Modification of NiOx hole transport layers with 4-bromobenzylphosphonic acid and its influence on the performance of lead halide perovskite solar cells

Jimmy Mangalam, Thomas Rath, Stefan Weber, Birgit Kunert, Theodorous Dimoploulos, Alexander Fian, Gregor Trimmel

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Lead halide perovskites have proved to be exceptionally efficient absorber materials for photovoltaics. Besides improving the properties of the perovskite absorbers, device engineering and the optimization of interfaces will be equally important to further the advancement of this emerging solar cell technology. Herein, we report a successful modification of the interface between the NiOx hole transport layer and the perovskite absorber layer using 4-bromobenzylphosphonic acid based self-assembled monolayers leading to an improved photovoltaic performance. The modification of the NiOx layer is carried out by dip coating which allows sufficient time for the self-assembly. The change in the surface free energy and the non-polar nature of the resulting surface is corroborated by contact angle measurements. X-ray photoelectron spectroscopy confirms the presence of phosphor and bromine on the NiOx surface. Furthermore, the resultant solar cells reveal increased photovoltage. For typical devices without and with modification, the photovoltage improves from 0.978 V to 1.029 V. The champion VOC observed was 1.099 V. The increment in photovoltage leads to improved power conversion efficiencies for the modified cells. The maximum power point tracking measurements of the devices show stable power output of the solar cells.
Originalspracheenglisch
Seiten (von - bis)9602-9611
Seitenumfang10
FachzeitschriftJournal of Materials Science / Materials in Electronics
Jahrgang30
Ausgabenummer10
Frühes Online-Datum16 Apr 2019
DOIs
PublikationsstatusVeröffentlicht - 2019

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photovoltages
halides
Solar cells
Lead
solar cells
Perovskite
acids
Acids
absorbers
absorbers (materials)
Bromine
volatile organic compounds
Self assembled monolayers
perovskites
bromine
Angle measurement
Volatile organic compounds
Phosphors
Self assembly
Free energy

Schlagwörter

    ASJC Scopus subject areas

    • !!Electronic, Optical and Magnetic Materials
    • !!Condensed Matter Physics
    • !!Atomic and Molecular Physics, and Optics
    • !!Electrical and Electronic Engineering

    Fields of Expertise

    • Advanced Materials Science

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    Modification of NiOx hole transport layers with 4-bromobenzylphosphonic acid and its influence on the performance of lead halide perovskite solar cells. / Mangalam, Jimmy; Rath, Thomas; Weber, Stefan; Kunert, Birgit; Dimoploulos, Theodorous ; Fian, Alexander; Trimmel, Gregor.

    in: Journal of Materials Science / Materials in Electronics, Jahrgang 30, Nr. 10, 2019, S. 9602-9611.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    AU - Fian, Alexander

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