Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The bulk photovoltaic effect (BPVE) has attracted rapidly increasing attention over the past five years, due to its potential to offer efficiency above the Shockley-Queisser limit, to provide photostable absorbers and charge separators, and to simplify solar cell design. Recent breakthroughs have involved the experimental demonstration of high efficiency power conversion from double perovskites and from ferroelectric nanomaterials.
In this talk I will report on some of our latest findings in the areas of computational materials design of ferroelectric photovoltaics and in the understanding of the optical repsonse behavior.
I will describe the importance of nanolayering--the formation of ordered oxide alloy structures, for example via pulsed-laser deposition or molecular beam epitaxy. In many cases, the photovoltaic response of a ferroelectric is not directly proportional to the polarization, and in fact, polarization reduction can lead to photovoltaic enhancement. We predict that a novel PbTiO3-PbNiO2 heterostructure provides an accessible example of enhanced BPVE.
Next, I will present a family of LiNbO3 structure materials that have been made in bulk experimentally and that we predict to show high shift current. In fact, their band structure agrees well with an analytic model, permitting deep understanding of the origin of the photovoltaic current.
Finally, I will discuss how semiconducting ferroelectrics intersect with other important themes in modern physical science. I will report on strong optical dielectric enhancement in polar semiconductor LiAsSe2 upon application of strain. I will also describe the photoferroelectric properties of methylammonium lead iodide, helping to explain how illumination influences the piezoelectric properties. I will demonstrate that driving a polar material through the topological insulator transition enhances the BPVE.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.