Carrier-Specific Hot Phonon Bottleneck in CH3NH3PbI3 Revealed by Femtosecond XUV Absorption

2021 ◽  
Author(s):  
Max Verkamp ◽  
Joshua Leveillee ◽  
Aastha Sharma ◽  
Ming-Fu Lin ◽  
André Schleife ◽  
...  
Keyword(s):  
Phonon Bottleneck

Relaxation and phonon bottleneck of 169Tm nuclear spins in TmPO 4 : evidence for the direct process ?

1985 ◽  
Vol 46 (10) ◽  
pp. 1699-1708 ◽  
Author(s):  
Y. Roinel ◽  
V. Bouffard ◽  
J.-F. Jacquinot ◽  
C. Fermon ◽  
G. Fournier
Keyword(s):  
Nuclear Spins ◽  
Direct Process ◽  
Phonon Bottleneck

scholarly journals Reciprocating Thermal Behavior in Multichannel Relaxation of Cobalt(II) Based Single Ion Magnets

2021 ◽  
Vol 7 (6) ◽  
pp. 76
Author(s):  
Cyril Rajnák ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Thermal Behavior ◽  
Magnetic Relaxation ◽  
Additional Term ◽  
Negative Temperature ◽  
Point Of View ◽  
Magnetic Data ◽  
Phonon Bottleneck ◽  
Slow Magnetic Relaxation ◽  
Relaxation Channel ◽  
Frequency Relaxation

A series of mononuclear Co(II) complexes showing slow magnetic relaxation is assessed from the point of view of relaxation mechanisms. In certain cases, the reciprocating thermal behavior is detected: On cooling, the slow relaxation time is prolonged until a certain limit and then, unexpectedly, is accelerated. The low-temperature magnetic data can be successfully fitted by assuming Raman and/or phonon bottleneck mechanisms of the slow magnetic relaxation for the high-frequency relaxation channel. An additional term with the negative temperature exponent is capable of reproducing the whole experimental dataset.

Exciton Cooling in 2D Perovskite Nanoplatelets: Rationalized Carrier-Induced Stark and Phonon Bottleneck Effects

2022 ◽  
pp. 393-399
Author(s):  
Carolina Villamil Franco ◽  
Gaëlle Trippé-Allard ◽  
Benoît Mahler ◽  
Christian Cornaggia ◽  
Jean-Sébastien Lauret ◽  
...  
Keyword(s):  
Phonon Bottleneck

scholarly journals Acoustic-optical phonon up-conversion and hot-phonon bottleneck in lead-halide perovskites

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Jianfeng Yang ◽  
Xiaoming Wen ◽  
Hongze Xia ◽  
Rui Sheng ◽  
Qingshan Ma ◽  
...  
Keyword(s):  
Optical Phonon ◽  
Phonon Bottleneck ◽  
Halide Perovskites ◽  
Lead Halide

scholarly journals Observation of a phonon bottleneck in copper-doped colloidal quantum dots

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Lifeng Wang ◽  
Zongwei Chen ◽  
Guijie Liang ◽  
Yulu Li ◽  
Runchen Lai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Phonon Scattering ◽  
Photochemical Reactions ◽  
Hot Electrons ◽  
Colloidal Quantum Dots ◽  
Hot Electron ◽  
Electron Cooling ◽  
Phonon Bottleneck ◽  
Cooling Mechanism

Abstract Hot electrons can dramatically improve the efficiency of solar cells and sensitize energetically-demanding photochemical reactions. Efficient hot electron devices have been hindered by sub-picosecond intraband cooling of hot electrons in typical semiconductors via electron-phonon scattering. Semiconductor quantum dots were predicted to exhibit a “phonon bottleneck” for hot electron relaxation as their quantum-confined electrons would couple very inefficiently to phonons. However, typical cadmium selenide dots still exhibit sub-picosecond hot electron cooling, bypassing the phonon bottleneck possibly via an Auger-like process whereby the excessive energy of the hot electron is transferred to the hole. Here we demonstrate this cooling mechanism can be suppressed in copper-doped cadmium selenide colloidal quantum dots due to femtosecond hole capturing by copper-dopants. As a result, we observe a lifetime of ~8.6 picosecond for 1Pe hot electrons which is more than 30-fold longer than that in same-sized, undoped dots (~0.25 picosecond).

Thermoelectric Transport in Sb2Te3/Bi2Te3 Quantum Dot Nanocomposites

2011 ◽  
Author(s):  
J. Zhou ◽  
R. G. Yang
Keyword(s):  
Quantum Dot ◽  
Transport Properties ◽  
High Efficiency ◽  
Phonon Scattering ◽  
Transport Model ◽  
Binding Model ◽  
Thermoelectric Transport ◽  
Bottleneck Effect ◽  
Phonon Bottleneck ◽  
Thermoelectric Transport Properties

We investigate the thermoelectric transport properties of Sb2Te3/Bi2Te3 quantum dot nanocomposites with spherical Sb2Te3 quantum dots arrays embedded in Bi2Te3 matrix through a two-channel transport model. In this model, the transport of quantum-confined electrons through the hopping mechanism is studied by tight-binding model together with Kubo formula and Green’s function method. The formation of minibands due to the quantum confinement and the phonon-bottleneck effect on carrier-phonon scattering are considered. The transport of bulk-like electrons is studied by Boltzmann-transport-equation-based model. We consider the intrinsic carrier scatterings as well as the carrier-interface scattering of these bulk-like electrons. Thermoelectric transport properties are studied with different quantum dot sizes, inter-dot distances, doping concentrations, and temperatures. We find that electrical conductivity and Seebeck coefficient can be enhanced simultaneously in Sb2Te3/Bi2Te3 quantum dot nanocomposites because of the formation of minibands and the phonon-bottleneck effect on carrier-phonon scattering. Our results could shed some light on the design of high-efficiency thermoelectric materials.

Observation of Phonon Bottleneck in Quantum Dot Electronic Relaxation

2001 ◽  
Vol 86 (21) ◽  
pp. 4930-4933 ◽  
Author(s):  
J. Urayama ◽  
T. B. Norris ◽  
J. Singh ◽  
P. Bhattacharya
Keyword(s):  
Quantum Dot ◽  
Electronic Relaxation ◽  
Phonon Bottleneck

Effect of a Phonon Bottleneck on Exciton and Spin Generation in Self-Assembled In1−xGaxAs Quantum Dots

2018 ◽  
Vol 9 (4) ◽  
Author(s):  
Y. Q. Huang ◽  
I. A. Buyanova ◽  
X. J. Yang ◽  
A. Murayama ◽  
W. M. Chen
Keyword(s):  
Quantum Dots ◽  
Phonon Bottleneck ◽  
Self Assembled
Sign in / Sign up

Export Citation Format

Share Document