The Stratakis Lab

The Stratakis Lab

Ultrafast Laser Micro and Nano Processing Laboratory

Synthesis of Perovksite Nanocrystals and Related Applications

Synthesis of perovskite nanocrystals and related applications

Abstract:

The high demand for smart and portable devices in everyday life activities creates a great need for energy supply and sensors, are driving the scientific community to explore novel materials for efficient energy conversion,storage and sensing elements. Perovskites, a prominent category of materials, including metal halides and perovskite oxides hold a significant role among energy materials but also as sensing elements, which can effectively replace the conventional ones.. Nanostructuring of the perovskites due to their reduced dimensions are advantageous in offering large surface area, extensive porous structures, controlled transport and charge-carrier mobility, strong absorption and photoluminescence and confinement effects. These features together with the unique tunability in composition, shape and functionalities make the perovskite nanocrystals, uniquely suited for efficient energy-related applications such as photovoltaics, catalysts, thermoelectrics, batteries, supercapacitors and hydrogen storage systems, as well as replacing common metal oxides as sensing elements.

All-inorganic metal-halide perovskite nanostructures in liquid form or/and directly deposited on substrates

The research of our group is mainly focus on the development of all-inorganic metal halide perovskites. These semiconducting nanocrystals exhibit a completely different behavior from their bulk materials of the same stoichiometry due to quantum confinement effects. Optical/electronic properties can be affected in an unexpected way from the size/shape particle modifications. Their fascinating properties together with their colloidal form make these materials ideal candidates for application in energy-related applications.

Wet chemistry approaches have been used for the synthesis of perovskite nanostructures in centrosymmetric or non-centrosymmetric morphologies (spherical particles, nanoplatelets, nanosheets or more complex structures). These approaches have been carefully selected because they can allow developing finely size-, shape-, and composition- tailored nanocrystals by careful regulation of thermodynamically/kinetically driven growth processes in the liquid phase.

The perovskite nanocrystals synthesized with wet chemistry methods are well crystalline and dispersed in organic solvents as they covered with organic ligands. They exhibit very high quantum yields, narrow line width and high stability. Their emission could cover the whole visible range by modifying their composition, morphology and size. Anion exchange processes (chemically or laser-triggered) have been utilized for the spectral tuning through partial or complete replacement of anion in a solution. In the anion exchange procedures, the initial lattice and shape of the nanocrystals are retained.

The morphological or structural characteristics of the nanocrystals can be modified by laser-assisted processes using femtosecond laser irradiation.

Metal halide perovskite nanostructures covered by organic molecules or free of ligands have been grown in colloidal solutions and then deposited on substrate or grown directly on it. Their structural features together with their physical properties have been carefully investigated and the impact of the structure, morphology, and composition on energy device performance have been evaluated.

Publications

[1] A. Kostopoulou, K. Brintakis, NK. Nasikas, E. Stratakis, Perovskite nanocrystals for energy conversion and storage, Nanophotonics 2019, 8, 1607-1640.

[2] A. Heuer-Jungemann, N. Feliu, I. Bakaimi, M. Hamaly, A. Alkilany, I. Chakraborty, A. Masood, M. F. Casula, A. Kostopoulou, E. Oh, K. Susumu, M. H. Stewart, I. L. Medintz, E. Stratakis, W. J. Parak, A. G. Kanaras, The role of ligands in the chemical synthesis and applications of inorganic nanoparticles, Chemical Reviews 2019, 119, 4819-4880 (Front Cover).

[3] K. Brintakis, E. Gagaoudakis, A. Kostopoulou, V. Faka, K. Argyrou, V. Binas, G. Kiriakidis, E. Stratakis, Ligand-free all-inorganic metal halide nanocubes for fast, ultra-sensitive and self-powered ozone sensors, Nanoscale Adv. 2019, 1, 2699-2706.

[4] A. Kostopoulou, D. Vernardou, K. Savva, E. Stratakis, All-inorganic lead halide perovskite nanohexagons for high performance air-stable lithium batteries, Nanoscale 2019, 11, 882-889.

[5] A. Kostopoulou, E. Kymakis, E. Stratakis, Perovskite nanostructures for photovoltaic and energy storage devices, J. Mater. Chem. A, 2018, 6, 9765-9798.

[6] M. Sygletou, M.E. Kyrazi, A.G. Kanaras, E. Stratakis, Anion Exchange in Inorganic Perovskite Nanocrystal Polymer Composites, Chemical Science 2018, 9, 8121-8126.

[7] A. Kostopoulou, M. Sygletou, K. Brintakis, A. Lappas, E. Stratakis, Low-temperature Benchtop-synthesis of All-inorganic Perovskite Nanowires, Nanoscale, 2017, 9, 18202-18207.

Project Members

Dr. Emmanuel Stratakis

Dr. Athanasia Kostopoulou

Dr. Konstantinos Brintakis

Dr. Kyriaki Savva

Mrs Aikaterini Argyrou

Mr Nikolaos Livakas

Mrs Michaila-Akathi Pantelaiou

Collaborators

Dr. Dimitra Vernardou (Hellenic Mediterranean University, HMU)

Dr. Alexandros Lappas (IESL-FORTH)

Dr. Emmanuel Gagaoudakis (IESL-FORTH)

Dr. Vasileios Binas (IESL-FORTH)

Prof George Kyriakidis (IESL-FORTH)

Dr. Konstantinos Petridis (HMU)

Prof Charalambos Lambropoulos (Kapodistrian University of Athens)

Prof Liberato Manna (Istituto Italiano Di Tecnologia)

Dr. Raivo Jaaniso (University of Tartu)

Prof Antonios Kanaras (Univesity of Southampton)

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