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Wang H, Liu W, He X, Zhang P, Zhang X, Xie Y. An Excitonic Perspective on Low-Dimensional Semiconductors for Photocatalysis. J Am Chem Soc 2020; 142:14007-14022. [DOI: 10.1021/jacs.0c06966] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hui Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, P. R. China
| | - Wenxiu Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xin He
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Peng Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xiaodong Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, P. R. China
| | - Yi Xie
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, P. R. China
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Munusamy G, Mani R, Varadharajan K, Narasimhan S. Experimental Study of Effective Mass and Spin-Orbital Energy of the Al 2O 3/NiO Nanoheterostructure Material. J Phys Chem A 2019; 123:9857-9864. [PMID: 31642681 DOI: 10.1021/acs.jpca.9b07366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effective mass of the materials relies on exciton dynamics which is greatly dominated by energy gap of the materials. We examined the effective mass for the Al2O3/NiO nanoheterostructure material through polarization in the dielectric study. The mean optical effective mass was calculated to be mopt* = 5.69645 × 10-20 mop/m0 in the UV-visible region (1 × 106 to 5.4 × 106 Hz). From the group and phase velocity values, we observed that Al2O3/NiO is an anisotropic material. The electron spin-orbit energy splitting associated to electron in the valence band was identified using the Gaussian-confining 3D potential under normalized angular momentum (n, l = 0, 1, 2, 3). The 1S (1S1/2) and 2S (2S1/2) orbital ionization energies were calculated to be -6.08 and -5.99 eV for AlO3/NiO. The orbital ionization energies were established from the Bohr radius aB = 5.29 × 10-11 m and donor Rydberg constant Ry = 1.097 × 107 m-1 of the identical hydrogen atom. Our study gives insights into the exciton dynamics and calculation of orbital energy for the nanoheterostructure materials.
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Affiliation(s)
- Gnanasekaran Munusamy
- Advanced Materials Laboratory, School of Physical Sciences , Periyar University , Salem 636011 , Tamilnadu , India
| | - Rajaboopathi Mani
- Centre for Research and Development, Department of Physics , PRIST deemed to be University , Thanjavur 613403 , Tamilnadu , India.,Department of Chemical and Metallurgical Engineering, School of Chemical Engineering , Aalto University , P.O. Box 16100, FI-00076 Aalto , Espoo , Finland
| | - Krishnakumar Varadharajan
- Advanced Materials Laboratory, School of Physical Sciences , Periyar University , Salem 636011 , Tamilnadu , India
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Walters G, Wei M, Voznyy O, Quintero-Bermudez R, Kiani A, Smilgies DM, Munir R, Amassian A, Hoogland S, Sargent E. The quantum-confined Stark effect in layered hybrid perovskites mediated by orientational polarizability of confined dipoles. Nat Commun 2018; 9:4214. [PMID: 30310072 PMCID: PMC6181967 DOI: 10.1038/s41467-018-06746-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 09/25/2018] [Indexed: 11/19/2022] Open
Abstract
The quantum-confined Stark effect (QCSE) is an established optical modulation mechanism, yet top-performing modulators harnessing it rely on costly fabrication processes. Here, we present large modulation amplitudes for solution-processed layered hybrid perovskites and a modulation mechanism related to the orientational polarizability of dipolar cations confined within these self-assembled quantum wells. We report an anomalous (blue-shifting) QCSE for layers that contain methylammonium cations, in contrast with cesium-containing layers that show normal (red-shifting) behavior. We attribute the blue-shifts to an extraordinary diminution in the exciton binding energy that arises from an augmented separation of the electron and hole wavefunctions caused by the orientational response of the dipolar cations. The absorption coefficient changes, realized by either the red- or blue-shifts, are the strongest among solution-processed materials at room temperature and are comparable to those exhibited in the highest-performing epitaxial compound semiconductor heterostructures.
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Affiliation(s)
- G Walters
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - M Wei
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - O Voznyy
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - R Quintero-Bermudez
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - A Kiani
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - D-M Smilgies
- CHESS Wilson Laboratory, Cornell University, 161 Synchrotron Drive, Ithaca, NY, 14853, USA
| | - R Munir
- Physical and Engineering Sciences Division, KAUST Solar Center (KSU), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - A Amassian
- Physical and Engineering Sciences Division, KAUST Solar Center (KSU), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
| | - S Hoogland
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada
| | - E Sargent
- Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada.
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Glutsch S, Chemla DS, Bechstedt F. Numerical calculation of the optical absorption in semiconductor quantum structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:11592-11601. [PMID: 9984948 DOI: 10.1103/physrevb.54.11592] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kemerink M, Koenraad PM, Wolter JH. Effect of strain on a second-order van Hove singularity in AlxGa1-xAs/InyGa1-yAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10644-10651. [PMID: 9984861 DOI: 10.1103/physrevb.54.10644] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ivchenko EL, Kaminski AY, Rössler U. Heavy-light hole mixing at zinc-blende (001) interfaces under normal incidence. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:5852-5859. [PMID: 9986551 DOI: 10.1103/physrevb.54.5852] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Glutsch S, Chemla DS. Transition to one-dimensional behavior in the optical absorption of quantum-well wires. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:15902-15908. [PMID: 9983429 DOI: 10.1103/physrevb.53.15902] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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