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Corani A, Li MH, Shen PS, et al. Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode. J Phys Chem Lett. 2016;7(7):1096-101doi: 10.1021/acs.jpclett.6b00238.
Corani, A., Li, M. H., Shen, P. S., Chen, P., Guo, T. F., El Nahhas, A., Zheng, K., Yartsev, A., Sundström, V., & Ponseca, C. S. (2016). Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode. The journal of physical chemistry letters, 7(7), 1096-101. https://doi.org/10.1021/acs.jpclett.6b00238
Corani, Alice, et al. "Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode." The journal of physical chemistry letters vol. 7,7 (2016): 1096-101. doi: https://doi.org/10.1021/acs.jpclett.6b00238
Corani A, Li MH, Shen PS, Chen P, Guo TF, El Nahhas A, Zheng K, Yartsev A, Sundström V, Ponseca CS. Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode. J Phys Chem Lett. 2016 Apr 07;7(7):1096-101. doi: 10.1021/acs.jpclett.6b00238. Epub 2016 Mar 09. PMID: 26942559.
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J Phys Chem Lett. 2016 Apr 07;7(7):1096-101. doi: 10.1021/acs.jpclett.6b00238. Epub 2016 Mar 09.

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

The journal of physical chemistry letters

Alice Corani, Ming-Hsien Li, Po-Shen Shen, Peter Chen, Tzung-Fang Guo, Amal El Nahhas, Kaibo Zheng, Arkady Yartsev, Villy Sundström, Carlito S Ponseca

Affiliations

  1. Division of Chemical Physics, Lund University , Box 124, 221 00 Lund, Sweden.
  2. Department of Photonics, National Cheng Kung University , Tainan, Taiwan 701.
  3. Research Center for Energy Technology and Strategy (RCETS), Tainan, Taiwan 701.
  4. Advanced Optoelectronic Technology Center (AOTC), Tainan, Taiwan 701.

PMID: 26942559 DOI: 10.1021/acs.jpclett.6b00238

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.

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