Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire
We measure ultrafast carrier dynamics in a single CdSSe nanowire at different excitation fluences using an ultrafast Kerr-gated microscope. The time-resolved emission exhibits a dependence on excitation fluence, with the onset of the emission varying on the picosecond time scale with increasing lase...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Journal of Spectroscopy |
| Online Access: | http://dx.doi.org/10.1155/2015/574754 |
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| _version_ | 1832550681471352832 |
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| author | Peter S. Eldridge Jolie C. Blake Lars Gundlach |
| author_facet | Peter S. Eldridge Jolie C. Blake Lars Gundlach |
| author_sort | Peter S. Eldridge |
| collection | DOAJ |
| description | We measure ultrafast carrier dynamics in a single CdSSe nanowire at different excitation fluences using an ultrafast Kerr-gated microscope. The time-resolved emission exhibits a dependence on excitation fluence, with the onset of the emission varying on the picosecond time scale with increasing laser power. By fitting the emission to a model for amplified spontaneous emission (ASE), we are able to extract the nonradiative carrier recombination lifetime and nongeminate recombination constant. The extracted nongeminate recombination constant suggests that our measurement technique allows the access to the nondiffusion limited recombination regime in nanowires with low carrier mobility. |
| format | Article |
| id | doaj-art-29375b559e3f4c3393204709177e433b |
| institution | Kabale University |
| issn | 2314-4920 2314-4939 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Spectroscopy |
| spelling | doaj-art-29375b559e3f4c3393204709177e433b2025-02-03T06:06:00ZengWileyJournal of Spectroscopy2314-49202314-49392015-01-01201510.1155/2015/574754574754Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe NanowirePeter S. Eldridge0Jolie C. Blake1Lars Gundlach2Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USADepartment of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USADepartment of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USAWe measure ultrafast carrier dynamics in a single CdSSe nanowire at different excitation fluences using an ultrafast Kerr-gated microscope. The time-resolved emission exhibits a dependence on excitation fluence, with the onset of the emission varying on the picosecond time scale with increasing laser power. By fitting the emission to a model for amplified spontaneous emission (ASE), we are able to extract the nonradiative carrier recombination lifetime and nongeminate recombination constant. The extracted nongeminate recombination constant suggests that our measurement technique allows the access to the nondiffusion limited recombination regime in nanowires with low carrier mobility.http://dx.doi.org/10.1155/2015/574754 |
| spellingShingle | Peter S. Eldridge Jolie C. Blake Lars Gundlach Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire Journal of Spectroscopy |
| title | Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire |
| title_full | Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire |
| title_fullStr | Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire |
| title_full_unstemmed | Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire |
| title_short | Ultrafast Probe of Carrier Diffusion and Nongeminate Processes in a Single CdSSe Nanowire |
| title_sort | ultrafast probe of carrier diffusion and nongeminate processes in a single cdsse nanowire |
| url | http://dx.doi.org/10.1155/2015/574754 |
| work_keys_str_mv | AT peterseldridge ultrafastprobeofcarrierdiffusionandnongeminateprocessesinasinglecdssenanowire AT joliecblake ultrafastprobeofcarrierdiffusionandnongeminateprocessesinasinglecdssenanowire AT larsgundlach ultrafastprobeofcarrierdiffusionandnongeminateprocessesinasinglecdssenanowire |