Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film.

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Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film. / Piatkowski, Piotr; Cohen, Boiko; Ponseca, Carlito; Salado, Manuel; Kazim, Samrana; Ahmad, Shahzada; Sundström, Villy; Douhal, Abderrazzak.

I: The Journal of Physical Chemistry Letters, Vol. 7, Nr. 1, 2016, s. 204-210.

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Piatkowski, Piotr ; Cohen, Boiko ; Ponseca, Carlito ; Salado, Manuel ; Kazim, Samrana ; Ahmad, Shahzada ; Sundström, Villy ; Douhal, Abderrazzak. / Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film. I: The Journal of Physical Chemistry Letters. 2016 ; Vol. 7, Nr. 1. s. 204-210.

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TY - JOUR

T1 - Unraveling Charge Carriers Generation, Diffusion, and Recombination in Formamidinium Lead Triiodide Perovskite Polycrystalline Thin Film.

AU - Piatkowski, Piotr

AU - Cohen, Boiko

AU - Ponseca, Carlito

AU - Salado, Manuel

AU - Kazim, Samrana

AU - Ahmad, Shahzada

AU - Sundström, Villy

AU - Douhal, Abderrazzak

PY - 2016

Y1 - 2016

N2 - We report on studies of the formamidinium lead triiodide (FAPbI3) perovskite film using time-resolved terahertz (THz) spectroscopy (TRTS) and flash photolysis to explore charge carriers generation, migration, and recombination. The TRTS results show that upon femtosecond excitation above the absorption edge, the initial high photoconductivity (∼75 cm(2) V(-1) s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 μm. Pumping below the absorption edge results in a mobility of 40 cm(2) V(-1) s(-1) suggesting lower mobility of charge carriers located at the bottom of the conduction band or shallow sub-bandgap states. Furthermore, analysis of the THz kinetics reveals rising components of <1 and 20 ps, reflecting dissociation of excitons having different binding energies. Flash photolysis experiments indicate that trapped charge carriers persist for milliseconds.

AB - We report on studies of the formamidinium lead triiodide (FAPbI3) perovskite film using time-resolved terahertz (THz) spectroscopy (TRTS) and flash photolysis to explore charge carriers generation, migration, and recombination. The TRTS results show that upon femtosecond excitation above the absorption edge, the initial high photoconductivity (∼75 cm(2) V(-1) s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 μm. Pumping below the absorption edge results in a mobility of 40 cm(2) V(-1) s(-1) suggesting lower mobility of charge carriers located at the bottom of the conduction band or shallow sub-bandgap states. Furthermore, analysis of the THz kinetics reveals rising components of <1 and 20 ps, reflecting dissociation of excitons having different binding energies. Flash photolysis experiments indicate that trapped charge carriers persist for milliseconds.

U2 - 10.1021/acs.jpclett.5b02648

DO - 10.1021/acs.jpclett.5b02648

M3 - Article

C2 - 26703885

VL - 7

SP - 204

EP - 210

JO - The Journal of Physical Chemistry Letters

JF - The Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 1

ER -