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Zwitterion Nondetergent Sulfobetaine-Modified SnO2 as an Efficient Electron Transport Layer for Inverted Organic Solar Cells

ACS omega, 2019-11, Vol.4 (21), p.19225-19237 [Peer Reviewed Journal]

Copyright © 2019 American Chemical Society 2019 American Chemical Society ;ISSN: 2470-1343 ;EISSN: 2470-1343 ;DOI: 10.1021/acsomega.9b02551 ;PMID: 31763546

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  • Title:
    Zwitterion Nondetergent Sulfobetaine-Modified SnO2 as an Efficient Electron Transport Layer for Inverted Organic Solar Cells
  • Author: Tran, Van-Huong ; Kim, Sung-Kon ; Lee, Soo-Hyoung
  • Is Part Of: ACS omega, 2019-11, Vol.4 (21), p.19225-19237
  • Description: Tin oxide (SnO2) has been widely accepted as an effective electron transport layer (ETL) for optoelectronic devices because of its outstanding electro-optical properties such as its suitable band energy levels, high electron mobility, and high transparency. Here, we report a simple but effective interfacial engineering strategy to achieve highly efficient and stable inverted organic solar cells (iOSCs) via a low-temperature solution process and an SnO2 ETL modified by zwitterion nondetergent sulfobetaine 3-(4-tert-butyl-1-pyridinio)-1-propanesulfonate (NDSB-256-4T). We found that NDSB-256-4T helps reduce the work function of SnO2, resulting in more efficient electron extraction and transport to the cathode of iOSCs. NDSB-256-4T also passivates the defects in SnO2, which serves as recombination centers that greatly reduce the device performance of iOSCs. In addition, NDSB-256-4T provides the better interfacial contact between SnO2 and the active layer. Thus, a higher power conversion efficiency (PCE) and longer device stability of iOSCs are expected for a combination of SnO2 and NDSB-256-4T than for devices based on SnO2 only. With these enhanced interfacial properties, P3HT:PC60BM-based iOSCs using SnO2/NDSB-256-4T (0.2 mg/mL) as an ETL showed both a higher average PCE of 3.72%, which is 33% higher than devices using SnO2 only (2.79%) and excellent device stability (over 90% of the initial PCE remained after storing 5 weeks in ambient air without encapsulation). In an extended application of the PTB7-Th:PC70BM systems, we achieved an impressive average PCE of 8.22% with SnO2/NDSB-256-4T (0.2 mg/mL) as the ETL, while devices based on SnO2 exhibited an average PCE of only 4.45%. Thus, the use of zwitterion to modify SnO2 ETL is a promising way to obtain both highly efficient and stable iOSCs.
  • Publisher: American Chemical Society
  • Language: English
  • Identifier: ISSN: 2470-1343
    EISSN: 2470-1343
    DOI: 10.1021/acsomega.9b02551
    PMID: 31763546
  • Source: American Chemical Society (ACS) Open Access
    PubMed Central
    DOAJ Directory of Open Access Journals
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