Tracing the Dynamic Chemical Transformations of Spiro-OMeTAD in Operating Perovskite Solar Cells.

Chittaranjan Das, Mayank Kedia, Kenedy Tabah Tanko, Yunshan Wang, Christian Njel, Monica Lira-Cantu, Michael Saliba

Abstract read

In one paragraph

Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

7 authors.

Chittaranjan DasInstitute for Photovoltaics (Ipv), Research Center SCoPE and Integrated Quantum Science and Technology Center (IQST), University of Stuttgart, Stuttgart, Germany.

Mayank KediaInstitute for Photovoltaics (Ipv), Research Center SCoPE and Integrated Quantum Science and Technology Center (IQST), University of Stuttgart, Stuttgart, Germany.

Kenedy Tabah TankoCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Autonomous University of Barcelona, Bellaterra, Spain.

Yunshan WangInstitute for Photovoltaics (Ipv), Research Center SCoPE and Integrated Quantum Science and Technology Center (IQST), University of Stuttgart, Stuttgart, Germany.

Christian NjelKarlsruhe Nano Micro Facility, KIT-Campus North, Eggenstein-Leopoldshafen, Germany.

Monica Lira-CantuCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Autonomous University of Barcelona, Bellaterra, Spain.

Michael SalibaInstitute for Photovoltaics (Ipv), Research Center SCoPE and Integrated Quantum Science and Technology Center (IQST), University of Stuttgart, Stuttgart, Germany.

Funding

European Research Council 101041809German Bundesministerium für Bildung und Forschung 01LS2103EGerman Research Foundation 431314977/GRK 2642German Research Foundation SPP 2196/CREATIVE

6 · The paper itself

Abstract

A significant stability challenge for perovskite solar cells (PSCs) lies in the widely used LiTFSI-doped Spiro-OMeTAD (Spiro) hole transport layer (HTL), in n-i-p configured cells. In this study, we used the sputtering depth profile X-ray photoelectron spectroscopy (SDP-XPS) to systematically examine the cause of instability in n-i-p structured PSCs under shelf-life stability (SLS), open-circuit potential (OCP), and maximum power point tracking (MPPT) conditions. We discover dissociation of the spiro caused by the breakdown of LiTFSI under operational stress, which alters the p-type nature of the spiro and the interface band bending. Specifically, LiTFSI dissociation leads to the formation of byproducts, LiF and Li

Identifiers

PMID41933905

DOI10.1002/advs.75107

PMCPMC13285165

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