• Login
    View Item 
    •   MMUST Institutional Repository
    • University Journals/ Articles
    • Gold Collection
    • View Item
    •   MMUST Institutional Repository
    • University Journals/ Articles
    • Gold Collection
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)

    Thumbnail
    View/Open
    Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)..pdf (1.792Mb)
    Date
    2017-05-26
    Author
    Awino, Celline
    Odari, Victor
    Dittrich, Thomas
    Prajongtat, Pongthep
    Sakwa, Thomas
    Rech, Bernd
    Metadata
    Show full item record
    Abstract
    Studies have shown that perovskites have a high potential of outdoing silicon based solar cells in terms of solar energy conversion, but their rate of degradation is also high. This study reports on improvement on the stability of CH3NH3PbI3 by passivating it with polymethylmethacrylate (PMMA). Structural and electronic properties of CH3NH3PbI3 stabilized by polymethylmethacrylate (PMMA) were investigated by varying concentrations of PMMA in the polymer solutions. Stability tests were performed over a period of time using modulated surface photovoltage (SPV) spectroscopy, X-ray diffraction (XRD), and photoluminescence (PL) measurements. The XRD patterns confirm the tetragonal structure of the deposited CH3NH3PbI3 for every concentration of PMMA. Furthermore, CH3NH3PbI3 coated with 40 mg/mL of PMMA did not show any impurity phase even after storage in air for 43 days. The Tauc gap (ETauc) determined on the basis of the in-phase SPV spectra was found in the range from 1.585 to 1.62 eV for the samples stored during initial days, but shifted towards lower energies as the storage time increased. This can be proposed to be due to different chemical reactions between CH3NH3PbI3/PMMA interfaces and air. PL intensity increased with increasing concentration of PMMA except for the perovskite coated with 40 mg/mL of PMMA. PL quenching in the perovskite coated with 40 mg/mL of PMMA can be interpreted as fast electron transfer towards the substrate in the sample. This study shows that, with an optimum concentration of PMMA coating on CH3NH3PbI3, the lifetime and hence stability on electrical and structural behavior of CH3NH3PbI3 is improved
    URI
    https://doi.org/10.3390/coatings7080115
    https://www.mdpi.com/2079-6412/8/12/452
    http://r-library.mmust.ac.ke/123456789/1756
    Collections
    • Gold Collection [989]

    MMUST Library copyright © 2011-2022  MMUST Open Access Policy
    Contact Us | Send Feedback
     

     

    Browse

    All of Institutional RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    MMUST Library copyright © 2011-2022  MMUST Open Access Policy
    Contact Us | Send Feedback