期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 14, 页码 16185-16196出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c25223
关键词
organic solar cells; nonfullerene solar cells; gold nanorods; surface plasmon resonance; interfacial modifiers
资金
- Natural Sciences and Engineering Research Council of Canada
- le Fonds de recherche du Quebec-Nature et technologies
- Canada Research Chairs Program
- National Natural Science Foundation of China [51802169]
- China Postdoctoral Science Foundation [2018M632614]
- International Postdoctoral Exchange Fellowship Program [20190032]
- Natural Science Foundation of Shandong Province [ZR2018BEM007]
By incorporating polyelectrolyte polystyrenesulfonate (PSS)-coated plasmonic gold nanorods (GNRs@PSS) as rear interfacial modifiers, the sunlight absorption and charge generation efficiency of nonfullerene organic solar cells (OSCs) can be improved.
Sufficient sunlight absorption and exciton generation are critical for developing efficient nonfullerene organic solar cells (OSCs). In this work, polyelectrolyte polystyrenesulfonate (PSS)-coated plasmonic gold nanorods (GNRs@PSS) were incorporated, for the first time, into the inverted nonfullerene OSCs as rear interfacial modifiers to improve sunlight absorption and charge generation via the near-field plasmonic and back-scattering effects. The plasmonic GNRs effectively improved the sunlight absorption and enhanced the charge generation. Meanwhile, the negatively charged PSS shell ensured the uniform dispersion of the GNRs on the surface of the photoactive layer, optimized the interfacial contact, and further promoted the hole transport to the electrode. These concerted synergistic effects augmented the efficiency (10.11%) by nearly 20% relative to the control device (8.47%). Remarkably, the ultrathin (similar to 2.2 nm) organic layer on the surface of GNRs was closely examined by acquiring the carbon contrast image through energy-filtered transmission electron microscopy (EF-TEM), which clearly confirmed the coating uniformity from the side to end-cap of GNRs. The surface plasmon resonance (SPR) effect of the GNRs@PSS on the surface of the photoactive layer was unprecedentedly mapped by photoinduced force microscopy (PiFM) under the illumination of a tunable wavelength supercontinuum laser mimicking sunlight. Furthermore, investigations into the effect of size, surface coverage, and incorporation location of GNRs@PSS on the performance of OSCs revealed that the appropriate design and incorporation of the plasmonic nanostructures are crucial, otherwise the performance can be decreased, as evidenced in the case of front interface integration.
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