Local Nanoscale Defective Phase Impurities Are the Sites of Degradation in Halide Perovskite Devices

Macpherson, Stuart; Doherty, Tiarnan A. S.; Winchester, Andrew; Kosar, Sofiia; Johnstone, Duncan N.; Chiang, Yu‐Hsien; Galkowski, Krzystof; Anaya, Miguel; Frohna, Kyle; Iqbal, Affan N.; Roose, Bart; Andaji‐Garmaroudi, Zahra; Midgley, Paul A.; Dani, Keshav M.; Stranks, Samuel D.

doi:10.48550/arxiv.2107.09549

Cited by 2 publications

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“…Such changes are proposed to be seeded from crystallographic and compositional impurities. [46] Light soaking can also trigger Cs segregation, [52] which is not observed in the nXRF mapping during high-energy X-ray exposure in this report (see Figure S17, Supporting Information). The use of high-energy beams results in faster degradation pathways of perovskites from the pristine state, compared to early-stage degradation from impurities caused by lower-fluence visible light irradiation.…”

Section: Resultsmentioning

confidence: 66%

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Unveiling the Interaction Mechanisms of Electron and X‐ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction

et al. 2022

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The interaction of high‐energy electrons and X‐ray photons with beam‐sensitive semiconductors such as halide perovskites is essential for the characterization and understanding of these optoelectronic materials. Using nanoprobe diffraction techniques, which can investigate physical properties on the nanoscale, 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) are performed, tracking the changes in the local crystal structure as a function of fluence using scanning electron diffraction and synchrotron nano X‐ray diffraction techniques. Perovskite grains are identified, 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. This 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.

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Section: Resultsmentioning

confidence: 66%

“…Although these additional reflections, already visible in the first frame, are difficult to index, they suggest the presence of defects. [46] These defective high-angle boundaries can trigger faster degradation and larger morphological variations than less defective boundaries (region 1).…”

Section: Resultsmentioning

confidence: 99%

Unveiling the Interaction Mechanisms of Electron and X‐ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction

et al. 2022

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“…Metal halide perovskites have shown exceptional performance in optoelectronic devices, including tandem photovoltaics [1,2] and LEDs [3]. However, their impressive performance is surprising given that they exhibit several forms of heterogeneity, namely spatially varying deep charge carrier trap densities [4], structural heterogeneity in the form of multiple phase inclusions and impurities [5,6], as well as considerable chemical heterogeneity [7,8]. All these variations are considered to be negative in conventional semiconductors and so halide perovskites high performance in spite of these has meant they have been referred to as 'defect tolerant'.…”

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confidence: 99%

Multimodal Correlative Microscopy to Study the Chemical and Energetic Landscape of Alloyed Halide Perovskites

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Anaya

Macpherson

et al. 2022

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Local Nanoscale Defective Phase Impurities Are the Sites of Degradation in Halide Perovskite Devices

Cited by 2 publications

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Unveiling the Interaction Mechanisms of Electron and X‐ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction

Unveiling the Interaction Mechanisms of Electron and X‐ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction

Multimodal Correlative Microscopy to Study the Chemical and Energetic Landscape of Alloyed Halide Perovskites

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