Unraveling charge carriers generation, diffusion, and recombination in formamidinium lead triiodide perovskite polycrystalline thin filmShow others and affiliations
2016 (English)In: The Journal of Physical Chemistry Letters, E-ISSN 1948-7185, Vol. 7, p. 204-210Article in journal (Refereed) Published
Abstract [en]
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 cm2 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 cm2 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.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 7, p. 204-210
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Identifiers
URN: urn:nbn:se:liu:diva-175369DOI: 10.1021/acs.jpclett.5b02648ISI: 000367968700035Scopus ID: 2-s2.0-84954062094OAI: oai:DiVA.org:liu-175369DiVA, id: diva2:1548155
2021-04-292021-04-292024-07-04Bibliographically approved