Charge Carrier Screening in Photoexcited Epitaxial Semiconductor Nanorods Revealed by Transient X-ray Absorption Linear Dichroism
| العنوان: | Charge Carrier Screening in Photoexcited Epitaxial Semiconductor Nanorods Revealed by Transient X-ray Absorption Linear Dichroism |
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| المؤلفون: | John C. Burke, Rachel Wallick, Thomas Rossi, Anne Marie March, Cecilia M. Gentle, Tyler N. Haddock, Gilles Doumy, Conner P. Dykstra, Renske M. van der Veen |
| المصدر: | Nano letters. 21(22) |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Band gap, business.industry, Mechanical Engineering, Bioengineering, General Chemistry, Electronic structure, Condensed Matter Physics, Linear dichroism, Photoexcitation, Condensed Matter::Materials Science, Semiconductor, Excited state, Optoelectronics, General Materials Science, Charge carrier, business, Absorption (electromagnetic radiation) |
| الوصف: | Understanding the electronic structure and dynamics of semiconducting nanomaterials at the atomic level is crucial for the realization and optimization of devices in solar energy, catalysis, and optoelectronic applications. We report here on the use of ultrafast X-ray linear dichroism spectroscopy to monitor the carrier dynamics in epitaxial ZnO nanorods after band gap photoexcitation. By rigorously subtracting out thermal contributions and conducting ab initio calculations, we reveal an overall depletion of absorption cross sections in the transient X-ray spectra caused by photogenerated charge carriers screening the core-hole potential of the X-ray absorbing atom. At low laser excitation densities, we observe phase-space filling by excited electrons and holes separately. These results pave the way for carrier- and element-specific probing of charge transfer dynamics across heterostructured interfaces with ultrafast table-top and fourth-generation X-ray sources. |
| تدمد: | 1530-6992 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84413822ab315a0a33672360a3c19da4 https://pubmed.ncbi.nlm.nih.gov/34767364 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....84413822ab315a0a33672360a3c19da4 |
| قاعدة البيانات: | OpenAIRE |
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