Unveiling the interaction mechanisms of electron and X-ray radiation with halide perovskite semiconductors using scanning nano-probe diffraction

Autor: Ferrer Orri, Jordi, Doherty, Tiarnan A.S., Johnstone, Duncan, Collins, Sean M., Simons, Hugh, Midgley, Paul A., Ducati, Caterina, Stranks, Samuel D.
Přispěvatelé: Ducati, Caterina [0000-0003-3366-6442], Apollo - University of Cambridge Repository, Ferrer Orri, Jordi [0000-0002-0432-5932], Midgley, Paul [0000-0002-6817-458X], Stranks, Samuel [0000-0002-8303-7292]
Rok vydání: 2022
Předmět:
Zdroj: Advanced Materials
Orri, J F, Doherty, T A S, Johnstone, D, Collins, S M, Simons, H, Midgley, P A, Ducati, C & Stranks, S D 2022, ' Unveiling the Interaction Mechanisms of Electron and X-ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction ', Advanced Materials, vol. 34, no. 18, 2200383 . https://doi.org/10.1002/adma.202200383
ISSN: 0935-9648
DOI: 10.17863/cam.82415
Popis: Funder: Engineering and Physical Sciences Research Council; Id: http://dx.doi.org/10.13039/501100000266
Funder: National University of Ireland Travelling Studentship
Funder: European Research Council; Id: http://dx.doi.org/10.13039/501100000781
The interaction of high-energy electrons and X-ray photons with beam-sensitive semiconductors such as halide perovskites is essential for the characterisation and understanding of these optoelectronic materials. Using nano-probe diffraction techniques, which can investigate physical properties on the nanoscale, we perform studies of the interaction of electron and X-ray radiation with state-of-the-art (FA0.79MA0.16Cs0.05)Pb(I0.83Br0.17)3 hybrid halide perovskite films (FA, formamidinium; MA, methylammonium). We track the changes in the local crystal structure as a function of fluence using scanning electron diffraction and synchrotron nano X-ray diffraction techniques. We identify perovskite grains from which additional reflections, corresponding to PbBr2, appear as a crystalline degradation phase after fluences of ~200 e-Å-2. These changes are concomitant with the formation of small PbI2 crystallites at the adjacent high-angle grain boundaries, with the formation of pinholes, and with a phase transition from tetragonal to cubic. A similar degradation pathway is caused by photon irradiation in nano-X-ray diffraction, suggesting common underlying mechanisms. Our approach explores the radiation limits of these materials and provides a description of the degradation pathways on the nanoscale. Addressing high-angle grain boundaries will be critical for the further improvement of halide polycrystalline film stability, especially for applications vulnerable to high-energy radiation such as space photovoltaics.
Databáze: OpenAIRE
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