Chemical Interaction at the MoO3/CH3NH3PbI3-xClx Interface

Liao X, Habisreutinger SN, Wiesner S, Sadoughi G, Abou-Ras D, Gluba MA, Wilks RG, Félix R, Rusu M, Nicholas RJ, Snaith HJ, Bär M (2021)

Publication Type: Journal article

Publication year: 2021

Journal

ACS Applied Materials and Interfaces American Chemical Society

Book Volume: 13

Pages Range: 17085-17092

Journal Issue: 14

DOI: 10.1021/acsami.1c01284

Abstract

The limited long-term stability of metal halide perovskite-based solar cells is a bottleneck in their drive toward widespread commercial adaptation. The organic hole-transport materials (HTMs) have been implicated in the degradation, and metal oxide layers are proposed as alternatives. One of the most prominent metal oxide HTM in organic photovoltaics is MoO3. However, the use of MoO3 as HTM in metal halide perovskite-based devices causes a severe solar cell deterioration. Thus, the formation of the MoO3/CH3NH3PbI3-xClx (MAPbI3-xClx) heterojunction is systematically studied by synchrotron-based hard X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Raman spectroscopy. Upon MoO3 deposition, significant chemical interaction is induced at the MoO3/MAPbI3-xClx interface: substoichiometric molybdenum oxide is present, and the perovskite decomposes in the proximity of the interface, leading to accumulation of PbI2 on the MoO3 cover layer. Furthermore, we find evidence for the formation of new compounds such as PbMoO4, PbN2O2, and PbO as a result of the MAPbI3-xClx decomposition and suggest chemical reaction pathways to describe the underlying mechanism. These findings suggest that the (direct) MoO3/MAPbI3-xClx interface may be inherently unstable. It provides an explanation for the low power conversion efficiencies of metal halide perovskite solar cells that use MoO3 as a hole-transport material and in which there is a direct contact between MoO3 and perovskite.

Authors with CRIS profile

Marcus Bär Professur für Röntgenspektroskopie (HIERN)

Involved external institutions

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) DE Germany (DE) University of Oxford GB United Kingdom (GB) Nanchang University (NCU) / 南昌大学 CN China (CN)

How to cite

APA:

Liao, X., Habisreutinger, S.N., Wiesner, S., Sadoughi, G., Abou-Ras, D., Gluba, M.A.,... Bär, M. (2021). Chemical Interaction at the MoO3/CH3NH3PbI3-xClx Interface. ACS Applied Materials and Interfaces, 13(14), 17085-17092. https://doi.org/10.1021/acsami.1c01284

MLA:

Liao, Xiaxia, et al. "Chemical Interaction at the MoO3/CH3NH3PbI3-xClx Interface." ACS Applied Materials and Interfaces 13.14 (2021): 17085-17092.

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