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Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides

Nature chemistry, 2015-09, Vol.7 (9), p.703-711 [Peer Reviewed Journal]

ISSN: 1755-4330 ;EISSN: 1755-4349 ;DOI: 10.1038/nchem.2324 ;PMID: 26291941

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  • Title:
    Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides
  • Author: Li, Xiong ; Dar, M Ibrahim ; Yi, Chenyi ; Luo, Jingshan ; Tschumi, Manuel ; Zakeeruddin, Shaik M ; Nazeeruddin, Mohammad Khaja ; Han, Hongwei ; Grätzel, Michael
  • Is Part Of: Nature chemistry, 2015-09, Vol.7 (9), p.703-711
  • Description: In the past few years, organic-inorganic halide perovskites have rapidly emerged as promising materials for photovoltaic applications, but simultaneously achieving high performance and long-term stability has proved challenging. Here, we show a one-step solution-processing strategy using phosphonic acid ammonium additives that results in efficient perovskite solar cells with enhanced stability. We modify the surface of methylammonium lead triiodide (CH3NH3PbI3) perovskite by spin-coating its precursor solution in the presence of butylphosphonic acid 4-ammonium chloride. Morphological, structural and elemental analyses show that the phosphonic acid ammonium additive acts as a crosslink between neighbouring grains in the perovskite structure, through strong hydrogen bonding of the -PO(OH)2 and -NH3(+) terminal groups to the perovskite surface. The additives facilitate the incorporation of the perovskite within a mesoporous TiO2 scaffold, as well as the growth of a uniform perovskite layer at the surface, enhancing the material's photovoltaic performance from 8.8 to 16.7% as well as its resistance to moisture.
  • Publisher: England
  • Language: English
  • Identifier: ISSN: 1755-4330
    EISSN: 1755-4349
    DOI: 10.1038/nchem.2324
    PMID: 26291941
  • Source: ProQuest Central
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