-term operational stability. However, it is still a big challenge to acquire an ideal vertical-phase distribution of polymer/polymer blends due to the non-ideal molecular conformations and mixing behaviors. Herein, a ternary-assisted sequential solution deposition (SSD) strategy is adopted to regulate the vertical compositional profile of all-PSCs. A favorable acceptor(donor)-enriched phase near the cathode(anode) can be obtained by a ternary-assisted SSD strategy. With such a compositional profile, the exciton yield and carrier density can be enhanced by the vertical component gradient. Remarkably, the non-geminate recombination is suppressed with an improved exciton diffusion length (15.36 nm) that delivers an outstanding power conversion efficiency over 16% of the ternary PM6/PY-IT:PDI-2T SSD devices. This work demonstrates the success of ternary-assisted SSD strategy in reorganizing the vertical-phase distribution, which provides a feasible route for a potential ternary device construction toward efficient all-polymer photovoltaics.
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