Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices

Lili Wang, Dhanashree Moghe, Soroush Hafezian, Pei Chen, Margaret Young, Mark Elinski, Ludvik Martinu, Stéphane Kéna-Cohen, Richard R. Lunt

    Research output: Research - peer-reviewArticle

    Abstract

    A new method was developed for doping and fabricating hysteresis-free hybrid perovskite-based photovoltaic devices by using alkali metal halide salts as interface layer additives. Such salt layers introduced at the perovskite interface can provide excessive halide ions to fill vacancies formed during the deposition and annealing process. A range of solution-processed halide salts were investigated. The highest performance of methylammonium lead mixed-halide perovskite device was achieved with a NaI interlayer and showed a power conversion efficiency of 12.6% and a hysteresis of less than 2%. This represents a 90% improvement compared to control devices without this salt layer. Through depth-resolved mass spectrometry, optical modeling, and photoluminescence spectroscopy, this enhancement is attributed to the reduction of iodide vacancies, passivation of grain boundaries, and improved hole extraction. Our approach ultimately provides an alternative and facile route to high-performance and hysteresis-free perovskite solar cells.

    LanguageEnglish (US)
    Pages23086-23094
    Number of pages9
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number35
    DOIs
    StatePublished - Sep 7 2016

    Profile

    Alkali Metals
    Metal halides
    Hysteresis
    Salts
    perovskite
    Alkali metals
    Perovskite
    Vacancies
    Photoluminescence spectroscopy
    Iodides
    Passivation
    Conversion efficiency
    Mass spectrometry
    Grain boundaries
    Doping (additives)
    Annealing
    Ions
    Lead
    methylamine
    Perovskite solar cells

    Keywords

    • alkali metal halide salt
    • doping
    • hole extraction
    • hysteresis
    • iodide vacancies
    • passivation
    • perovskite photovoltaics

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices. / Wang, Lili; Moghe, Dhanashree; Hafezian, Soroush; Chen, Pei; Young, Margaret; Elinski, Mark; Martinu, Ludvik; Kéna-Cohen, Stéphane; Lunt, Richard R.

    In: ACS Applied Materials and Interfaces, Vol. 8, No. 35, 07.09.2016, p. 23086-23094.

    Research output: Research - peer-reviewArticle

    Wang, L, Moghe, D, Hafezian, S, Chen, P, Young, M, Elinski, M, Martinu, L, Kéna-Cohen, S & Lunt, RR 2016, 'Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices' ACS Applied Materials and Interfaces, vol 8, no. 35, pp. 23086-23094. DOI: 10.1021/acsami.6b07368
    Wang, Lili ; Moghe, Dhanashree ; Hafezian, Soroush ; Chen, Pei ; Young, Margaret ; Elinski, Mark ; Martinu, Ludvik ; Kéna-Cohen, Stéphane ; Lunt, Richard R./ Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 35. pp. 23086-23094
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