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Modified SnO 2 with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells

ACS omega, 2018-12, Vol.3 (12), p.18398-18410 [Peer Reviewed Journal]

ISSN: 2470-1343 ;EISSN: 2470-1343 ;DOI: 10.1021/acsomega.8b02773 ;PMID: 31458412

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  • Title:
    Modified SnO 2 with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells
  • Author: Tran, Van-Huong ; Park, Hanok ; Eom, Seung Hun ; Yoon, Sung Cheol ; Lee, Soo-Hyoung
  • Is Part Of: ACS omega, 2018-12, Vol.3 (12), p.18398-18410
  • Description: We report for the first time that alkali carbonates (Li CO , K CO , and Rb CO ) based on a low-temperature solution process can be used as interfacial modifiers for SnO as robust electron-transport layers (ETL) for inverted organic solar cells (iOSCs). The room-temperature photoluminescence, the electron-only devices, and the impedance studies altogether suggested the interfacial properties of the alkali carbonates-modified SnO ETLs, which were much better than those based on the SnO only, provided efficient charge transport, and reduced the charge recombination rates for iOSCs. The iOSCs using the polymer donor poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2- ;4,5- ']dithiophene-2,6-diyl- -(4-(2-ethylhexyl)-3-fluorothieno[3,4- ]thiophene-)-2-carboxylate-2-6-diyl] and the fullerene acceptor phenyl-C -butyric acid methyl ester as the active layer showed the average power-conversion efficiencies (PCEs) based on ten devices of 6.70, 6.85, and 7.35% with Li CO -, K CO -, and Rb CO -modified SnO as ETLs, respectively; these are more than 22, 24, and 33% higher than those based on the SnO only (5.49%). Moreover, these iOSC devices exhibited long-term stabilities, with over 90% PCEs remaining after the devices were stored in ambient air for 6 weeks without encapsulations. We believe that alkali carbonates-modified SnO approaches are an effective way to achieve stable and highly efficient iOSCs and might also be suitable for other optoelectronic devices where an ETL is needed, such as perovskite solar cells or organic light-emitting diodes.
  • Publisher: United States
  • Language: English
  • Identifier: ISSN: 2470-1343
    EISSN: 2470-1343
    DOI: 10.1021/acsomega.8b02773
    PMID: 31458412
  • Source: American Chemical Society (ACS) Open Access
    PubMed Central
    DOAJ Directory of Open Access Journals
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