Excitons in 3D Pb-free Bulk and in Mixed 3D/2D Hybrid Perovskites: Optical Signatures and Spatial Localization

Dr. Giacomo-Giorgi
University of Perugia, Italy

By Dr. Giacomo-Giorgi, University of Perugia, Italy.
Organic-Inorganic Halide Perovskites (OIHPs) are undoubtedly playing the key role in the realm of modern photovoltaics (PV): [1] bulk OIHPs, characterized by the general ABX3 stoichiometry, have been shown indeed to possess unique features in solar-to-energy applications. [2] Nevertheless, the presence of few intrinsic detrimental issues still prevents their usage for device mass production. Critical in this sense is the presence of both a hydrophilic organic moiety (i.e. methylammonium, CH3NH3+, MA, A-site cation) which enhances the air/moisture mediated degradability, thus limiting the lifetime of 3D OIHPs based devices, and of a pollutant, Pb (B-site cation), which raises the con-cerns towards environmental issues. While for this latter drawback the immediate solu-tion is the replacement of lead with other, more ecofriendly, cations,[3] the possible solu-tion of the former involves the total/partial replacement of MA with longer chain, hy-drophobic, aromatic or aliphatic, cations whose presence induces a change in the dimen-sionality of the final systems. These so-called mixed 2D/3D Ruddlesden-Popper Perov-skites (RPPs) have emerged as an alternative to 3D bulk for their superior photo- and chemical-stability coupled with high-performance optoelectronic properties. Several experimental papers have been recently published revealing the interest of the community towards this class of materials. [4] At the same time ab-initio studies focusing on the role of many-body effects are very limited and their results are not yet conclusive.
In my seminar, after a quick voyage over the general properties of the 3D bulk OIHPs, I will discuss my work based on Density Functional Theory (DFT), Green Function (GW), and Bethe Salpeter Equation (BSE) simulations, which has shown the appealing optoelectronic properties of novel and overlooked Pb-free fully inorganic perovskites. [5] Focusing then on the A-site cation replacement, I will introduce RPPs discussing their electronic and optical properties ‒obtained with the same theoretical setup‒ both as iso-lated nanosheets (NS) and as periodic quantum wells (QW). [6] I will finally rationalize the relationship existing between structures (number of layers) and optoelectronic features.
References
[1] Kojima, A. et al., J. Am. Chem. Soc., 2009, 131, 6050-6051.
[2] See among the others: (a) G.G. et al., J. Phys. Chem. Lett. 2013, 4, 4213−4216; (b) Xing, G. et al., Science, 2013, 342, 344−347; (c) Stranks, S. D. et al., Science, 2013, 342, 341−344; (d) G.G. and Yamashita, K., J. Mater. Chem. A, 2015, 3, 8981-8991.
[3] Ogomi, Y. et al., J. Phys. Chem. Lett., 2014, 5, 1004–1011.
[4] Mitzi, D., Chem. Mater. 1996, 8, 791-800.
[5] G.G., et al., J. Mater. Chem. C, 2018, 6, 10197-10201.

Biography

Giacomo Giorgi (GG) is Associate Professor at the Department of Civil & Environmental Engineering (DICA) at the University of Perugia. He is nowadays focusing his research on the ab-initio study of electronic and optical properties of materials for solar-to-energy conversion. He is author of approximately 70 publications including articles in international peer-reviewed journals, several book chapters, and review articles. He has given a total ~20 invited talks, lectures, and seminars.
After obtaining his PhD (2003) under the supervision of Prof. A. Sgamellotti, he has spent his first postdoctoral experience at the University of Tokyo in 2006 in the group led by Prof. Koichi Yamashita, group where he spent a period of research from 2009 to 2012. In 2012 he has got a Project Assistant Professorship at the Research Center for Advanced Science and Technology (RCAST) at The University of Tokyo in the group of led by Prof. Hiroshi Segawa. From 2013 to 2015 he has been Senior Researcher at the Department of Chemical Syste Engineering, The University of Tokyo, Japan, still in the group led by Koichi Yamashita.

Keynotes
Dr. Ines Garcia Benito
EPFL, Switzerland

Engineering 2D/3D Hybrid Perovskites for Stable and Efficient Solar Cells

By Dr Ines Garcia Benito, EPFL, Switzerland. Three-dimensional (3D) methylammonium lead iodide perovskite solar cells are undoubtedly leading the photovoltaic scene ...

Read More

Dr. Luis Miguel MirandaINESCTEC, Portugal

Validating Microgrids Islanding and Black Start Procedures in a Laboratorial Environment

By Dr. Luís Miguel Miranda, INESCTEC, Portugal. Microgrids (MG) are extremely flexible low voltage (LV) networks capable of operating interconnected with ...

Read More

Prof. Raymond AdomaitisUniversity of Maryland, USA

Engineering and Automation Perspectives of Team Maryland in the 2017 US Solar Decathlon

By Prof. Raymond Adomaitis, University of Maryland, USA. The engineering design of reACT (resilient Adaptive Climate Technology) was driven by a ...

Read More

Dr. Samuel Magorrian
National Graphene Institute in Manchester, UK

Optoelectronics of two - dimensional post - transition metal chalcogenides

By Dr. Samuel Magorrian, National Graphene Institute in Manchester, UK We present the analysis of electronic band structure of InSe and ...

Read More

Dr. Giacomo-Giorgi
University of Perugia, Italy

Excitons in 3D Pb-free Bulk and in Mixed 3D/2D Hybrid Perovskites: Optical Signatures and Spatial Localization

By Dr. Giacomo-Giorgi, University of Perugia, Italy. Organic-Inorganic Halide Perovskites (OIHPs) are undoubtedly playing the key role in the realm of ...

Read More

Dr. Ralf Hunger
Head of Process Integration
Solibro Hi-tech GmbH

Solibro CIGS Technology – from small cell CIGS devices to industrial manufacturing in a global production

By Dr. Ralf Hunger, Head of Process Integration, Solibro Hi-tech GmbH, Germany. Solibro is an international group of research, engineering, and ...

Read More

Dr. Jie XiaoPacific Northwest national laboratory & University of Arkansas, USA

Understanding Lithium Metal Failure Mechanism in Realistic High-Energy Pouch Cells

By Dr. Jie Xiao, Pacific Northwest national laboratory & University of Arkansas, USA To significantly boost the energy of the state-of-art ...

Read More

Prof. Bulent Akinoglu Middle East Technical University, Ankara, Turkey

Long and short term PV module and array performance calculations and feasibility studies

By Prof. Bulent Akinoglu, Middle East Technical University, Ankara, Turkey. While solar photovoltaic (PV) R/D is heavily continuing, worldwide solar power ...

Read More

Dr Lukas Sigrist

Operation of Isolated Power Systems under High Shares of Renewables

By Dr Lukas Sigrist, Universidad Pontificia Comillas, Spain. The increasing penetration of large shares of renewable energy resources allows reducing ...

Read More

Prof. Masataka Nagaoka/b>Nagoya University, Japan

Microscopic Additive Effect on SEI Film Formation in Sodium-Ion Batteries: A Computational Chemical Study based on Red Moon Methodology

By Prof. Masataka Nagaoka, Nagoya University, Japan. Recently, we have developed a new efficient hybrid Monte Carlo (MC)/molecular dynamics (MD) reaction ...

Read More

Mr. Jose Benlloch FernandezMayor of  Vila-real City, Spain

Support for innovation from the Local Government: the example of Valencian cities network for innovation

By Mr. Jose Benlloch Fernandez, Mayor of Vila-real City, Spain. For the most advanced modern societies, the promotion of knowledge is ...

Read More

Dr. Maria Wall Lund University, Sweden

Towards zero-energy buildings and neighborhoods

By Dr Maria Wall, Associate Prof., Division of Energy and Building Design, Lund University, Sweden. The presentation will cover topics as: - ...

Read More

Prof.  João A. Peças Lopes
Porto University, Portugal

Use of Microgrids and DERs for black start and islanding operation

By Prof. Joao Peças Lopes, Porto University, Portugal. Microgrids can be considered as the building block of a SmartGrid. These networks ...

Read More

Dr Teodor Todorov 
IBM, Watson Research Center, Yorktown Heights, USA

Progress and Challenges in High-efficiency Kesterite Solar Cells

By Dr. Teodor Todorov, IBM T. J. Watson Research Center, Yorktown Heights, USA. Thin-film multinary chalcogenide absorbers have numerous attractive properties ...

Read More

Dr. Ivan GordonSilicon PV group, imec, Belgium.

Towards the ultimate Silicon solar cell and module

By Dr. Ivan Gordon, Silicon PV group, imec, Belgium. In this presentation, the current status and the main R&D challenges of ...

Read More

Strategies for hole transporting layer for efficient and stable perovskite solar cells

By Dr Samrana Kazim, BCMaterials-Basque Center for Materials, Applications and Nanostructures, Leioa, Spain. Hybrid organic-inorganic perovskite solar cells (PSCs) have shown ...

Read More

Prof. Juan Bautista Carda Castelló,Universitat Jaume I, Spain

The quest for new functional applications of environmentally friendly ceramic tiles in the context of a circular economy

Prof. Juan Bautista Carda Castelló, Universitat Jaume I, Spain The Spanish industry of ceramic tiles manufacturing is mainly concentrated in Castelló, ...

Read More

Dr. Edgardo Saucedo
IREC, Spain

Kesterite Thin Film Photovoltaics: Review on Cationic and Anionic Substitution for High Efficiency Solar Cells

By Dr. Edgardo Saucedo, Catalonia Institute for Energy Research (IREC), Barcelona, Spain. The so called kesterite (Cu2ZnSn(S,Se)4 – CZTSSe; Cu2ZnSnS4 – ...

Read More

Dr. Karim Zaghib Director at Hydro-Québec, Canada

Safe Li-ion Batteries and Beyond for Energy Storage and EVs

By Dr. Karim Zaghib, Director at Hydro-Québec, Canada. We report a Li-ion battery that can be charged within few minutes, passes ...

Read More

Prof. Teofilo Rojo CIC Energigune, Spain

Recent advances, current challenges and future trends on sodium-ion batteries.

By Prof. Teófilo ROJO 1. Department of Inorganic Chemistry. Faculty of Science and Technology. University of the Basque Country (UPV/EHU), ...

Read More

Prof. Ahmed EnnaouiChairman of the Scientific Council - IRESEN

Development of High performance Cadmium free Cu-chalcopyrite thin film solar cells with CBD-Zn(S,O) buffer layer

By Prof. Ahmed Ennaoui, Chairman of the Scientific Council, Institut de Recherche en Energie Solaire et Energies Nouvelles (IRESEN), Rabat, ...

Read More

Dr. Saad Baradiy, iproplan® Planungsgesellschaft mbH, Germany.

Energy Efficiency and using of Renewable Energy In the field of tension between prosperity, environmental protection, resource conservation and economical aspects

By Dr. Saad Baradiy, iproplan® Planungsgesellschaft mbH, Germany. The author will explain the state of the art in Germany with current ...

Read More

Prof. Moncef KrartiUniversity of Colorado, USA

Benefits of Scale-up Building Energy Efficiency Programs

By Prof. Moncef Krarti, University of Colorado, USA. The presentation introduces a new concept of energy productivity that accounts for both ...

Read More

Ismael Saadoune

Ismael Saadoune

Prof. Ismael Saadoune FST, Cadi Ayyad University, Marrakech, Morocco Prof. Ismael Saadoune, FST, Cadi Ayyad University, Marrakech, Morocco. Biography Ismael SAADOUNE, Full Professor in the ...

Read More

Khalil Amine

Khalil Amine

By Dr. Khalil Amine, distinguished Fellow and manager of the Advanced Lithium Battery Technology program at Argonne National Laboratory, IL, ...

Read More

Prof. Dieter Meissner

Crystalsol's Printed Single Crystalline Kesterite Photovoltaic Modules

By Prof. Dieter Meissner, Tallinn University of Technology, Estonia. Crystalsol, a spin-out company of Tallinn University of Technology, has developed a ...

Read More

Prof. Abdelkader Kara
University of Central Florida, USA

Interface Characteristics of 2D Organic Materials on Metal Surfaces

By Prof. Abdelkader Kara, University of Central Florida, USA. Organic materials are playing an increasing role in electronics and particularly in ...

Read More

Prof. Abdelilah Benyoussef
Moroccan Foundation for Advanced Science, Innovation and Research, Morocco

Abdelilah Benyoussef

Prof. Abdelilah Benyoussef, Moroccan Foundation for Advanced Science, Innovation and Research, Morocco. Prof. Abdelilah Benyoussef received his "Doctorat d’état" degree from ...

Read More

Hamid Oughaddou
Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud,  France

New 2D materials: silicene and phosphorene

By Prof. Hamid Oughaddou, Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud, France The remarkable properties of graphene stem from its two-dimensional ...

Read More

Structural Disorder in Kesterite-type Semiconductors

Structural Disorder in Kesterite-type Semiconductors

By Prof. Dr. Susan Schorr, Helmholtz-Zentrum Berlin, Germany. Kesterite-type compound semiconductors (Cu2ZnSnS4 – CZTS, Cu2ZnSnSe4 – CZTSe) are probably the most ...

Read More

Mohammad Khaja Nazeeruddin

Mohammad Khaja Nazeeruddin

Biography Prof. Mohammad K. Nazeeruddin current research at EPFL focuses on Dye Sensitized and Perovskite Solar Cells, CO2 reduction, Hydrogen production, ...

Read More

Dr Oliver Groning

Engineering of novel electronic materials by the atomically precise on-surface synthesis of graphene nanostructures

Dr. Oliver Gröning, Empa Materials Science and Technology, Dübendorf, Switzerland Graphene provides an ideal platform to create diverse electronic properties by ...

Read More

Prof. Clas PerssonUniversity of Oslo, Norway & KTH Royal Institute of Technology, Stockholm, Sweden

Copper-based chalcogenides for ultrathin inorganic solar cells

Emerging Cu-based materials are explored to benefit from the energetically high-lying Cu d-state in combination with low effective mass of ...

Read More

Prof. Ari Paavo Seitsonen
École Normale Supérieure, Paris, France

Computer modelling and design of two-dimensional materials beyond graphene

By Dr. Ari Paavo Seitsonen, Research Engineer at École Normale Supérieure, Paris, France. The continuous miniaturization, emergence of the practical realization ...

Read More

Prof. Ahmad ShahzadaBCMaterials, Bilbao, Spain

Perovskite solar cells: A paradigm shift in thin film photovoltaics research

By Prof. Shahzada Ahmad, Basque Center for Materials, Applications, and Nanostructures, Leioa, Spain. Perovskites solar cells (PSCs) have emerged as a ...

Read More

Special Issue

Partners

  • Ministry of Energy, Mines, and  Sustainable Development
  • L'economiste - daily newspaper
  • Energies Environnement Mag
  • Faculty of Science - Rabat
  • Mohammed V University
  • ENSIAS
  • IEEE Morocco Section
  • University of Abdelmalek Essaadi
  • Solar Cluster
  • ISES - International Solar Energy Society
  • emi
  • giz
  • masen

Important dates

Late Submission Deadline October 10, 2018
Notification to authors October 22, 2018
Final version due November 08, 2018
Registration deadline November 08, 2018
IRSEC'18 Conference Dec., 5-8, 2018