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Principi E. Preface to Special Topic: The Advent of Ultrafast X-Ray Absorption Spectroscopy. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2024; 11:030401. [PMID: 38912290 PMCID: PMC11193549 DOI: 10.1063/4.0000259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Accepted: 06/11/2024] [Indexed: 06/25/2024]
Affiliation(s)
- Emiliano Principi
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 – km 163.5, 34149 Basovizza (TS), Italy
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Kahraman A, Socie E, Nazari M, Kazazis D, Buldu-Akturk M, Kabanova V, Biasin E, Smolentsev G, Grolimund D, Erdem E, Moser JE, Cannizzo A, Bacellar C, Milne C. Tailoring p-Type Behavior in ZnO Quantum Dots through Enhanced Sol-Gel Synthesis: Mechanistic Insights into Zinc Vacancies. J Phys Chem Lett 2024; 15:1755-1764. [PMID: 38324709 PMCID: PMC10875662 DOI: 10.1021/acs.jpclett.3c03519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/09/2024]
Abstract
The synthesis and control of properties of p-type ZnO is crucial for a variety of optoelectronic and spintronic applications; however, it remains challenging due to the control of intrinsic midgap (defect) states. In this study, we demonstrate a synthetic route to yield colloidal ZnO quantum dots (QD) via an enhanced sol-gel process that effectively eliminates the residual intermediate reaction molecules, which would otherwise weaken the excitonic emission. This process supports the creation of ZnO with p-type properties or compensation of inherited n-type defects, primarily due to zinc vacancies under oxygen-rich conditions. The in-depth analysis of carrier recombination in the midgap across several time scales reveals microsecond carrier lifetimes at room temperature which are expected to occur via zinc vacancy defects, supporting the promoted p-type character of the synthesized ZnO QDs.
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Affiliation(s)
| | - Etienne Socie
- École
polytechnique fédérale de Lausanne (EPFL), Rte Cantonale, 1015 Lausanne, Switzerland
| | - Maryam Nazari
- Institute
of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | | | - Merve Buldu-Akturk
- Faculty
of Engineering and Natural Sciences, Sabanci
University, Tuzla 34956 Istanbul, Turkey
| | | | - Elisa Biasin
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | | | | | - Emre Erdem
- Faculty
of Engineering and Natural Sciences, Sabanci
University, Tuzla 34956 Istanbul, Turkey
| | - Jacques E. Moser
- École
polytechnique fédérale de Lausanne (EPFL), Rte Cantonale, 1015 Lausanne, Switzerland
| | - Andrea Cannizzo
- Institute
of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
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