Photoexcited Free Carrier Dynamics in Bi2Se3, (Bi0.75In0.25)2Se3, and (Bi0.50In0.50)2Se3: From Topological to Band Insulator

ACS Photonics ◽  
2020 ◽  
Vol 7 (10) ◽  
pp. 2778-2786
Author(s):  
Teng Shi ◽  
Kateryna Kushnir ◽  
Zhengtianye Wang ◽  
Stephanie Law ◽  
Lyubov V. Titova
Keyword(s):  
Free Carrier ◽  
Carrier Dynamics ◽  
Band Insulator

scholarly journals Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuejian Ma ◽  
Fei Zhang ◽  
Zhaodong Chu ◽  
Ji Hao ◽  
Xihan Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cell ◽  
Relaxation Times ◽  
Charge Trapping ◽  
Free Carrier ◽  
Carrier Dynamics ◽  
Electron Hole ◽  
Inorganic Hybrid ◽  
Diffusion Dynamics ◽  
The Difference

AbstractThe outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI3 thin films by spatiotemporal photoconductivity imaging. Using charge transport layers to selectively quench one type of carriers, we show that the two relaxation times on the order of 1 μs and 10 μs correspond to the lifetimes of electrons and holes in FACsPbI3, respectively. Strikingly, the diffusion mapping indicates that the difference in electron/hole lifetimes is largely compensated by their disparate mobility. Consequently, the long diffusion lengths (3~5 μm) of both carriers are comparable to each other, a feature closely related to the unique charge trapping and de-trapping processes in hybrid trihalide perovskites. Our results unveil the origin of superior diffusion dynamics in this material, crucially important for solar-cell applications.

Ultrafast Carrier Dynamics in (Bi1-xInx)2Se3 Thin Films: From Topological to Band Insulator

2021 ◽  
Author(s):  
Kateryna Kushnir ◽  
Teng Shi ◽  
Zhengtianye Wang ◽  
Stephanie Law ◽  
Lyubov Titova
Keyword(s):  
Thin Films ◽  
Carrier Dynamics ◽  
Ultrafast Carrier Dynamics ◽  
Ultrafast Carrier ◽  
Band Insulator

scholarly journals Free-carrier dynamics in Au2Pb probed by optical conductivity measurements

2018 ◽  
Vol 30 (48) ◽  
pp. 485403 ◽  
Author(s):  
R Kemmler ◽  
R Hübner ◽  
A Löhle ◽  
D Neubauer ◽  
I Voloshenko ◽  
...  
Keyword(s):  
Optical Conductivity ◽  
Free Carrier ◽  
Carrier Dynamics ◽  
Conductivity Measurements

Chirp Control of Free Carrier Dynamics in GaAs

2005 ◽  
pp. 337-339
Author(s):  
Toshiaki Hattori ◽  
Takeshi Yogi ◽  
Yoshikazu Hama ◽  
Naoki Watanabe
Keyword(s):  
Free Carrier ◽  
Carrier Dynamics

The Ultrafast Carrier Dynamics in Semiconductors: The Role of Defects

1995 ◽  
Vol 378 ◽  
Author(s):  
P. M. Fauchet ◽  
G. W. Wicks ◽  
Y. Kostoulas ◽  
A. I. Lobad ◽  
K. B. Ucer
Keyword(s):  
Low Temperature ◽  
Amorphous Silicon ◽  
Point Defects ◽  
Free Carrier ◽  
Carrier Dynamics ◽  
Ultrafast Laser ◽  
Ultrafast Laser Spectroscopy ◽  
Ultrafast Carrier ◽  
Scattering Time

AbstractThe presence of point defects is expected to influence the properties of free carrier in semiconductors. We have used the techniques of ultrafast laser spectroscopy to characterize the dynamics of photoinjected carriers in several III–V semiconductors grown at low temperature. The initial scattering time and the lifetime of the carriers become very short at low growth temperatures. Results obtained with low-temperature grown III–Vs are compared to those obtained with III–Vs grown at normal temperatures and amorphous silicon.

Free carrier dynamics of InN nanorods investigated by time-resolved terahertz spectroscopy

2009 ◽  
Vol 105 (2) ◽  
pp. 023707 ◽  
Author(s):  
H. Ahn ◽  
C.-H. Chuang ◽  
Y.-P. Ku ◽  
C.-L. Pan
Keyword(s):  
Terahertz Spectroscopy ◽  
Free Carrier ◽  
Carrier Dynamics ◽  
Time Resolved
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