Fe dopant in ZnO: 2+ versus 3+ valency and ion-carrier s , p − d exchange interaction
J. Papierska,A. Ciechan,Piotr Boguslawski,Piotr Boguslawski,M. Boshta,Mohamed M. Gomaa,E. Chikoidze,Yves Dumont,Aneta Drabińska,Hanka Przybylinska,Anita Gardias,Jacek Szczytko,Andrzej Twardowski,Mateusz Tokarczyk,Grzegorz Kowalski,Bartlomiej S. Witkowski,Krzysztof Sawicki,Wojciech Pacuski,Michał Nawrocki,Jan Suffczyński +19 more
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TLDR
In this article, the authors analyzed the 3+ valency of transition metal ions in polycrystalline (Zn,Fe)O films with complementary theoretical and experimental studies.Abstract:
Dopants of transition metal ions in II-VI semiconductors exhibit native 2+ valency. Despite this, 3+ or mixed 3+/2+ valency of iron ions in ZnO was reported previously. Several contradictory mechanisms have been put forward for explanation of this fact so far. Here we analyze Fe valency in ZnO by complementary theoretical and experimental studies. Our calculations within the generalized gradient approximation (GGA+$U)$ indicate that the Fe ion is a relatively shallow donor. Its stable charge state is ${\mathrm{Fe}}^{2+}$ in ideal ZnO, however, the high energy of the (+/0) transition level enhances the compensation of ${\mathrm{Fe}}^{2+}$ to ${\mathrm{Fe}}^{3+}$ by nonintentional acceptors in real samples. Using several experimental methods like electron paramagnetic resonance, magnetometry, conductivity, excitonic magnetic circular dichroism, and magnetophotoluminescence we confirm the 3+ valency of the iron ions in polycrystalline (Zn,Fe)O films with the Fe content attaining 0.2%. We find a predicted increase of $n$-type conductivity upon the Fe doping with the Fe donor ionization energy of $0.25\ifmmode\pm\else\textpm\fi{}0.02$ eV consistent with the results of theoretical considerations. Moreover, our magneto-optical measurements confirm the calculated nonvanishing s,p-d exchange interaction between band carriers and localized magnetic moments of the ${\mathrm{Fe}}^{3+}$ ions in the ZnO, being so far an unsettled issue.read more
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Identification and modulation of electronic band structures of single-phase β-(AlxGa1−x)2O3 alloys grown by laser molecular beam epitaxy
Jing Li,Xuanhu Chen,Tongchuan Ma,Xiangyuan Cui,Fang-Fang Ren,Fang-Fang Ren,Shulin Gu,Rong Zhang,Youdou Zheng,Simon P. Ringer,Lan Fu,Hark Hoe Tan,Chennupati Jagadish,Jiandong Ye,Jiandong Ye +14 more
TL;DR: In this paper, the authors reported on the bandgap engineering of β-(AlxGa1−x)2O3 thin films and the identification of compositionally dependent electronic band structures by a combination of absorption spectra analyses and density functional theory calculations.
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Correction: Effect of ionic size compensation by Ag+ incorporation in homogeneous Fe-substituted ZnO: studies on structural, mechanical, optical, and magnetic properties
Gaurav Bajpai,Tulika Srivastava,N. Patra,Igamcha Moirangthem,S. N. Jha,Debnath Bhattacharyya,Sk Riyajuddin,Kaushik Ghosh,Dharma R. Basaula,Mahmud Khan,Shun-Wei Liu,Sajal Biring,Somaditya Sen,Somaditya Sen +13 more
TL;DR: In this article, the Ag ion has been incorporated in Fe-substituted ZnO to compensate the ionic size of Zn1−x[Fe0.8Ag0.2]xO (0 ≤ x ≤ 0.03125).
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Fine structure of an exciton coupled to a single Fe 2 + ion in a CdSe/ZnSe quantum dot
TL;DR: In this paper, a polarization-resolved photoluminescence study of the exchange interaction effects in a prototype system consisting of an individual ion and a single neutral exciton confined in a CdSe/ZnSe quantum dot is presented.
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Role of Li+ and Fe3+ in modified ZnO: Structural, vibrational, opto-electronic, mechanical and magnetic properties
Gaurav Bajpai,Igamcha Moirangthem,Shuvam Sarkar,Sudipta Roy Barman,C. P. Vinod,Shubhra Bajpai,Sk Riyajuddin,Kaushik Ghosh,Dharma R. Basaula,Mahmud Khan,Shun-Wei Liu,Sajal Biring,Somaditya Sen,Somaditya Sen +13 more
TL;DR: In this paper, a solid solution of Zn1-x(Fe0.5Li0.3d-O 2p hybridization) is synthesized with this viewpoint.
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Effect of yttrium substitution in Fe-doped ZnO nanoparticles: An EPR study
M. Cabrera-Baez,E. Padrón-Hernández,João Maria Soares,F.E.P. Santos,Y. Guerra,R. Peña-Garcia,R. Peña-Garcia +6 more
TL;DR: In this paper, the effect of Y3+ inclusion in ZnO nanoparticles doped with Fe3+ synthesized by the sol gel method was investigated, and the results showed an enhancement of the linewidth and the resonance field due to intrinsic defects in the hexagonal structure.
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