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Parobek D, Qiao T, Son DH. Energetic hot electrons from exciton-to-hot electron upconversion in Mn-doped semiconductor nanocrystals. J Chem Phys 2019; 151:120901. [PMID: 31575181 DOI: 10.1063/1.5119398] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Generation of hot electrons and their utilization in photoinduced chemical processes have been the subjects of intense research in recent years mostly exploring hot electrons in plasmonic metal nanostructures created via decay of optically excited plasmon. Here, we present recent progress made in generation and utilization of a different type of hot electrons produced via biphotonic exciton-to-hot electron "upconversion" in Mn-doped semiconductor nanocrystals. Compared to the plasmonic hot electrons, those produced via biphotonic upconversion in Mn-doped semiconductor nanocrystals possess much higher energy, enabling more efficient long-range electron transfer across the high energy barrier. They can even be ejected above the vacuum level creating photoelectrons, which can possibly produce solvated electrons. Despite the biphotonic nature of the upconversion process, hot electrons can be generated with weak cw excitation equivalent to the concentrated solar radiation without requiring intense or high-energy photons. This perspective reviews recent work elucidating the mechanism of generating energetic hot electrons in Mn-doped semiconductor nanocrystals, detection of these hot electrons as photocurrent or photoelectron emission, and their utilization in chemical processes such as photocatalysis. New opportunities that the energetic hot electrons can open by creating solvated electrons, which can be viewed as the longer-lived and mobile version of hot electrons more useful for chemical processes, and the challenges in practical utilization of energetic hot electrons are also discussed.
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Affiliation(s)
- David Parobek
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Tian Qiao
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Dong Hee Son
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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Pang Y, Zhang M, Chen D, Chen W, Wang F, Anwar SJ, Saunders M, Rowles MR, Liu L, Liu S, Sitt A, Li C, Jia G. Why Do Colloidal Wurtzite Semiconductor Nanoplatelets Have an Atomically Uniform Thickness of Eight Monolayers? J Phys Chem Lett 2019; 10:3465-3471. [PMID: 31184156 DOI: 10.1021/acs.jpclett.9b01195] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Herein we employed a first-principles method based on density functional theory to investigate the surface energy and growth kinetics of wurtzite nanoplatelets to elucidate why nanoplatelets exhibit a uniform thickness of eight monolayers. We synthesized a series of wurtzite nanoplatelets (ZnSe, ZnS, ZnTe, and CdSe) with an atomically uniform thickness of eight monolayers. As a representative example, the growth mechanism of 1.39 nm thick (eight monolayers) wurtzite ZnSe nanoplatelets was studied to substantiate the proposed growth kinetics. The results show that the growth of the seventh and eighth layers along the [112̅0] direction of 0.99 nm (six monolayers) ZnSe magic-size nanoclusters is accessible, whereas the growth of the ninth layer is unlikely to occur because the formation energy is large. This work not only gives insights into the synthesis of atomically uniform thick wurtzite semiconductor nanoplatelets but also opens up new avenues to their applications in light-emitting diodes, catalysis, detectors, and lasers.
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Affiliation(s)
- Yingping Pang
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
| | - Minyi Zhang
- State Key Laboratory of Structural Chemistry , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China
| | - Dechao Chen
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
| | - Wei Chen
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
| | - Fei Wang
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
| | - Shaghraf Javaid Anwar
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
| | - Martin Saunders
- Centre for Microscopy, Characterization and Analysis (CMCA) and School of Molecular Sciences , The University of Western Australia , Crawley , WA 6009 , Australia
| | - Matthew R Rowles
- Department of Physics and Astronomy , Curtin University , Bentley , WA 6102 , Australia
| | - Lihong Liu
- WA School of Mines: Minerals, Energy and Chemical Engineering , Curtin University , Bentley , WA 6102 , Australia
| | - Shaomin Liu
- WA School of Mines: Minerals, Energy and Chemical Engineering , Curtin University , Bentley , WA 6102 , Australia
| | - Amit Sitt
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry , Tel Aviv University , Tel Aviv 6997801 , Israel
| | - Chunsen Li
- State Key Laboratory of Structural Chemistry , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China
- Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry , Xiamen , Fujian 361005 , China
| | - Guohua Jia
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences , Curtin University , Bentley , WA 6102 , Australia
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Pradhan N, Das Adhikari S, Nag A, Sarma DD. Luminescence, Plasmonic, and Magnetic Properties of Doped Semiconductor Nanocrystals. Angew Chem Int Ed Engl 2017; 56:7038-7054. [DOI: 10.1002/anie.201611526] [Citation(s) in RCA: 168] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/18/2017] [Indexed: 12/25/2022]
Affiliation(s)
- Narayan Pradhan
- Department of Materials Science; Indian Association for the Cultivation of Science; Kolkata 700032 India
| | - Samrat Das Adhikari
- Department of Materials Science; Indian Association for the Cultivation of Science; Kolkata 700032 India
| | - Angshuman Nag
- Department of Chemistry and Centre for Energy Science; Indian Institute of Science Education and Research, IISER; Pune 411008 India
| | - D. D. Sarma
- Solid State and Structural Chemistry Unit; Indian Institute of Science; Bengaluru 560012 India
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Pradhan N, Das Adhikari S, Nag A, Sarma DD. Dotierte Halbleiter-Nanokristalle: Lumineszenz, plasmonische und magnetische Eigenschaften. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611526] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Narayan Pradhan
- Department of Materials Science; Indian Association for the Cultivation of Science; Kolkata 700032 Indien
| | - Samrat Das Adhikari
- Department of Materials Science; Indian Association for the Cultivation of Science; Kolkata 700032 Indien
| | - Angshuman Nag
- Department of Chemistry and Centre for Energy Science; Indian Institute of Science Education and Research, IISER; Pune 411008 Indien
| | - D. D. Sarma
- Solid State and Structural Chemistry Unit; Indian Institute of Science; Bengaluru 560012 Indien
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