Steady-state optoelectronic measurements of halide perovskites on a selective contact: a path to in-depth comprehension of their photovoltaic activity

Anat Itzhak, David Keller, Tatyana Bendikov, Adi Kama, Oded Millo, Isaac Balberg, David Cahen

Research output: Contribution to journalArticlepeer-review

Abstract

Most of the charge transport properties in halide perovskite (HaP) absorbers are measured by transient measurements with pulsed excitations; however, most solar cells in real life function in steady-state conditions. In contrast to working devices that include selective contacts, steady-state measurements need as high as possible photoconductivity (σph), which is typically restricted to the absorber alone. In this paper, we enabled steady-state charge transport measurement using atomic layer deposition (ALD) to grow a conformal, ultra-thin (∼4 nm) ZnO electron transport layer that is laterally insulating due to its thickness. Due to the highly alkaline behavior of the ZnO surfaces, it readily reacts with halide Perovskites. ALD process was used to form an Aluminum oxynitride (AlON) thin (∼2 nm) layer that passivates the ZnO-HaP interface. We show that the presence of the AlON layer prevents HaP degradation caused by the interaction with the ZnO layer, improves the HaP σph, and doubles the HaP carrier diffusion lengths.

Original languageEnglish
Article number455107
JournalJournal Physics D: Applied Physics
Volume55
Issue number45
DOIs
StatePublished - 10 Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 IOP Publishing Ltd.

Keywords

  • charge transport
  • halide perovskite
  • optoelectronics
  • steady state photograting

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