Dynamic photoelectron transport in stepwise-doped GaAs photocathodes
Abstract We present a theoretical model describing photoelectron transport dynamics in stepwise-doped GaAs photocathodes. Built-in electric field caused by the doping structure is analyzed, and the time-evolution of electron concentration in the active layer induced by a femtosecond laser pulse is s...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-16993-8 |
| _version_ | 1811222156643663872 |
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| author | Rui Zhou Hemang Jani Yijun Zhang Yunsheng Qian Lingze Duan |
| author_facet | Rui Zhou Hemang Jani Yijun Zhang Yunsheng Qian Lingze Duan |
| author_sort | Rui Zhou |
| collection | DOAJ |
| description | Abstract We present a theoretical model describing photoelectron transport dynamics in stepwise-doped GaAs photocathodes. Built-in electric field caused by the doping structure is analyzed, and the time-evolution of electron concentration in the active layer induced by a femtosecond laser pulse is solved. The predictions of the model show excellent agreement with the experimental data measured with pump-probe transient reflectometry, demonstrating the capability of the theoretical model in predicting photoelectron behaviors in real devices. Comparisons are also made between this stepwise doping model and the conventional gradient doping model with a continuous doping profile, thereby providing the first quantitative evaluation of the effectiveness and the limitation of the gradient doping model in describing actual stepwise-doped devices. |
| first_indexed | 2024-04-12T08:11:37Z |
| format | Article |
| id | doaj.art-d4c5009c59be4630be1cbb616c3eb7e8 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-12T08:11:37Z |
| publishDate | 2022-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-d4c5009c59be4630be1cbb616c3eb7e82022-12-22T03:40:56ZengNature PortfolioScientific Reports2045-23222022-07-011211810.1038/s41598-022-16993-8Dynamic photoelectron transport in stepwise-doped GaAs photocathodesRui Zhou0Hemang Jani1Yijun Zhang2Yunsheng Qian3Lingze Duan4Department of Physics & Astronomy, The University of Alabama in HuntsvilleDepartment of Physics & Astronomy, The University of Alabama in HuntsvilleSchool of Electronic and Optical Engineering, Nanjing University of Science and TechnologySchool of Electronic and Optical Engineering, Nanjing University of Science and TechnologyDepartment of Physics & Astronomy, The University of Alabama in HuntsvilleAbstract We present a theoretical model describing photoelectron transport dynamics in stepwise-doped GaAs photocathodes. Built-in electric field caused by the doping structure is analyzed, and the time-evolution of electron concentration in the active layer induced by a femtosecond laser pulse is solved. The predictions of the model show excellent agreement with the experimental data measured with pump-probe transient reflectometry, demonstrating the capability of the theoretical model in predicting photoelectron behaviors in real devices. Comparisons are also made between this stepwise doping model and the conventional gradient doping model with a continuous doping profile, thereby providing the first quantitative evaluation of the effectiveness and the limitation of the gradient doping model in describing actual stepwise-doped devices.https://doi.org/10.1038/s41598-022-16993-8 |
| spellingShingle | Rui Zhou Hemang Jani Yijun Zhang Yunsheng Qian Lingze Duan Dynamic photoelectron transport in stepwise-doped GaAs photocathodes Scientific Reports |
| title | Dynamic photoelectron transport in stepwise-doped GaAs photocathodes |
| title_full | Dynamic photoelectron transport in stepwise-doped GaAs photocathodes |
| title_fullStr | Dynamic photoelectron transport in stepwise-doped GaAs photocathodes |
| title_full_unstemmed | Dynamic photoelectron transport in stepwise-doped GaAs photocathodes |
| title_short | Dynamic photoelectron transport in stepwise-doped GaAs photocathodes |
| title_sort | dynamic photoelectron transport in stepwise doped gaas photocathodes |
| url | https://doi.org/10.1038/s41598-022-16993-8 |
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