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7 March 2022 ZnO: ultrafast generation and decay of a surface metal
Lukas Gierster, Sesha Vempati, Julia Stähler
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Proceedings Volume PC11999, Ultrafast Phenomena and Nanophotonics XXVI; PC119990A (2022) https://doi.org/10.1117/12.2607585
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Band bending at semiconductor surfaces induced by e.g. chemical doping can create metallic surfaces with properties not found in the bulk, such as high electron mobility, magnetism or superconductivity. Optical generation of such metallic surfaces on ultrafast timescales would be appealing for high-speed electronics. We demonstrate the ultrafast generation of a metal at the surface of ZnO upon photoexcitation. Compared to known ultrafast photoinduced semiconductor-to-metal transitions that occur in the bulk of inorganic semiconductors, the metallization of the ZnO surface is launched by 3–4 orders of magnitude lower photon fluxes. Using time- and angle-resolved photoelectron spectroscopy, we show that the phase transition is caused by photoinduced downward surface band bending due to photodepletion of donor-type deep surface defects. These findings present a general route for controlling surface-confined metallicity on ultrafast timescales.
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Lukas Gierster, Sesha Vempati, and Julia Stähler "ZnO: ultrafast generation and decay of a surface metal", Proc. SPIE PC11999, Ultrafast Phenomena and Nanophotonics XXVI, PC119990A (7 March 2022); https://doi.org/10.1117/12.2607585
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KEYWORDS
Semiconductors
Ultrafast phenomena
Zinc oxide
Metals
Magnetic semiconductors
Doping
Interfaces
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