Print Email Facebook Twitter Temperature-Dependent Interplay between Structural and Charge Carrier Dynamics in CsMAFA-Based Perovskites Title Temperature-Dependent Interplay between Structural and Charge Carrier Dynamics in CsMAFA-Based Perovskites Author Zhao, J. (TU Delft ChemE/Opto-electronic Materials) Liu, X. (TU Delft ChemE/O&O groep) Wu, Zijin (Eindhoven University of Technology) Ibrahim, B. (TU Delft ChemE/O&O groep) Thieme, J. (TU Delft ChemE/O&O groep) Brocks, Geert (Eindhoven University of Technology; University of Twente) Tao, Shuxia (Eindhoven University of Technology) Bannenberg, L.J. (TU Delft RID/TS/Instrumenten groep) Savenije, T.J. (TU Delft ChemE/Opto-electronic Materials) Date 2023 Abstract State-of-the-art triple cation, mixed halide perovskites are extensively studied in perovskite solar cells, showing very promising performance and stability. However, an in-depth fundamental understanding of how the phase behavior in Cs0.05FA0.85MA0.10Pb(I0.97Br0.03)3 (CsMAFA) affects the optoelectronic properties is still lacking. The refined unit cell parameters a and c in combination with the thermal expansion coefficients derived from X-ray diffraction patterns reveal that CsMAFA undergoes an α–β phase transition at ≈280 K and another transition to the γ-phase at ≈180 K. From the analyses of the electrodeless microwave photoconductivity measurements it is shown that shallow traps only in the γ-phase negatively affect the charge carrier dynamics. Most importantly, CsMAFA exhibits the lowest amount of microstrain in the β-phase at around 240 K, corresponding to the lowest amount of trap density, which translates into the longest charge carrier diffusion length for electrons and holes. Below 200 K a considerable increase in deep trap states is found most likely related to the temperature-induced compressive microstrain leading to a huge imbalance in charge carrier diffusion lengths between electrons and holes. This work provides valuable insight into how temperature-dependent changes in structure affect the charge carrier dynamics in FA-rich perovskites. Subject charge carrier dynamicsmetal halide perovskitesmicrostrainphase structureshallow trap statestime-resolved microwave conductivity To reference this document use: http://resolver.tudelft.nl/uuid:8775cff7-5db3-43b4-ba04-f7b25e13bdd7 DOI https://doi.org/10.1002/adfm.202311727 ISSN 1616-301X Source Advanced Functional Materials Part of collection Institutional Repository Document type journal article Rights © 2023 J. Zhao, X. Liu, Zijin Wu, B. Ibrahim, J. Thieme, Geert Brocks, Shuxia Tao, L.J. Bannenberg, T.J. Savenije Files PDF Adv_Funct_Materials_2023_ ... ics_in.pdf 2.09 MB Close viewer /islandora/object/uuid:8775cff7-5db3-43b4-ba04-f7b25e13bdd7/datastream/OBJ/view