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Ultrafast carrier relaxation dynamics of photoexcited GaAs and GaAs/AlGaAs nanowire array
B. W. Zhang; Z. G. Nie; B. Wang; D. K. Wang; J. L. Tang; X. H. Wang; J. H. Zhang; G. C. Xing; W. C. Zhang and Z. P. Wei
2020
Source PublicationPhysical Chemistry Chemical Physics
ISSN1463-9076
Volume22Issue:44Pages:25819-25826
AbstractFemtosecond optical pump-probe spectroscopy is employed to elucidate the ultrafast carrier nonradiative relaxation dynamics of bare GaAs and a core-shell GaAs/AlGaAs semiconductor nanowire array. Different from the single nanowire conventionally used for the study of ultrafast dynamics, a simple spin coating and peeling off method was performed to prepare transparent organic films containing a vertical oriented nanowire array for transient absorption measurement. The transient experiment provides the direct observation of carrier thermalization, carrier cooling, thermal dissipation and band-gap energy evolutions along with the carrier relaxations. Carrier thermalization occurs within sub-0.5 ps and proceeds almost independently on the AlGaAs-coating, while the time constants of carrier cooling and thermal dissipation are increased by an order of magnitude due to the AlGaAs-coating effect. The concomitant band-gap evolutions in GaAs and GaAs/AlGaAs include an initial rapid red-shift in thermalization period, followed by a slow blue and/or red shift in carrier cooling, and then by an even slower blue shift in thermal dissipation. The evolution is explained by the competition of band-gap renormalization, plasma screening and band-filling. These findings are significant for understanding the basic physics of carrier scattering, and also for the development of flexible optoelectronic devices.
DOI10.1039/d0cp04250a
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Indexed BySCI ; EI
Language英语
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Document Type期刊论文
Identifierhttp://ir.ciomp.ac.cn/handle/181722/64987
Collection中国科学院长春光学精密机械与物理研究所
Recommended Citation
GB/T 7714
B. W. Zhang,Z. G. Nie,B. Wang,et al. Ultrafast carrier relaxation dynamics of photoexcited GaAs and GaAs/AlGaAs nanowire array[J]. Physical Chemistry Chemical Physics,2020,22(44):25819-25826.
APA B. W. Zhang.,Z. G. Nie.,B. Wang.,D. K. Wang.,J. L. Tang.,...&W. C. Zhang and Z. P. Wei.(2020).Ultrafast carrier relaxation dynamics of photoexcited GaAs and GaAs/AlGaAs nanowire array.Physical Chemistry Chemical Physics,22(44),25819-25826.
MLA B. W. Zhang,et al."Ultrafast carrier relaxation dynamics of photoexcited GaAs and GaAs/AlGaAs nanowire array".Physical Chemistry Chemical Physics 22.44(2020):25819-25826.
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