期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 7, 期 1, 页码 204-210出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b02648
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资金
- MINECO
- JCCM (Spain) [MAT2011-25472, MAT2014-57646-P, PEII-2014-003-P]
- Swedish Energy Agency (STEM)
- Swedish Research Council
- Knut & Alice Wallenberg Foundation
- European Research Council [226136-VISCHEM]
- Nanometer Consortium at Lund University
- Lund Laser Center
- Quantcells project from CDTI
We report on studies of the formamidinium lead triiodide (FAPbI(3)) 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 (similar to 75 cm(2) V-1 s(-1)) remains constant at least up to 8 ns, which corresponds to a diffusion length of 25 mu m. 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.
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