Hyperspectral nanoscale mapping of hybrid perovskite photophysics at the single grain level

Taylor, Ethan J.; Iyer, Vasudevan; Dhami, Bibek S.; Klein, Clay; Lawrie, Benjamin J.; Appavoo, Kannatassen

doi:10.48550/arxiv.2201.06546

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2023

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Cited by 2 publications

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“…Cathodoluminescence microscopies have become increasingly critical tools for probing beam-sensitive 2D materials 33,34 and perovskite films. 35,36 The ability to probe nanoscale excited state dynamics in these materials without direct electron-beam excitation will enable new CL imaging modalities that would otherwise introduce unmanageable beam-induced damage due to excessive dwell times.…”

Section: Discussionmentioning

confidence: 99%

Photon bunching in cathodoluminescence induced by indirect electron excitation

Iyer

Roccapriore

et al. 2023

Nanoscale

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Section: Discussionmentioning

confidence: 99%

Photon bunching in cathodoluminescence induced by indirect electron excitation

Iyer

Roccapriore

et al. 2023

Nanoscale

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Exploring the Relationship of Microstructure and Conductivity in Metal Halide Perovskites via Active Learning-Driven Automated Scanning Probe Microscopy

Liu

Yang

Vasudevan

et al. 2023

J. Phys. Chem. Lett.

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Electronic transport and hysteresis in metal halide perovskites (MHPs) are key to the applications in photovoltaics, light emitting devices, and light and chemical sensors. These phenomena are strongly affected by the materials microstructure including grain boundaries, ferroic domain walls, and secondary phase inclusions. Here, we demonstrate an active machine learning framework for “driving” an automated scanning probe microscope (SPM) to discover the microstructures responsible for specific aspects of transport behavior in MHPs. In our setup, the microscope can discover the microstructural elements that maximize the onset of conduction, hysteresis, or any other characteristic that can be derived from a set of current–voltage spectra. This approach opens new opportunities for exploring the origins of materials functionality in complex materials by SPM and can be integrated with other characterization techniques either before (prior knowledge) or after (identification of locations of interest for detail studies) functional probing.

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Hyperspectral nanoscale mapping of hybrid perovskite photophysics at the single grain level

Cited by 2 publications

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Photon bunching in cathodoluminescence induced by indirect electron excitation

Photon bunching in cathodoluminescence induced by indirect electron excitation

Exploring the Relationship of Microstructure and Conductivity in Metal Halide Perovskites via Active Learning-Driven Automated Scanning Probe Microscopy

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