What happens when we bend MAPbI3 films? Insights on sub-grain structures and stability

Rhys Kennard^a, Clayton Dahlman^a, Ryan DeCrescent^d, Jon Schuller^c, Kunal Mukherjee^a, Ram Seshadri^a^,^b, Michael Chabinyc^a

^aMaterials Department, University of California, Santa Barbara, United States

^bDepartment of Chemistry, University of California Santa Barbara

^cDepartment of Electrical and Computer Engineering, University of California, Santa Barbara

^dDepartment of Physics, University of California, Santa Barbara

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)

Online, Spain, 2021 May 24th - 28th

Organizers: Marina Freitag, Feng Gao and Sam Stranks

Oral, Rhys Kennard, presentation 038
Publication date: 11th May 2021

Hybrid perovskites are being commercialized using roll-to-roll processing and are attractive for flexible optoelectronics. This raises questions about what happens to the film structure and stability after bending. Here, we examine the consequences of bending on the sub-grain structure of MAPbI₃,the prototypical perovskite. MAPbI₃ is a ferroelastic, which means that it forms sub-grain domains with identical crystal structure and different crystallographic orientation. Repeated bending causes changes to the proportions of these sub-grain domains, and the applied strains required for these changes are mapped on the stress-strain curve. The effects of thermal stress from the substrate are also decoupled. Bending the films outwards caused faster degradation; this is correlated with nucleation of new sub-grain domains causing a greater amount of defects. The impacts for ion migration, carrier trapping, and degradation are also discussed, as well as how these behaviors might be differently impacted in single crystals and thin films. [1]

References:

[1] Kennard, R. M., Dahlman, C. J., DeCrescent, R. A., Schuller, J. A., Mukherjee, K., Seshadri, R., & Chabinyc, M. L. Ferroelastic Hysteresis in Thin Films of Methylammonium Lead Iodide. Chemistry of Materials, 2021, 33, 1, 298–309.

Acknowledgements:

Growth and structural characterization were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award Number DE-SC-0012541. Support of optical characterization was provided by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award Number DE-SC0019273. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The research reported here also made use the shared facilities of the UCSB MRSEC (National Science Foundation DMR 1720256), a member of the Materials Research Facilities Network (www.mrfn.org). R.M.K. gratefully acknowledges the National Defense Science and Engineering Graduate fellowship for financial support. The authors would like to thank Prof. Anton Van der Ven for advice on ferroelasticity.

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