Elemental Nanoanalysis of Interfacial Alumina–Aryl Fluoride Interactions in Fullerene-Free Organic Tandem Solar Cells

Sebastian F. Hoefler, Georg Haberfehlner, Thomas Rath, Roberto Canteri, Mario Barozzi, Ferdinand Hofer, Gregor Trimmel

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

The choice of the optimum combination of materials for the absorber layers, electrodes, as well as interfacial layers is highly important to enhance further advances in the field of organic photovoltaics. Usually, these materials are assumed to be stable under the applied processing steps for the fabrication of the solar cells. Herein, organic tandem solar cells are examined with fluorine-containing absorber layers consisting of the fluorinated polymer donor PTB7-Th and the indacenodithiophene-type small molecule acceptor O-IDTBR and MoO3/Al/PFN-Br as recombination layer. Although both subcells comprise the same low bandgap absorber materials, the tandem solar cells reveal high open-circuit voltage values approaching 2 V. However, using a combination of scanning transmission electron microscopy nanoanalysis techniques and secondary ion mass spectrometry with depth profiling, an unexpected phenomenon is disclosed. It is found that significant amounts of fluorine are accumulated in the recombination layer region which originates very likely from alumina–aryl fluoride interactions responsible for a partial defluorination of the conjugated polymer in the absorber layer.
Originalspracheenglisch
Aufsatznummer1901053
Seitenumfang9
FachzeitschriftAdvanced Materials Interfaces
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 16 Aug 2019

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Fullerenes
Solar cells
Fluorine
Depth profiling
Conjugated polymers
Open circuit voltage
Secondary ion mass spectrometry
Energy gap
Transmission electron microscopy
Fabrication
Scanning electron microscopy
Electrodes
Molecules
Polymers
Processing

Schlagwörter

    Fields of Expertise

    • Advanced Materials Science

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    • NAWI Graz

    Dies zitieren

    Elemental Nanoanalysis of Interfacial Alumina–Aryl Fluoride Interactions in Fullerene-Free Organic Tandem Solar Cells. / Hoefler, Sebastian F.; Haberfehlner, Georg; Rath, Thomas; Canteri, Roberto; Barozzi, Mario; Hofer, Ferdinand; Trimmel, Gregor.

    in: Advanced Materials Interfaces , 16.08.2019.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    title = "Elemental Nanoanalysis of Interfacial Alumina–Aryl Fluoride Interactions in Fullerene-Free Organic Tandem Solar Cells",
    abstract = "The choice of the optimum combination of materials for the absorber layers, electrodes, as well as interfacial layers is highly important to enhance further advances in the field of organic photovoltaics. Usually, these materials are assumed to be stable under the applied processing steps for the fabrication of the solar cells. Herein, organic tandem solar cells are examined with fluorine-containing absorber layers consisting of the fluorinated polymer donor PTB7-Th and the indacenodithiophene-type small molecule acceptor O-IDTBR and MoO3/Al/PFN-Br as recombination layer. Although both subcells comprise the same low bandgap absorber materials, the tandem solar cells reveal high open-circuit voltage values approaching 2 V. However, using a combination of scanning transmission electron microscopy nanoanalysis techniques and secondary ion mass spectrometry with depth profiling, an unexpected phenomenon is disclosed. It is found that significant amounts of fluorine are accumulated in the recombination layer region which originates very likely from alumina–aryl fluoride interactions responsible for a partial defluorination of the conjugated polymer in the absorber layer.",
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    author = "Hoefler, {Sebastian F.} and Georg Haberfehlner and Thomas Rath and Roberto Canteri and Mario Barozzi and Ferdinand Hofer and Gregor Trimmel",
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    AU - Hoefler, Sebastian F.

    AU - Haberfehlner, Georg

    AU - Rath, Thomas

    AU - Canteri, Roberto

    AU - Barozzi, Mario

    AU - Hofer, Ferdinand

    AU - Trimmel, Gregor

    PY - 2019/8/16

    Y1 - 2019/8/16

    N2 - The choice of the optimum combination of materials for the absorber layers, electrodes, as well as interfacial layers is highly important to enhance further advances in the field of organic photovoltaics. Usually, these materials are assumed to be stable under the applied processing steps for the fabrication of the solar cells. Herein, organic tandem solar cells are examined with fluorine-containing absorber layers consisting of the fluorinated polymer donor PTB7-Th and the indacenodithiophene-type small molecule acceptor O-IDTBR and MoO3/Al/PFN-Br as recombination layer. Although both subcells comprise the same low bandgap absorber materials, the tandem solar cells reveal high open-circuit voltage values approaching 2 V. However, using a combination of scanning transmission electron microscopy nanoanalysis techniques and secondary ion mass spectrometry with depth profiling, an unexpected phenomenon is disclosed. It is found that significant amounts of fluorine are accumulated in the recombination layer region which originates very likely from alumina–aryl fluoride interactions responsible for a partial defluorination of the conjugated polymer in the absorber layer.

    AB - The choice of the optimum combination of materials for the absorber layers, electrodes, as well as interfacial layers is highly important to enhance further advances in the field of organic photovoltaics. Usually, these materials are assumed to be stable under the applied processing steps for the fabrication of the solar cells. Herein, organic tandem solar cells are examined with fluorine-containing absorber layers consisting of the fluorinated polymer donor PTB7-Th and the indacenodithiophene-type small molecule acceptor O-IDTBR and MoO3/Al/PFN-Br as recombination layer. Although both subcells comprise the same low bandgap absorber materials, the tandem solar cells reveal high open-circuit voltage values approaching 2 V. However, using a combination of scanning transmission electron microscopy nanoanalysis techniques and secondary ion mass spectrometry with depth profiling, an unexpected phenomenon is disclosed. It is found that significant amounts of fluorine are accumulated in the recombination layer region which originates very likely from alumina–aryl fluoride interactions responsible for a partial defluorination of the conjugated polymer in the absorber layer.

    KW - organic electronics, oxygen–metal–fluorine interaction, photovoltaics, scanning transmission electron microscopy, secondary ion mass spectrometry

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