Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique
© 2020 American Physical Society. We report three-pulse photodope-pump-probe measurements on photocarrier dynamics in semiconducting transition metal dichalcogenide monolayers of MoS2, WS2, MoSe2, and WSe2. The samples are fabricated by metal-organic chemical vapor deposition and mechanical exfolia...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/132300 |
| _version_ | 1826191315272990720 |
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| author | Valencia-Acuna, Pavel Zereshki, Peymon Tavakoli, Mohammad Mahdi Park, Ji-Hoon Kong, Jing Zhao, Hui |
| author_facet | Valencia-Acuna, Pavel Zereshki, Peymon Tavakoli, Mohammad Mahdi Park, Ji-Hoon Kong, Jing Zhao, Hui |
| author_sort | Valencia-Acuna, Pavel |
| collection | MIT |
| description | © 2020 American Physical Society. We report three-pulse photodope-pump-probe measurements on photocarrier dynamics in semiconducting transition metal dichalcogenide monolayers of MoS2, WS2, MoSe2, and WSe2. The samples are fabricated by metal-organic chemical vapor deposition and mechanical exfoliation techniques and characterized by photoluminescence spectroscopy. In the time-resolved measurement, the samples are first photodoped by a prepulse, which injects background photocarriers of various densities. A pump pulse then injects photocarriers, whose dynamics is monitored by measuring a differential reflection of a time-delayed probe pulse. We found that the ultrafast decay component of the differential reflection signal, which has been widely reported before, shows minimal dependence on the background exciton density. This observation shows that a previously suggested carrier-trapping model cannot account for this component. The results thus further support an exciton-formation model that was previously proposed based on spectroscopic evidence. |
| first_indexed | 2024-09-23T08:54:19Z |
| format | Article |
| id | mit-1721.1/132300 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:54:19Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1323002021-09-21T04:01:56Z Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique Valencia-Acuna, Pavel Zereshki, Peymon Tavakoli, Mohammad Mahdi Park, Ji-Hoon Kong, Jing Zhao, Hui © 2020 American Physical Society. We report three-pulse photodope-pump-probe measurements on photocarrier dynamics in semiconducting transition metal dichalcogenide monolayers of MoS2, WS2, MoSe2, and WSe2. The samples are fabricated by metal-organic chemical vapor deposition and mechanical exfoliation techniques and characterized by photoluminescence spectroscopy. In the time-resolved measurement, the samples are first photodoped by a prepulse, which injects background photocarriers of various densities. A pump pulse then injects photocarriers, whose dynamics is monitored by measuring a differential reflection of a time-delayed probe pulse. We found that the ultrafast decay component of the differential reflection signal, which has been widely reported before, shows minimal dependence on the background exciton density. This observation shows that a previously suggested carrier-trapping model cannot account for this component. The results thus further support an exciton-formation model that was previously proposed based on spectroscopic evidence. 2021-09-20T18:21:44Z 2021-09-20T18:21:44Z 2021-01-08T18:06:48Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132300 en 10.1103/PHYSREVB.102.035414 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Valencia-Acuna, Pavel Zereshki, Peymon Tavakoli, Mohammad Mahdi Park, Ji-Hoon Kong, Jing Zhao, Hui Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title | Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title_full | Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title_fullStr | Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title_full_unstemmed | Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title_short | Transient absorption of transition metal dichalcogenide monolayers studied by a photodope-pump-probe technique |
| title_sort | transient absorption of transition metal dichalcogenide monolayers studied by a photodope pump probe technique |
| url | https://hdl.handle.net/1721.1/132300 |
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