Ultrafast Optical-Pump THz-Probe Spectroscopy of the Carrier Dynamics in Oriented Germanium Nanowires

2009 ◽  
Author(s):  
Jared H. Strait ◽  
Paul A. George ◽  
Farhan Rana ◽  
Mark Levendorf ◽  
Martin Blood-Forsythe ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Germanium Nanowires ◽  
Ultrafast Optical ◽  
Probe Spectroscopy

scholarly journals Measurements of the Carrier Dynamics and Terahertz Response of Oriented Germanium Nanowires using Optical-Pump Terahertz-Probe Spectroscopy

Nano Letters ◽  
2009 ◽  
Vol 9 (8) ◽  
pp. 2967-2972 ◽  
Author(s):  
Jared H. Strait ◽  
Paul A. George ◽  
Mark Levendorf ◽  
Martin Blood-Forsythe ◽  
Farhan Rana ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Germanium Nanowires ◽  
Probe Spectroscopy

Carrier Dynamics in Self-Assembled ErAs Nanoislands Measured by Optical Pump-THz Probe Spectroscopy

2005 ◽  
Author(s):  
R. P. Prasankumar ◽  
A. Scopatz ◽  
D. J. Hilton ◽  
A. J. Taylor ◽  
R. D. Averitt ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Self Assembled ◽  
Probe Spectroscopy

Carrier dynamics in self-assembled ErAs nanoislands embedded in GaAs measured by optical-pump terahertz-probe spectroscopy

2005 ◽  
Vol 86 (20) ◽  
pp. 201107 ◽  
Author(s):  
R. P. Prasankumar ◽  
A. Scopatz ◽  
D. J. Hilton ◽  
A. J. Taylor ◽  
R. D. Averitt ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Self Assembled ◽  
Probe Spectroscopy

scholarly journals Nonequilibrium Carrier Dynamics Studied in Underdoped Bi2212 by Polarized Optical Pump-Probe Spectroscopy

2009 ◽  
Vol 23 (5) ◽  
pp. 871-872
Author(s):  
Y. Toda ◽  
J. Sekiya ◽  
Y. H. Liu ◽  
N. Momono ◽  
M. Oda ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Nonequilibrium Carrier ◽  
Optical Pump ◽  
Pump Probe ◽  
Probe Spectroscopy

scholarly journals Phase segregation in mixed-halide perovskites affects charge-carrier dynamics while preserving mobility

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Silvia G. Motti ◽  
Jay B. Patel ◽  
Robert D. J. Oliver ◽  
Henry J. Snaith ◽  
Michael B. Johnston ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Management Strategies ◽  
Phase Segregation ◽  
Carrier Dynamics ◽  
Optical Pump ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
Probe Spectroscopy ◽  
The Impact

AbstractMixed halide perovskites can provide optimal bandgaps for tandem solar cells which are key to improved cost-efficiencies, but can still suffer from detrimental illumination-induced phase segregation. Here we employ optical-pump terahertz-probe spectroscopy to investigate the impact of halide segregation on the charge-carrier dynamics and transport properties of mixed halide perovskite films. We reveal that, surprisingly, halide segregation results in negligible impact to the THz charge-carrier mobilities, and that charge carriers within the I-rich phase are not strongly localised. We further demonstrate enhanced lattice anharmonicity in the segregated I-rich domains, which is likely to support ionic migration. These phonon anharmonicity effects also serve as evidence of a remarkably fast, picosecond charge funnelling into the narrow-bandgap I-rich domains. Our analysis demonstrates how minimal structural transformations during phase segregation have a dramatic effect on the charge-carrier dynamics as a result of charge funnelling. We suggest that because such enhanced recombination is radiative, performance losses may be mitigated by deployment of careful light management strategies in solar cells.

Photoinduced carrier dynamics in bulk ZnTe using optical-pump terahertz-probe spectroscopy

2020 ◽  
Vol 59 (05) ◽  
pp. 1 ◽  
Author(s):  
Hu Deng ◽  
Linyu Chen ◽  
Weiwei Qu ◽  
Quancheng Liu ◽  
Samuel Danso ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Probe Spectroscopy

Ultrafast optical-pump terahertz-probe spectroscopy of individual silicon nanowires

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
Taeyong Kim ◽  
Sangwan Sim ◽  
Jungmok Seo ◽  
Jaehong Lee ◽  
Heetak Han ◽  
...  
Keyword(s):  
Silicon Nanowires ◽  
Optical Pump ◽  
Ultrafast Optical ◽  
Probe Spectroscopy

scholarly journals Understanding Multiferroic Hexagonal Manganites by Static and Ultrafast Optical Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Yu Ting Wang ◽  
Chih Wei Luo ◽  
Takayoshi Kobayashi
Keyword(s):  
Electronic Structure ◽  
Magnetic Ordering ◽  
Optical Pump ◽  
Pump Probe ◽  
Spin Lattice ◽  
Ultrafast Optical ◽  
Ultrafast Optical Spectroscopy ◽  
Hexagonal Manganites ◽  
Spin Charge Coupling ◽  
Probe Spectroscopy

Multiferroic hexagonal manganites ReMnO3studied by optics are reviewed. Their electronic structures were revealed by static linear and nonlinear spectra. Two transitions located at~1.7 eV and~2.3 eV have been observed and attributed to the interband transitions from the lower-lying Mn3+dxy/dx2-y2anddxz/dyzstates to the Mn3+d3z2-r2state, respectively. These so-called d-d transitions exhibit a blueshift as decreasing temperatures and an extra blueshift nearTN. This dramatic change indicates that the magnetic ordering seriously influences the electronic structure. On the other hand, the ultrafast optical pump-probe spectroscopy has provided the important information on spin-charge coupling and spin-lattice coupling. Because of the strongly correlation between electronic structure and magnetic ordering, the amplitude of the initial rising component inΔR/Rshows striking changes at the vicinity ofTN. Moreover, the coherent optical and acoustic phonons were observed on optical pump-probe spectroscopy. Both the amplitude and dephasing time of coherent phonons also exhibit significant changes atTN, which provide the evidence for spin-lattice interaction in these intriguing materials.

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