scholarly journals Elucidating the role of disorder and free-carrier recombination kinetics in CH3NH3PbI3 perovskite films

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Chan La-o-vorakiat ◽  
Teddy Salim ◽  
Jeannette Kadro ◽  
Mai-Thu Khuc ◽  
Reinhard Haselsberger ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Terahertz Spectroscopy ◽  
Free Carrier ◽  
Charge Carriers ◽  
Time Resolved ◽  
Broadband Absorption ◽  
Carrier Recombination ◽  
Mobility Of Charge Carriers ◽  
Three Body ◽  
Body Recombination

Abstract Apart from broadband absorption of solar radiation, the performance of photovoltaic devices is governed by the density and mobility of photogenerated charge carriers. The latter parameters indicate how many free carriers move away from their origin, and how fast, before loss mechanisms such as carrier recombination occur. However, only lower bounds of these parameters are usually obtained. Here we independently determine both density and mobility of charge carriers in a perovskite film by the use of time-resolved terahertz spectroscopy. Our data reveal the modification of the free carrier response by strong backscattering expected from these heavily disordered perovskite films. The results for different phases and different temperatures show a change of kinetics from two-body recombination at room temperature to three-body recombination at low temperatures. Our results suggest that perovskite-based solar cells can perform well even at low temperatures as long as the three-body recombination has not become predominant.

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

scholarly journals Hybrid Perovskite Terahertz Photoconductive Antenna

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 313
Author(s):  
Petr A. Obraztsov ◽  
Vladislava V. Bulgakova ◽  
Pavel A. Chizhov ◽  
Alexander A. Ushakov ◽  
Dmitry S. Gets ◽  
...  
Keyword(s):  
Low Cost ◽  
Optical Excitation ◽  
Bias Field ◽  
Charge Carriers ◽  
Time Resolved ◽  
Hybrid Perovskite ◽  
Mobility Of Charge Carriers ◽  
Photovoltaic Applications ◽  
Halide Perovskites ◽  
Thz Applications

Hybrid organic–inorganic perovskites, while well examined for photovoltaic applications, remain almost completely unexplored in the terahertz (THz) range. These low-cost hybrid materials are extremely attractive for THz applications because their optoelectronic properties can be chemically engineered with relative ease. Here, we experimentally demonstrate the first attempt to apply solution-processed polycrystalline films of hybrid perovskites for the development of photoconductive terahertz emitters. By using the widely studied methylammonium-based perovskites MAPbI3 and MAPbBr3, we fabricate and characterize large-aperture photoconductive antennas. The work presented here examines polycrystalline perovskite films excited both above and below the bandgap, as well as the scaling of THz emission with the applied bias field and the optical excitation fluence. The combination of ultrafast time-resolved spectroscopy and terahertz emission experiments allows us to determine the still-debated room temperature carrier lifetime and mobility of charge carriers in halide perovskites using an alternative noninvasive method. Our results demonstrate the applicability of hybrid perovskites for the development of scalable THz photoconductive devices, making these materials competitive with conventional semiconductors for THz emission.

TRANSIT TIME DISTRIBUTION AND MOBILITY IN MONTE CARLO SIMULATIONS OF THE GAUSSIAN DISORDER MODEL

2013 ◽  
Vol 27 (05) ◽  
pp. 1350010 ◽  
Author(s):  
SUNIL KIM ◽  
JOONHYUN YEO ◽  
CHAN IM
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Transit Time ◽  
Low Temperatures ◽  
Heavy Tail ◽  
Charge Carriers ◽  
Dispersive Transport ◽  
Transit Times ◽  
Mobility Of Charge Carriers ◽  
Gaussian Disorder Model

We study the distribution of transit times in Monte Carlo simulations of the Gaussian disorder model (GDM). The GDM is one of the most successful models to describe the charge transport in random organic materials. The transit time is the time it takes for a charge carrier to travel across a sample. We find that the distribution of transit times over many charge carriers and over different realizations of Gaussian energies shows a heavy tail in the long time limit at low temperatures. This heavy tail can be described by a power law with an exponent that depends on temperature. This sets a limitation on the calculation of mobility of charge carriers using an average transit time at low temperatures. We discuss the implication of these results on dispersive transport.

scholarly journals Photogeneration and Mobility of Charge Carriers in Atomically Thin Colloidal InSe Nanosheets Probed by Ultrafast Terahertz Spectroscopy

2016 ◽  
Vol 7 (20) ◽  
pp. 4191-4196 ◽  
Author(s):  
Jannika Lauth ◽  
Aditya Kulkarni ◽  
Frank C. M. Spoor ◽  
Nicolas Renaud ◽  
Ferdinand C. Grozema ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Charge Carriers ◽  
Mobility Of Charge Carriers

scholarly journals Time-Resolved Terahertz Spectroscopy of Free Carrier Nonlinear Dynamics in Semiconductors

2010 ◽  
Vol 2 (4) ◽  
pp. 578-592 ◽  
Author(s):  
G Sharma ◽  
L Razzari ◽  
F H Su ◽  
F Blanchard ◽  
A Ayesheshim ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Terahertz Spectroscopy ◽  
Free Carrier ◽  
Time Resolved

Recombination of Optically Excited Carriers in a-Si:H at Low temperatures and Intermediate Times

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Whitaker ◽  
T. Su ◽  
P. C. Taylor
Keyword(s):  
Electron Spin Resonance ◽  
Low Temperatures ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Dipolar Relaxation ◽  
Spin Lattice ◽  
Carrier Recombination ◽  
Nmr Data ◽  
Spin Resonance ◽  
Time Regime

AbstractOptically induced electron spin resonance (LESR) studies on time scales in between the previously published PL and LESR results (approximately 10 ms to 10 s) allow one to examine the cross over between energy-loss (downward) hopping of carriers and carrier recombination via tunneling. In addition, data in this time regime are directly compared in the same sample with NMR data on the dipolar spin-lattice relaxation of the bonded hydrogen where light induced electrons and holes are responsible for dipolar relaxation of bonded hydrogen. The LESR results confirm the interpretation of the NMR measurements.

Sign in / Sign up

Export Citation Format

Share Document