journal article·2019-08-26

Stability of Chemically Doped Nanotube–Silicon Heterojunction Solar Cells: Role of Oxides at the Carbon–Silicon Interface

Daniel D. Tune, Hiroyuki Shirae, Vincent Lami, Robert J. Headrick, Matteo Pasquali, Yana Vaynzof, Suguru Noda, Erik K. Hobbie, Benjamin S. Flavel

ACS Applied Energy Materials· Volume 2· Issue 8
Publisher page

Abstract

Heterojunctions of carbon nanotubes interfaced with silicon and doped with AuCl3 can achieve attractive power conversion efficiencies when operated in the photovoltaic regime; however, the cost and long-term stability of such devices must be improved before they could become commercially viable. Here, we investigate the role of chemical treatment of the carbon nanotube/silicon interface with either SOCl2 or HNO3, prior to AuCl3 doping, on the stability of the photovoltaic devices. We find that while both treatments initially lead to similar device performance, devices treated with HNO3 are significantly more stable. Using X-ray photoemission spectroscopy, we demonstrate that pretreatment with the powerful organic oxidant SOCl2 generates a variety of low-oxidation-state silicon species at the nanotube–silicon interface that are not generated by exposure to HNO3. These species and their evolution over time are implicated in the reduced device stability, highlighting the importance of silicon oxidation states in determining the stability of carbon nanotube–silicon photovoltaic devices.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Nanowire Synthesis and Applications · Carbon Nanotubes in Composites · Silicon Nanostructures and Photoluminescence

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

Affiliations

Institute of Nanotechnology, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan

Kirchhoff Institute for Physics and the Centre of Advanced Materials, Universität Heidelberg, 69120 Heidelberg, Germany

Department of Chemical and Biomolecular Engineering, Department of Chemistry, Department of Materials Science & NanoEngineering, The Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005-1892, United States

Department of Physics, Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58102, United States

Funding

Welch Foundation · Ministry of Education, Culture, Sports, Science and Technology · Deutsche Forschungsgemeinschaft · Air Force Office of Scientific Research · National Aeronautics and Space Administration · Ministerium f?r Wissenschaft, Forschung und Kunst Baden-W?rttemberg

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