Suppression of deformation-potential electron–acoustic-phonon coupling in Si δ-doped GaAs structures

1995 ◽  
Vol 52 (19) ◽  
pp. 13738-13741 ◽  
Author(s):  
P. Hawker ◽  
N. Hauser ◽  
G. Li ◽  
C. Jagadish ◽  
M. R. Melloch
Keyword(s):  
Acoustic Phonon ◽  
Deformation Potential ◽  
Phonon Coupling ◽  
Electron Acoustic

scholarly journals Electron–acoustic phonon coupling in single crystal CH3NH3PbI3 perovskites revealed by coherent acoustic phonons

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Pierre-Adrien Mante ◽  
Constantinos C. Stoumpos ◽  
Mercouri G. Kanatzidis ◽  
Arkady Yartsev
Keyword(s):  
Single Crystal ◽  
Acoustic Phonon ◽  
Phonon Coupling ◽  
Acoustic Phonons ◽  
Electron Acoustic ◽  
Coherent Acoustic Phonons

scholarly journals Acoustic phonon lifetimes limit thermal transport in methylammonium lead iodide

2018 ◽  
Vol 115 (47) ◽  
pp. 11905-11910 ◽  
Author(s):  
Aryeh Gold-Parker ◽  
Peter M. Gehring ◽  
Jonathan M. Skelton ◽  
Ian C. Smith ◽  
Dan Parshall ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Acoustic Phonon ◽  
Optoelectronic Devices ◽  
High Energy ◽  
High Energy Resolution ◽  
Phonon Coupling ◽  
Lead Iodide ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Methylammonium Lead Iodide

Hybrid organic–inorganic perovskites (HOIPs) have become an important class of semiconductors for solar cells and other optoelectronic applications. Electron–phonon coupling plays a critical role in all optoelectronic devices, and although the lattice dynamics and phonon frequencies of HOIPs have been well studied, little attention has been given to phonon lifetimes. We report high-precision momentum-resolved measurements of acoustic phonon lifetimes in the hybrid perovskite methylammonium lead iodide (MAPI), using inelastic neutron spectroscopy to provide high-energy resolution and fully deuterated single crystals to reduce incoherent scattering from hydrogen. Our measurements reveal extremely short lifetimes on the order of picoseconds, corresponding to nanometer mean free paths and demonstrating that acoustic phonons are unable to dissipate heat efficiently. Lattice-dynamics calculations using ab initio third-order perturbation theory indicate that the short lifetimes stem from strong three-phonon interactions and a high density of low-energy optical phonon modes related to the degrees of freedom of the organic cation. Such short lifetimes have significant implications for electron–phonon coupling in MAPI and other HOIPs, with direct impacts on optoelectronic devices both in the cooling of hot carriers and in the transport and recombination of band edge carriers. These findings illustrate a fundamental difference between HOIPs and conventional photovoltaic semiconductors and demonstrate the importance of understanding lattice dynamics in the effort to develop metal halide perovskite optoelectronic devices.

Sign in / Sign up

Export Citation Format

Share Document