DataVXACS Applied Materials & InterfacesPaper
journal article·2016-12-07Open access

Soft X-ray Spectroscopy of a Complex Heterojunction in High-Efficiency Thin-Film Photovoltaics: Intermixing and Zn Speciation at the Zn(O,S)/Cu(In,Ga)Se2 Interface

Michelle Mezher, Rebekah Garris, Lorelle M. Mansfield, Monika Blum, Dirk Hauschild, Kimberly Horsley, Douglas A. Duncan, Wanli Yang, Marcus Bär, Lothar Weinhardt, Kannan Ramanathan, Clemens Heske

ACS Applied Materials & Interfaces· Volume 8· Issue 48
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Source abstract

Abstract

The chemical structure of the Zn(O,S)/Cu(In,Ga)Se 2 interface in high-efficiency photovoltaic devices is investigated using X-ray photoelectron and Auger electron spectroscopy, as well as soft X-ray emission spectroscopy. We find that the Ga/(Ga+In) ratio at the absorber surface does not change with the formation of the Zn(O,S)/Cu(In,Ga)Se 2 interface. Furthermore, we find evidence for Zn in multiple bonding environments, including ZnS, ZnO, Zn(OH) 2, and ZnSe. We also observe dehydrogenation of the Zn(O,S) buffer layer after Ar + ion treatment. Similar to high-efficiency CdS/Cu(In,Ga)Se 2 devices, intermixing occurs at the interface, with diffusion of Se into the buffer, and the formation of S—In and/or S—Ga bonds at or close to the interface.
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Research context

Electronic materials

OpenAlex topics: Chalcogenide Semiconductor Thin Films · Electron and X-Ray Spectroscopy Techniques · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry and Biochemistry, University of Nevada, Las Vegas (UNLV), Las Vegas, Nevada 89154-4003, United States

National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States

Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany

Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Renewable Energy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany

Institut für Physik und Chemie, Brandenburgische Technische Universität Cottbus-Senftenberg, 03046 Cottbus, Germany

Funding

Helmholtz-Gemeinschaft · U.S. Department of Energy

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