Chemical Strain Engineering of MAPbI3 Perovskite Films

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YALCINKAYA, Yenal, Ilka M. HERMES, Tobias SEEWALD, Katrin AMANN‐WINKEL, Lothar VEITH, Lukas SCHMIDT-MENDE, Stefan A. L. WEBER, 2022. Chemical Strain Engineering of MAPbI3 Perovskite Films. In: Advanced Energy Materials. Wiley-VCH. ISSN 1614-6832. eISSN 1614-6840. Available under: doi: 10.1002/aenm.202202442

@article{Yalcinkaya2022-08-16Chemi-58381, title={Chemical Strain Engineering of MAPbI3 Perovskite Films}, year={2022}, doi={10.1002/aenm.202202442}, issn={1614-6832}, journal={Advanced Energy Materials}, author={Yalcinkaya, Yenal and Hermes, Ilka M. and Seewald, Tobias and Amann‐Winkel, Katrin and Veith, Lothar and Schmidt-Mende, Lukas and Weber, Stefan A. L.} }

Amann‐Winkel, Katrin Veith, Lothar Yalcinkaya, Yenal Chemical Strain Engineering of MAPbI<sub>3</sub> Perovskite Films Weber, Stefan A. L. Attribution-NonCommercial 4.0 International Seewald, Tobias 2022-08-25T07:25:49Z 2022-08-16 Yalcinkaya, Yenal Weber, Stefan A. L. Hermes, Ilka M. Schmidt-Mende, Lukas eng 2022-08-25T07:25:49Z Veith, Lothar Seewald, Tobias Amann‐Winkel, Katrin Schmidt-Mende, Lukas Hermes, Ilka M. This study introduces a new chemical method for controlling the strain in methylammonium lead iodide (MAPbI<sub>3</sub>) perovskite crystals by varying the ratio of Pb(Ac)<sub>2</sub> and PbCl<sub>2</sub> in the precursor solution. To observe the effect on crystal strain, a combination of piezoresponse force microscopy (PFM) and X-ray diffraction (XRD) is used. The PFM images show an increase in the average size of ferroelastic twin domains upon increasing the PbCl<sub>2</sub> content, indicating an increase in crystal strain. The XRD spectra support this observation with strong crystal twinning features that appear in the spectra. This behavior is caused by a strain gradient during the crystallization due to different evaporation rates of methylammonium acetate and methylammonium chloride as revealed by time-of-flight secondary ion mass spectroscopy and grazing incidince X-ray diffraction measurements. Additional time-resolved photoluminescence shows an increased carrier lifetime in the MAPbI<sub>3</sub> films prepared with higher PbCl<sub>2</sub> content, suggesting a decreased trap density in films with larger twin domain structures. The results demonstrate the potential of chemical strain engineering as a simple method for controlling strain-related effects in lead halide perovskites.

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Attribution-NonCommercial 4.0 International Except where otherwise noted, this item's license is described as Attribution-NonCommercial 4.0 International

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