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

Research output: Contribution to journalArticle

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.
Original languageEnglish
Pages (from-to)9602-9611
Number of pages10
JournalJournal of Materials Science / Materials in Electronics
Volume30
Issue number10
Early online date16 Apr 2019
DOIs
Publication statusPublished - 2019

Keywords

  • Solar cells
  • perovskite
  • self assembled monolayers
  • phosphonic acid
  • nickel oxide
  • Interface

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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