Thu Apr 02 2020
Online Meetup - 13:00h UTC - 15:00 CEST
Chair: Bruno Ehrler
13:00 - 13:05
Hernandez, Monica
Presentation by nanoGe
Hernandez, Monica
Monica Hernandez a
a, nanoGe, Carrer de Campoamor, 73 bajo Izq., València, ES

Meetup Presentation

This online seminar brings the scientific conference gathering to the desktops or smartphones of scientists worldwide. Researchers can present their work and keep up with cutting-edge research in the field while reducing their carbon footprint, improve the work-life balance and keep the sense of community.

It will consist of two parts, in which interaction will be the main force:

  - The Oral Session will consist on a few short broadcasted talks led by Invited Speakers, followed by a time for questions from the public driven by a moderator.

  - ePoster Session, where attendees and authors can share their ideas and get feedback from their colleagues worldwide through a chatroom.

All participants can join and present here their work. Due to the short format of the meeting (with few oral contributions), we encourage senior researchers to present ePoster, and of course we expect enthusiastic participation of junior researchers.

13:05 - 13:15
Abstract not programmed
13:15 - 13:30
Kirchartz, Thomas
Forschungszentrum Jülich GmbH, DE
Impact of Defects on Halide Perovskite Solar Cells
Kirchartz, Thomas
Forschungszentrum Jülich GmbH, DE, DE

He studied electrical engineering in Stuttgart and started working on Si solar cells in 2004 under the guidance of Uwe Rau at the Institute for Physical Electronics (ipe) in Stuttgart. After finishing his undergraduate studies in 2006, he continued working with Uwe Rau first in Stuttgart and later in Juelich on simulations and electroluminescence spectroscopy of solar cells. After finishing his PhD in 2009 and 1.5 years of postdoc work in Juelich, Thomas Kirchartz started a three year fellowship at Imperial College London working on recombination mechanisms in organic solar cells with Jenny Nelson. In 2013, he returned to Germany and accepted a position as head of a new activity on hybrid and organic solar cells in Juelich and simultaneously as Professor for Photovoltaics with Nanostructured Materials in the department of Electrical Engineering and Information Technology at the University Duisburg-Essen. Kirchartz has published >100 isi-listed papers, has co-edited one book on characterization of thin-film solar cells whose second edition was published in 2016 and currently has an h-index of 38.

Thomas Kirchartz a
a, Institute of Energy and Climate Research, IEK-5 Photovoltaics, Forschungszentrum Jülich, DE, Wilhelm-Johnen-Straße, Jülich, DE

Defects are an important topic for every photovoltaic material, because they reduce the open-circuit voltage and thereby also the power conversion efficiency. While metal-halide perovskites are considered to be defect tolerant materials, they are not immune to the influence of defects. The talk attempts to answer three questions, namely do defects matter in lead-halide perovskite solar cells, do they matter in the bulk or at interfaces and finally, where in the band gap are these defects? The first question of the importance of defects in general is easily studied by looking at current high Voc and high luminescence perovskite solar cells.1-3 So far perovskite solar cells haven’t beaten the level of 10% external luminescence quantum efficiency, which implies that still 90% of recombination events eventually produce heat. Therefore, non-radiative recombination is still highly relevant, at least at one sun conditions. The second question of where the defects matter has no generic answer. However, for many practical situations, the interfaces between absorber and electron or hole transfer layers limit the open-circuit voltage.4-5 This implies that it is defects at these interfaces that are most important for further improving efficiencies. The final question deals with the question of where the defects are in energy. For a defect to be highly recombination active, it has to capture electrons and holes efficiently with the slower of the two capture processes limiting the total rate. The classical models of recombination assuming a parabolic potential energy surface (harmonic approximation) predict that defects with energy levels extremely close to midgap should be the most recombination active.6-7 However, to fully understand the situation in perovskite solar cells, calculations including anharmonicity8 have to be performed in the future. 

1.  Krückemeier, L.; Rau, U.; Stolterfoht, M.; Kirchartz, T., How to Report Record Open-Circuit Voltages in Lead-Halide Perovskite Solar Cells. Advanced Energy Materials 2020, 10 (1), 1902573.

2.  Liu, Z.; Krückemeier, L.; Krogmeier, B.; Klingebiel, B.; Marquez, J. A.; Levcenko, S.; Öz, S.; Mathur, S.; Rau, U.; Unold, T.; Kirchartz, T., Open-Circuit Voltages Exceeding 1.26 V in Planar Methylammonium Lead Iodide Perovskite Solar Cells. ACS Energy Letters 2019, 4, 110-117.

3.  Jiang, Q.; Zhao, Y.; Zhang, X.; Yang, X.; Chen, Y.; Chu, Z.; Ye, Q.; Li, X.; Yin, Z.; You, J., Surface passivation of perovskite film for efficient solar cells. Nature Photonics 2019, 13, 460-466.

4.  Stolterfoht, M.; Caprioglio, P.; Wolff, C. M.; Marquez, J. A.; Nordmann, J.; Zhang, S.; Rothhardt, D.; Hörmann, U.; Amir, Y.; Redinger, A.; Kegelmann, L.; Zu, F.; Albrecht, S.; Koch, N.; Kirchartz, T.; Saliba, M.; Unold, T.; Neher, D., The impact of energy alignment and interfacial recombination on the internal and external open-circuit voltage of perovskite solar cells. Energy & Environmental Science 2019, 12 (9), 2778-2788.

13:30 - 13:45
Walsh, Aron
Point Defects and Beyond…
Walsh, Aron
Aron Walsh a
a, Imperial College London, United Kingdom, South Kensington, Londres, Reino Unido, GB

Prof. Aron Walsh holds the Chair in Materials Design at Imperial College London. He was awarded his Ph.D in Chemistry from Trinity College Dublin and later worked at the National Renewable Energy Laboratory, University College London, and University of Bath.

His research involves cutting-edge materials theory and simulation applied to problems across solid-state chemistry and physics, including materials for solar cells and fuels, batteries, thermoelectrics, and solid-state lighting. He has an expertise in the theory of semiconductors and dielectrics, and is developing innovative solutions for materials data, informatics and design. His group published a review on machine learning for molecules and materials in Nature.

13:45 - 14:00
Petrozza, Annamaria
Understanding Defect Physics to Stabilize Metal-halide Perovskite Semiconductors for Optoelectronic Applications
Petrozza, Annamaria
Annamaria Petrozza a
a, CNST, Istituto Italiano di Tecnologia, Milano, Via Giovanni Pascoli, 70, Milano, IT

Here, first I will summarize our understanding of the nature of defects and their photo-chemistry, which leverages on the cooperative action of density functional theory investigations and accurate experimental design. Then, I will show the correlation between the nature of defects and the observed semiconductor instabilities. We identify photo-instabilities related to competing light-induced formation and annihilation of trap states, disclosing their characteristic length and time scales and the factors responsible for both processes. We show that short range/short time defect annihilation can prevail over defect formation, happening on longer scales, when effectively blocking undercoordinated surface sites, which act as a defect reservoir. Finally, based on such knowledge, I will discuss different synthetic and passivation strategies which are able to stabilize the perovskite layer towards such photo-induced instabilities, leading to improved optoelectronic material quality and enhanced photo-stability in a working solar cell.

14:00 - 14:30
14:30 - 15:00
15:00 - 16:30
ePoster Session - 15:00 UTC - 17:00 CEST
Juan Bisquert, Seul-Gi Kim, Antonio Guerrero, Nam-Gyu Park
Kinetic Stabilization of Perovskite Contact Ionic Double Layer by K-doping
Sang-Hyun Chin, Jin Woo Choi, Ziqi Hu, Lorenzo Pietro Mardegan, Michele Sessolo, Henk J. Bolink
Highly Luminescent Lead Bromide and Perovskite Solutions
Mark Mangnus, Freddy T. Rabouw
Dynamics of Anion-exchange Reactions in Perovskite Nanocrystals
Ana M. Igual-Muñoz, Javier Navarro-Alapont, Chris Dreessen, Michele Sessolo, Henk Bolink
Low Temperature Vacuum-deposition of CsPbI2Br Thin-films and Solar Cells
Noor Titan Putri Hartono, Janak Thapa, Armi Tiihonen, Felipe Oviedo, Clio Batali, Jason J. Yoo, Zhe Liu, Ruipeng Li, David Fuertes Marrón, Moungi G. Bawendi, Tonio Buonassisi, Shijing Sun
Machine-Learning-Assisted Design Guideline of Capping Layer for Improving Perovskite Solar Cells Stability
Germà Garcia-Belmonte, Osbel Almora, Marisé García-Batlle
Extracting Defect Density from Capacitive Methods?
Daniel Pérez-del-Rey, Pablo Boix, Michele Sessolo, Henk Bolink
Molecular Passivation of MoO3: Band Alignment and Protection of Charge Transport Layers in Vacuum-Deposited Perovskite Solar Cells
Shyantan Dasgupta, Kasjan Misztal, Rosinda Fuentes Pineda, Sylvester Sahayaraj, Robert Kudrawiec, Artur.P. Herman, Wojciech Mroz, Alex Barker, Taimoor Ahmad, Jarosław Serafińczuk, Aldo di Carlo, Annamaria Petrozza, Alina Dudkowiak, Konrad Wojciechowski
Improved Colloidal Stability of Precursor Solution by a Novel HI Acid Controlled Route of Methylammonium Iodide Synthesis for Efficacious Solar Cells
Lucie McGovern, Moritz Futscher, Eline Hutter, Loreta Muscarella, Bruno Ehrler
Understanding the Kinetics of Phase Segregation - Ion Migration in Mixed-Halide Perovskites
Dmitry Baranov, Zhiya Dang, Liberato Manna
Cs4PbBr6-CsPbBr3 Nanoheterosctructures
José Manuel Vicent-Luna, Salvador R. G. Balestra, Sofía Calero, Juan A. Anta, Shuxia Tao
Molecular Dynamics Investigation of the Ion Migration of Inorganic Metal Halide Perovskites
Sofia Apergi, Geert Brocks, Shuxia Tao
Tuning the Electronic Levels of NiO with Alkali Halides
Aleš Vlk, Zdeněk Remeš, Jakub Holovský, Lucie Landová, Martin Ledinský
Complexity of Perovskites Absorption Measurements
Jeffrey DuBose, Prashant Kamat
TiO2-Assisted Halide Ion Segregation in Mixed Halide Perovskite Films
Preethi S Mathew, Gergely Samu, Csaba Janaky, Prashant Kamat
Photoinduced Iodide Expulsion from Mixed Halide Perovskites
Chris Dreessen, Daniel Pérez-del-Rey, Pablo P. Boix, Henk J. Bolink
Voltage-Dependent Photoluminescence Quantum Yield in Perovskite Solar Cells
Quinten A. Akkerman, Eva Bladt, Sara Bals, Liberato Manna
Fully Inorganic Ruddlesden–Popper Double Cl–I and Triple Cl–Br–I Lead Halide Perovskite Nanocrystals
Loreta A. Muscarella, Eline M. Hutter, Lucie McGovern, Francesca Wittmann, Aron Walsh, Jan Versluis, Huib Bakker, Bruno Ehrler
Toward kinetic stabilization of halide migration in pure and mixed-halide perovskite
Isabel Koschany, Lucie McGovern, Bruno Ehrler
Where do ions migrate in perovskite solar cells, in the bulk or at the grain boundaries?
Martin Stolterfoht, Max Grischek, Pietro Caprioglio, Christian M. Wolff, Emilio Gutierrez-Partida, Francisco Peña‐Camargo, Daniel Rothhardt, Shanshan Zhang, Meysam Raoufi, Jakob Wolansky, Mojtaba Abdi-Jalebi, Samuel D. Stranks, Steve Albrecht, Thomas Kirchartz, Dieter Neher
Intensity-dependent PL Measurements Reveal the Contribution of Bulk, Interface and Surface Recombination Losses in Perovskite Solar Cells
Junsang Cho, Jeffrey DuBose, Prashant Kamat
Dominant Role of Exciton Binding Energy in Charge Carrier Recombination of 2D Perovskites
Pilar Lopez-Varo, Yong Huang, Jean-Baptiste Puel, Katherine Alvino-Saavedra, Manuel Garcia-Rosell, Juan-Antonio Jimenez-Tejada
Effect of Ion Migration in Perovskite Solar Cells
Sergio Castro-Hermosa, Izabela Bicalho, Luiza Corrêa, Luana W. de Menezes, Rodrigo Vilaça, Edson Morgado, Thomas M. Brown, Diego Bagnis
Paving the Way for Fully Printable Perovskite Solar Cells
Paz Sebastia-Luna, Javier Navarro-Alapont, Michele Sessolo, Francisco Palazon, Henk Bolink
Solvent-Free Synthesis and Deposition of Cesium Copper Halides with Bright Blue Photoluminescence
Jeffery Coffer
Interfacial Effects in Perovskite Nanostructures Templated by Porous Silicon (pSi)
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