Joanne Etheridge

Engineering Energy Harvesting Pathways in Mn‐Yb‐Doped Perovskite Nanocrystals

Manoj Sharma, Chang Cao, Pria Ramkissoon, H S Li et autres

ABSTRACT Transition‐metal‐ and lanthanide‐doped perovskite nanocrystals (NCs) exhibit efficient dopant‐induced emission across the visible and near‐infrared spectrum. Here, we investigate Mn and Yb codoping in CsPbX 3 (X = Cl, Br) NCs as a means to control both the forward energy transfer …

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Determining Electron Beam Lateral Coherence in a Scanning Electron Microscope Using Electron Diffraction

Evelijn Akerboom, Fatemeh Kiani, Giulia Tagliabue, Wiebke Albrecht et autres

We develop and characterize scanning transmission electron microscopy (STEM) capabilities within a scanning electron microscope (SEM) to investigate the effective lateral coherence of the electron beam (e-beam) in the specimen plane. Using single-crystalline Au flakes and a sample composed of a monolayer …

Atomic Structure of Grain Boundaries, Dislocations and Associated Strain in Templated Co-evaporated Photoactive Halide Perovskites

Huyen T Pham, Siyu Yan, Zhou Xu, Weilun Li et autres

Structural defects, particularly grain boundaries, play a crucial role in governing charge transport and the optoelectronic properties of metal halide perovskites, thereby limiting the performance of devices. Solar cells incorporating templated FA0.9Cs0.1PbI3-xClx show significant improvements in grain orientation and steady-state power conversion …

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, YUFAN SHEN, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

Fluorite ferroelectrics are exciting candidates for next-generation non-volatile memory devices because their unique ferroelectric mechanism, which arises from unconventional oxygen displacements, permits ferroelectricity with minimal thickness constraints. However, the polarisation switching mechanism remains the subject of intense debate due to a limited …

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Improving amplified spontaneous emission in vacuum-deposited CsPbBr3 thin films from microstructural optimisation

Qimu Yuan, Weilun Li, Ford M. Wagner, Vincent J.‐Y. Lim et autres

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

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Discovery of Ferroelectric Twin Boundaries in a Photoactive Halide Perovskite

Weilun Li, Qimu Yuan, Michael B. Johnston, Joanne Etheridge

Halide perovskites have emerged as promising materials for next-generation photovoltaics, laser sources and X-ray detectors. There is intense debate as to whether some photoactive halide perovskites exhibit ferroelectric behaviour and whether it might be possible to utilise the bulk photovoltaic effect to …

Locating the atoms at the hard-soft interface of gold nanoparticles

Weilun Li, Bryan David Esser, Wenming Tong, Zifei Chen et autres

Surface structure affects the growth, shape and properties of nanoparticles. In wet chemical syntheses, metal additives and surfactants are used to modify surfaces and guide nanocrystal growth. To understand this process, it is critical to understand how the surface structure, and hence …

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Beware Phantom Phases! Guidelines for Identifying the Structure of Buried Precipitates

LAURE N. BOURGEOIS, Weilun Li, Zezhong Zhang, Philip N. H. Nakashima et autres

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Mapping vacancy and bonding electron distributions around aluminium nanovoids

Philip N. H. Nakashima, Yu‐Tsun Shao, Zezhong Zhang, Andrew E. Smith et autres

All materials have defects and many contain nanostructures, both of which disrupt chemical bonding - the basis of materials properties. No experimental measurements of bonding electron distributions associated with defects and nanostructures have ever been possible. We present a method enabling such …