Direct Tracking of Charge Carrier Drift and Extraction from Perovskite Solar Cells by Means of Transient Electroabsorption Spectroscopy.

Autor: Jašinskas V; Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio av. 3, VilniusLT-10257, Lithuania., Franckevičius M; Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio av. 3, VilniusLT-10257, Lithuania., Gelžinis A; Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio av. 3, VilniusLT-10257, Lithuania.; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 9, VilniusLT-10222, Lithuania., Chmeliov J; Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio av. 3, VilniusLT-10257, Lithuania.; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 9, VilniusLT-10222, Lithuania., Gulbinas V; Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio av. 3, VilniusLT-10257, Lithuania.; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 9, VilniusLT-10222, Lithuania.
Jazyk: angličtina
Zdroj: ACS applied electronic materials [ACS Appl Electron Mater] 2023 Jan 11; Vol. 5 (1), pp. 317-326. Date of Electronic Publication: 2023 Jan 11 (Print Publication: 2023).
DOI: 10.1021/acsaelm.2c01346
Abstrakt: The best perovskite solar cells currently demonstrate more than 25% efficiencies, yet many fundamental processes that determine the operation of these devices are still not fully understood. In particular, even though the device performance strongly depends on charge carrier transport across the perovskite layer to selective electrodes, information about this process is still very controversial. Here, we investigate charge carrier motion and extraction from an archetypical CH 3 NH 3 PbI 3 (MAPI) perovskite solar cell. We use the ultrafast electric-field-modulated transient absorption technique, which allows us to evaluate the electric field dynamics from the time-resolved electroabsorption spectra and to visualize the motion of charge carriers with subpicosecond time resolution. We demonstrate that photogenerated holes drift across the mesoporous TiO 2 /perovskite layer during hundreds of picoseconds. On the other hand, their extraction into the spiro-OMeTAD hole transporting layer lasts for more than 1 nanosecond, suggesting that the hole extraction is limited by the perovskite/spiro-OMeTAD interface rather than by the hole transport through the perovskite layer. Additionally, we use the ultrafast time-resolved fluorescence technique that reveals fluorescence decay during tens of picoseconds, which we attribute to the spatial separation of electrons and holes.
Competing Interests: The authors declare no competing financial interest.
(© 2023 American Chemical Society.)
Databáze: MEDLINE
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