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Organometal Halide Perovskite Solar Cell Materials Rationalized: Ultrafast Charge Generation, High and Microsecond-Long Balanced Mobilities, and Slow Recombination

Ponseca, Carlito LU ; Savenije, Tom J.; Qenawy, Mohamed LU ; Zheng, Kaibo LU ; Yartsev, Arkady LU ; Pascher, Tobjorn; Harlang, Tobias LU ; Chabera, Pavel LU ; Pullerits, Tönu LU and Stepanov, Andrey, et al. (2014) In Journal of the American Chemical Society 136(14). p.5189-5192
Abstract
Organometal halide perovskite-based solar cells have recently been reported to be highly efficient, giving an overall power conversion efficiency of up to 15%. However, much of the fundamental photophysical properties underlying this performance has remained unknown. Here, we apply photoluminescence, transient absorption, time-resolved terahertz and microwave conductivity measurements to determine the time scales of generation and recombination of charge carriers as well as their transport properties in solution-processed CH3NH3PbI3 perovskite materials. We found that electron-hole pairs are generated almost instantaneously after photoexcitation and dissociate in 2 ps forming highly mobile charges (25 cm(2) V-1 s(-1)) in the neat... (More)
Organometal halide perovskite-based solar cells have recently been reported to be highly efficient, giving an overall power conversion efficiency of up to 15%. However, much of the fundamental photophysical properties underlying this performance has remained unknown. Here, we apply photoluminescence, transient absorption, time-resolved terahertz and microwave conductivity measurements to determine the time scales of generation and recombination of charge carriers as well as their transport properties in solution-processed CH3NH3PbI3 perovskite materials. We found that electron-hole pairs are generated almost instantaneously after photoexcitation and dissociate in 2 ps forming highly mobile charges (25 cm(2) V-1 s(-1)) in the neat perovskite and in perovskite/alumina blends; almost balanced electron and hole mobilities remain very high up to the microsecond time scale. When the perovskite is introduced into a TiO2 mesoporous structure, electron injection from perovskite to the metal oxide is efficient in less than a picosecond, but the lower intrinsic electron mobility of TiO2 leads to unbalanced charge transport. Microwave conductivity measurements showed that the decay of mobile charges is very slow in CH3NH3PbI3, lasting up to tens of microseconds. These results unravel the remarkable intrinsic properties of CH3NH3PbI3 perovskite material if used as light absorber and charge transport layer. Moreover, finding a metal oxide with higher electron mobility may further increase the performance of this class of solar cells. (Less)
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published
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in
Journal of the American Chemical Society
volume
136
issue
14
pages
5189 - 5192
publisher
The American Chemical Society
external identifiers
  • wos:000334572200003
  • scopus:84898007099
ISSN
1520-5126
DOI
10.1021/ja412583t
language
English
LU publication?
yes
id
ae6ffdeb-f124-448c-b278-55a56b291cdc (old id 4488718)
date added to LUP
2014-06-23 13:48:51
date last changed
2017-11-12 03:39:36
@article{ae6ffdeb-f124-448c-b278-55a56b291cdc,
  abstract     = {Organometal halide perovskite-based solar cells have recently been reported to be highly efficient, giving an overall power conversion efficiency of up to 15%. However, much of the fundamental photophysical properties underlying this performance has remained unknown. Here, we apply photoluminescence, transient absorption, time-resolved terahertz and microwave conductivity measurements to determine the time scales of generation and recombination of charge carriers as well as their transport properties in solution-processed CH3NH3PbI3 perovskite materials. We found that electron-hole pairs are generated almost instantaneously after photoexcitation and dissociate in 2 ps forming highly mobile charges (25 cm(2) V-1 s(-1)) in the neat perovskite and in perovskite/alumina blends; almost balanced electron and hole mobilities remain very high up to the microsecond time scale. When the perovskite is introduced into a TiO2 mesoporous structure, electron injection from perovskite to the metal oxide is efficient in less than a picosecond, but the lower intrinsic electron mobility of TiO2 leads to unbalanced charge transport. Microwave conductivity measurements showed that the decay of mobile charges is very slow in CH3NH3PbI3, lasting up to tens of microseconds. These results unravel the remarkable intrinsic properties of CH3NH3PbI3 perovskite material if used as light absorber and charge transport layer. Moreover, finding a metal oxide with higher electron mobility may further increase the performance of this class of solar cells.},
  author       = {Ponseca, Carlito and Savenije, Tom J. and Qenawy, Mohamed and Zheng, Kaibo and Yartsev, Arkady and Pascher, Tobjorn and Harlang, Tobias and Chabera, Pavel and Pullerits, Tönu and Stepanov, Andrey and Wolf, Jean-Pierre and Sundström, Villy},
  issn         = {1520-5126},
  language     = {eng},
  number       = {14},
  pages        = {5189--5192},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {Organometal Halide Perovskite Solar Cell Materials Rationalized: Ultrafast Charge Generation, High and Microsecond-Long Balanced Mobilities, and Slow Recombination},
  url          = {http://dx.doi.org/10.1021/ja412583t},
  volume       = {136},
  year         = {2014},
}