Ultrafast carrier transport in GaAs measured by optical pump-terahertz probe spectroscopy

2009 ◽  
Author(s):  
Hai-yan Yang ◽  
Yu-lei Shi ◽  
Qing-li Zhou ◽  
Dong-mei Zhao ◽  
Lei Li ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Optical Pump ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy

Limits of Charge Carrier Transport in Halide Perovskites Revealed by Optical-Pump Terahertz-Probe Spectroscopy

2019 ◽  
Author(s):  
Hannes Hempel ◽  
Andrei Petsiu ◽  
Martin Stolterfoht ◽  
Pascal Becker ◽  
Dieter Neher ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Transport ◽  
Charge Carrier Transport ◽  
Optical Pump ◽  
Halide Perovskites ◽  
Probe Spectroscopy

scholarly journals Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene

2008 ◽  
Vol 1081 ◽  
Author(s):  
Jahan M. Dawlaty ◽  
Shriram Shivaraman ◽  
Mvs Chandrashekhar ◽  
Michael G. Spencer ◽  
Farhan Rana
Keyword(s):  
Relaxation Times ◽  
Epitaxial Graphene ◽  
Optical Pump ◽  
Carrier Relaxation ◽  
Pump Probe ◽  
Graphene Layers ◽  
Ultrafast Optical ◽  
Interband Scattering ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy

ABSTRACTUsing ultrafast optical pump-probe spectroscopy, we have measured carrier relaxation times in epitaxial graphene layers grown on SiC wafers. We find two distinct time scales associated with the relaxation of nonequilibrium photogenerated carriers. An initial fast relaxation transient in the 70-120 fs range is followed by a slower relaxation process in the 0.4-1.7 ps range. The slower relaxation time is found to be inversely proportional to the degree of crystalline disorder in the graphene layers as measured by Raman spectroscopy. We relate the measured fast and slow time constants to carrier-carrier and carrier-phonon intraband and interband scattering processes in graphene.

scholarly journals Terahertz Emission and Ultrafast Carrier Dynamics of Ar-Ion Implanted Cu(In,Ga)Se2 Thin Films

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 411
Author(s):  
Chul Kang ◽  
Gyuseok Lee ◽  
Woo-Jung Lee ◽  
Dae-Hyung Cho ◽  
Inhee Maeng ◽  
...  
Keyword(s):  
Thin Films ◽  
Carrier Dynamics ◽  
Thz Radiation ◽  
Terahertz Emission ◽  
Optical Pump ◽  
Carrier Scattering ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy ◽  
Surge Current ◽  
Ion Implanted

We investigated THz emission from Ar-ion-implanted Cu(In,Ga)Se2 (CIGS) films. THz radiation from the CIGS films increases as the density of implanted Ar ions increases. This is because Ar ions contribute to an increase in the surface surge current density. The effect of Ar-ion implantation on the carrier dynamics of CIGS films was also investigated using optical pump THz probe spectroscopy. The fitted results imply that implanted Ar ions increase the charge transition of intra-and carrier–carrier scattering lifetimes and decrease the bandgap transition lifetime.

Na-Dependent Ultrafast Carrier Dynamics of CdS/Cu(In,Ga)Se2 Measured by Optical Pump-Terahertz Probe Spectroscopy

2015 ◽  
Vol 119 (35) ◽  
pp. 20231-20236 ◽  
Author(s):  
Woo-Jung Lee ◽  
Dae-Hyung Cho ◽  
Jae-Hyung Wi ◽  
Won Seok Han ◽  
Yong-Duck Chung ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Ultrafast Carrier Dynamics ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy

Pump fluence dependence of ultrafast carrier dynamics in InSb measured by optical pump–terahertz probe spectroscopy

2018 ◽  
Vol 57 (33) ◽  
pp. 9729 ◽  
Author(s):  
Gaofang Li ◽  
Wei Zhou ◽  
Wenjie Zhang ◽  
Guohong Ma ◽  
Haoyang Cui ◽  
...  
Keyword(s):  
Carrier Dynamics ◽  
Optical Pump ◽  
Ultrafast Carrier Dynamics ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy ◽  
Fluence Dependence

Limits of Charge Carrier Transport in Halide Perovskites Revealed by Optical-Pump Terahertz-Probe Spectroscopy

2019 ◽  
Author(s):  
Hannes Hempel ◽  
Andrei Petsiu ◽  
Martin Stolterfoht ◽  
Pascal Becker ◽  
Dieter Neher ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Transport ◽  
Charge Carrier Transport ◽  
Optical Pump ◽  
Halide Perovskites ◽  
Probe Spectroscopy

Dirac Surface Plasmons in Photoexcited Bismuth Telluride Nanowires : Optical Pump-Terahertz Probe Spectroscopy

Nanoscale ◽  
2021 ◽  
Author(s):  
Mithun K P ◽  
Srabani Kar ◽  
Abinash Kumar ◽  
Victor Suvisesha Muthu Dharmaraj ◽  
Ravishankar Narayanan ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Bismuth Telluride ◽  
Topological Insulators ◽  
Collective Excitation ◽  
Optical Pump ◽  
Time Resolved ◽  
Mid Infrared ◽  
Plasmonic Materials ◽  
Probe Spectroscopy

Collective excitation of Dirac plasmons in graphene and topological insulators have opened new possibilities of tunable plasmonic materials ranging from THz to mid-infrared regions. Using time resolved Optical Pump -...

Photocarriers dynamics in silicon wafer studied with optical-pump terahertz-probe spectroscopy

2012 ◽  
Vol 285 (20) ◽  
pp. 4102-4106 ◽  
Author(s):  
Gaofang Li ◽  
Dong Li ◽  
Zuanming Jin ◽  
Guohong Ma
Keyword(s):  
Silicon Wafer ◽  
Optical Pump ◽  
Probe Spectroscopy
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