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Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode.

Corani, Alice LU ; Li, Ming-Hsien; Shen, Po-Shen; Chen, Peter; Guo, Tzung-Fang; El Nahhas, Amal LU ; Zheng, Kaibo LU ; Yartsev, Arkady LU ; Sundström, Villy LU and Ponseca, Carlito LU (2016) In The Journal of Physical Chemistry Letters 7. p.1096-1101
Abstract
There is a mounting effort to use nickel oxide (NiO) as p-type selective electrode for organometal halide perovskite-based solar cells. Recently, an overall power conversion efficiency using this hole acceptor has reached 18%. However, ultrafast spectroscopic investigations on the mechanism of charge injection as well as recombination dynamics have yet to be studied and understood. Using time-resolved terahertz spectroscopy, we show that hole transfer is complete on the subpicosecond time scale, driven by the favorable band alignment between the valence bands of perovskite and NiO nanoparticles (NiO(np)). Recombination time between holes injected into NiO(np) and mobile electrons in the perovskite material is shown to be hundreds of... (More)
There is a mounting effort to use nickel oxide (NiO) as p-type selective electrode for organometal halide perovskite-based solar cells. Recently, an overall power conversion efficiency using this hole acceptor has reached 18%. However, ultrafast spectroscopic investigations on the mechanism of charge injection as well as recombination dynamics have yet to be studied and understood. Using time-resolved terahertz spectroscopy, we show that hole transfer is complete on the subpicosecond time scale, driven by the favorable band alignment between the valence bands of perovskite and NiO nanoparticles (NiO(np)). Recombination time between holes injected into NiO(np) and mobile electrons in the perovskite material is shown to be hundreds of picoseconds to a few nanoseconds. Because of the low conductivity of NiO(np), holes are pinned at the interface, and it is electrons that determine the recombination rate. This recombination competes with charge collection and therefore must be minimized. Doping NiO to promote higher mobility of holes is desirable in order to prevent back recombination. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
7
pages
1096 - 1101
publisher
The American Chemical Society
external identifiers
  • pmid:26942559
  • wos:000373867600002
  • scopus:84964562889
ISSN
1948-7185
DOI
10.1021/acs.jpclett.6b00238
language
English
LU publication?
yes
id
c8fda924-cd4b-4c4f-9952-624440afac6e (old id 8856224)
date added to LUP
2016-03-21 10:04:38
date last changed
2017-11-19 03:45:31
@article{c8fda924-cd4b-4c4f-9952-624440afac6e,
  abstract     = {There is a mounting effort to use nickel oxide (NiO) as p-type selective electrode for organometal halide perovskite-based solar cells. Recently, an overall power conversion efficiency using this hole acceptor has reached 18%. However, ultrafast spectroscopic investigations on the mechanism of charge injection as well as recombination dynamics have yet to be studied and understood. Using time-resolved terahertz spectroscopy, we show that hole transfer is complete on the subpicosecond time scale, driven by the favorable band alignment between the valence bands of perovskite and NiO nanoparticles (NiO(np)). Recombination time between holes injected into NiO(np) and mobile electrons in the perovskite material is shown to be hundreds of picoseconds to a few nanoseconds. Because of the low conductivity of NiO(np), holes are pinned at the interface, and it is electrons that determine the recombination rate. This recombination competes with charge collection and therefore must be minimized. Doping NiO to promote higher mobility of holes is desirable in order to prevent back recombination.},
  author       = {Corani, Alice and Li, Ming-Hsien and Shen, Po-Shen and Chen, Peter and Guo, Tzung-Fang and El Nahhas, Amal and Zheng, Kaibo and Yartsev, Arkady and Sundström, Villy and Ponseca, Carlito},
  issn         = {1948-7185},
  language     = {eng},
  pages        = {1096--1101},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode.},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.6b00238},
  volume       = {7},
  year         = {2016},
}