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

Mante, Pierre-adrien LU ; Stoumpos, Constantinos C.; Kanatzidis, Mercouri G. and Yartsev, Arkady LU (2017) In Nature Communications 8.
Abstract
Despite the great amount of attention CH3NH3PbI3 has received for its solar cell application, intrinsic properties of this material are still largely unknown. Mobility of charges is a quintessential property in this aspect; however, there is still no clear understanding of electron transport, as reported values span over three orders of magnitude. Here we develop a method to measure the electron and hole deformation potentials using coherent acoustic phonons generated by femtosecond laser pulses. We apply this method to characterize a CH3NH3PbI3 single crystal. We measure the acoustic phonon properties and characterize electron-acoustic phonon scattering. Then, using the deformation potential theory, we calculate the carrier intrinsic... (More)
Despite the great amount of attention CH3NH3PbI3 has received for its solar cell application, intrinsic properties of this material are still largely unknown. Mobility of charges is a quintessential property in this aspect; however, there is still no clear understanding of electron transport, as reported values span over three orders of magnitude. Here we develop a method to measure the electron and hole deformation potentials using coherent acoustic phonons generated by femtosecond laser pulses. We apply this method to characterize a CH3NH3PbI3 single crystal. We measure the acoustic phonon properties and characterize electron-acoustic phonon scattering. Then, using the deformation potential theory, we calculate the carrier intrinsic mobility and compare it to the reported experimental and theoretical values. Our results reveal high electron and hole mobilities of 2,800 and 9,400 cm2 V−1 s−1, respectively. Comparison with literature values of mobility demonstrates the potential role played by polarons in charge transport in CH3NH3PbI3. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
8
publisher
Nature Publishing Group
external identifiers
  • scopus:85011994918
  • wos:000393458000001
ISSN
2041-1723
DOI
10.1038/ncomms14398
language
English
LU publication?
yes
id
7649d0f6-a3c7-455a-8e77-a2ca2e3cda53
date added to LUP
2017-02-08 13:19:53
date last changed
2018-08-12 04:33:31
@article{7649d0f6-a3c7-455a-8e77-a2ca2e3cda53,
  abstract     = {Despite the great amount of attention CH3NH3PbI3 has received for its solar cell application, intrinsic properties of this material are still largely unknown. Mobility of charges is a quintessential property in this aspect; however, there is still no clear understanding of electron transport, as reported values span over three orders of magnitude. Here we develop a method to measure the electron and hole deformation potentials using coherent acoustic phonons generated by femtosecond laser pulses. We apply this method to characterize a CH3NH3PbI3 single crystal. We measure the acoustic phonon properties and characterize electron-acoustic phonon scattering. Then, using the deformation potential theory, we calculate the carrier intrinsic mobility and compare it to the reported experimental and theoretical values. Our results reveal high electron and hole mobilities of 2,800 and 9,400 cm2 V−1 s−1, respectively. Comparison with literature values of mobility demonstrates the potential role played by polarons in charge transport in CH3NH3PbI3.},
  articleno    = {14398},
  author       = {Mante, Pierre-adrien and Stoumpos, Constantinos C. and Kanatzidis, Mercouri G. and Yartsev, Arkady},
  issn         = {2041-1723},
  language     = {eng},
  month        = {02},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Electron–acoustic phonon coupling in single crystal CH3NH3PbI3 perovskites revealed by coherent acoustic phonons},
  url          = {http://dx.doi.org/10.1038/ncomms14398},
  volume       = {8},
  year         = {2017},
}