Record Details

Title:
Revealing hole trapping in zinc oxide nanoparticles by time-resolved X-ray spectroscopy
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument FXE
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Topic:
Scientific area:
Abstract:
Nanostructures of transition metal oxides, such as zinc oxide, have attracted considerable interest for solar-energy conversion and photocatalysis. Both applications are sensitive to the transport and trapping of photoexcited charge carriers. The probing of electron trapping has recently become possible using time-resolved element-sensitive methods, such as X-ray spectroscopy. However, valence-band-trapped holes have so far escaped observation. Herein we use X-ray absorption spectroscopy combined with a dispersive X-ray emission spectrometer to probe the charge carrier relaxation and trapping processes in zinc oxide nanoparticles after above band-gap photoexcitation. Our results, supported by simulations, demonstrate that within 80 ps, photoexcited holes are trapped at singly charged oxygen vacancies, which causes an outward displacement by ~15% of the four surrounding zinc atoms away from the doubly charged vacancy. This identification of the hole traps provides insight for future developments of transition metal oxide-based nanodevices.
Imprint:
Nature, 2018
Journal Information:
Nature Communications, 9 (1), 478 (2018)
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Language(s):
English


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 Record created 2019-03-01, last modified 2019-03-01

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