Project description
Probing how non-periodic lattice dynamics affect semiconductor properties
Metal-halide perovskites – a subset of hybrid organic–inorganic perovskites containing halide ions – are known for their unprecedented potential to convert sunlight into electricity. Researchers working on the EU-funded ANHARMONIC project deem that what sets metal-halide perovskites apart from conventional semiconductors and gives rise to special properties that make them behave more like liquids than crystalline solids is linked to strongly anharmonic lattice dynamics. Guided by the recent studies on halide perovskites, the project aims to generalise our understanding of the relationship between lattice anharmonicity and the electronic properties of semiconductors. Project outcomes could help establish a novel scheme for designing semiconductors with desirable properties.
Objective
Recent studies of halide perovskite semiconductors (SCs) showed that they exhibit a unique combination of very-low defect density, self-healing properties and low exciton binding energies that result in excellent photovoltaic activity.
I hypothezise that the fundamental property that sets the halide perovskites apart from conventional SCs and gives rise to their beneficial properties is strongly anharmonic lattice dynamics.
Large amplitude, local polar fluctuations that result from lattice anharmonicity localize the electronic states and enhance the screening of electric charges within the material.
In other words, in some aspects, halide perovskites behave more like a liquid than a crystalline solid.
Stimulated by the recent discoveries on halide perovskites, I aim to generalize our understanding of the relationship between lattice anharmonicity and the electronic properties of SCs.
The potential outcome of this investigation will be a novel scheme to design SCs with desirable properties where lattice anharmonicity is used as a new material-engineering tool.
My strategy is to perform comparative studies in both inorganic ionic crystals and small-molecule organic crystals.
We will use low-frequency Raman spectroscopy to quantify anharmonic lattice dynamics and compare between different crystals to identify the factors that induce anharmonicity in solids.
Photoluminescence, reflectance, time-resolved terahertz and impedance spectroscopies will be used to probe the SCs optical properties, carrier mobilities and lifetimes, and their dielectric response. I expect to find that as anharmonicity increases, the dielectric response and carrier lifetimes increase while carrier mobility decreases.
Finally, we will develop a modulated Raman spectroscopic methodology that will identify specific lattice motions that are coupled to band-edge carriers, thus elucidating the microscopic mechanism of carrier-lattice interactions.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
ERC-STG - Starting Grant
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Call for proposal
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(opens in new window) ERC-2019-STG
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7610001 Rehovot
Israel
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