Giuliano Gregori
Max Planck Society
80 Papers
521 Citations
Giuliano Gregori is an academic researcher from Max Planck Society. The author has contributed to research in topics: Grain boundary & Nanocrystalline material. The author has an hindex of 26, co-authored 80 publications. Previous affiliations of Giuliano Gregori include University of Bayreuth & University of Trieste.
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Papers
Mixed‐Organic‐Cation Perovskite Photovoltaics for Enhanced Solar‐Light Harvesting
Norman Pellet,Peng Gao,Giuliano Gregori,Tae-Youl Yang,Mohammad Khaja Nazeeruddin,Joachim Maier,Michael Grätzel,Michael Grätzel +7 more
TL;DR: This work shows that the goal of extending the optical-absorption onset of perovskite-based photovoltaics further into the red to enhance solar-light harvesting can be reached by using a mixture of formamidinium and methylammonium cations, which leads to an enhanced short-circuit current and thus superior devices to those based on only CH3 NH3 (+).
The Significance of Ion Conduction in a Hybrid Organic–Inorganic Lead-Iodide-Based Perovskite Photosensitizer
Tae-Youl Yang,Giuliano Gregori,Norman Pellet,Norman Pellet,Michael Grätzel,Michael Grätzel,Joachim Maier +6 more
TL;DR: It is shown that methylammonium (but also formamidinium) iodoplumbates are mixed conductors with a large fraction of ion conduction because of iodine ions, providing insight into electrical charge transport in the hybrid organic-inorganic lead halide solar cells as well as into new possibilities of improving the photovoltaic performance by controlling the ionic disorder.
587
Large tunable photoeffect on ion conduction in halide perovskites and implications for photodecomposition
Gee Yeong Kim,Alessandro Senocrate,Alessandro Senocrate,Tae-Youl Yang,Giuliano Gregori,Michael Grätzel,Michael Grätzel,Joachim Maier +7 more
TL;DR: Light excitation enhances by several orders of magnitude the ionic conductivity of methylammonium lead iodide, the archetypal metal halide photovoltaic material, and straightforwardly leads to a hitherto unconsidered photodecomposition path of the perovskite.
521
The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach
Alessandro Senocrate,Igor L. Moudrakovski,Gee Yeong Kim,Tae-Youl Yang,Giuliano Gregori,Michael Grätzel,Michael Grätzel,Joachim Maier +7 more
TL;DR: Iodine ions are unambiguously shown to be the mobile species in CH3NH3PbI3, with iodine vacancies shown to represent the mechanistic centers under equilibrium conditions, and local variations of the iodine stoichiometry may be fast and enable light effects on ion transport.
271
Ion conduction and redistribution at grain boundaries in oxide systems
TL;DR: In this paper, a comprehensive overview on the major findings regarding ion redistribution at interfaces in oxide systems and its effects on the electrical transport properties is provided. But, as far as the fundamental properties are concerned, major emphasis is laid on the impact on ion conductivity.
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