The program is in CET Time, check the time converter to know your local time.
 
Program
 
Thu Feb 23 2023
08:00 - 09:00
Registration
09:00 - 09:15
nanoGe Introduction and opening
Wolfgang Tress
Chair: Jovana Milic
09:15 - 09:45
Tress-I1
Tress, Wolfgang
ZHAW
Perovskite Solar Cells under Real World Conditions
Tress, Wolfgang
ZHAW, CH
Authors
Wolfgang Tress a
Affiliations
a, ZHAW – Institute of Computational Physics, 8401 Winterthur, Switzerland
Abstract

Current stability tests in the lab mainly focus on maintaining the solar cells under constant ambient and operational conditions such as controlled temperature, one-sun equivalent illumination, and maximum power point [1]. However, solar cells under operation face volatility, in particular regarding illumination and temperature. Additionally, they might be exposed to open circuit or negative voltages in case of partial shading of a module with devices connected in series. Furthermore, slow reversible process triggered by light and accelerated by temperature, for instance due to ion migration, play an important role in the performance of perovskite solar cells.

In this talk I will give an overview on stability measurements under fluctuating ambient conditions. I will discuss the main factors influencing stability and the effect of reversible degradation. Furthermore, I will comment on the role of the voltage during degradation. I will highlight the advances that have been made since the initial studies [2,3] and address open challenges.

09:45 - 10:00
Discussion
10:00 - 10:30
Coffee break
Monica Lira Cantu
Chair: Jovana Milic
10:30 - 11:00
Cantu-I1
Lira-Cantu, Monica
Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Strategies for the Analysis of Perovskite Solar Cells under Outdoor (ISOS-O) Conditions
Lira-Cantu, Monica
Catalan Institute of Nanoscience and Nanotechnology (ICN2), ES

Prof. Mónica Lira-Cantú is Group Leader of the Nanostructured Materials for Photovoltaic Energy Group at the Catalan Institute of Nanoscience and Nanotechnology (www.icn.cat located in Barcelona (Spain). She obtained a Bachelor in Chemistry at the Monterrey Institute of Technology and Higher Education, ITESM Mexico (1992), obtained a Master and PhD in Materials Science at the Materials Science Institute of Barcelona (ICMAB) & Autonoma University of Barcelona (1995/1997) and completed a postdoctoral work under a contract with the company Schneider Electric/ICMAB (1998). From 1999 to 2001 she worked as Senior Staff Chemist at ExxonMobil Research & Engineering (formerly Mobil Technology Co) in New Jersey (USA) initiating a laboratory on energy related applications (fuel cells and membranes). She moved back to ICMAB in Barcelona, Spain in 2002. She received different awards/fellowships as a visiting scientist to the following laboratories: University of Oslo, Norway (2003), Riso National Laboratory, Denmark (2004/2005) and the Center for Advanced Science and Innovation, Japan (2006). In parallel to her duties as Group Leader at ICN2 (Spain), she is currently visiting scientist at the École Polytechnique Fédérale de Lausanne (EPFL, CH). Her research interests are the synthesis and application of nanostructured materials for Next-generation solar cells: Dye sensitized, hybrid, organic, all-oxide and perovskite solar cells. Monica Lira-Cantu has more than 85 published papers, 8 patents and 10 book chapters and 1 edited book (in preparation).

Authors
Monica Lira-Cantu a
Affiliations
a, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Edifici ICN2, Av. de Serragalliners, s/n, Bellaterra, ES
Abstract

Perovskite solar cells (PSCs) are one of the most efficient and cost-effective PV technologies with efficiencies reaching the 26 % mark. They have attracted substantial interest due to their light-harvesting capacity combined with low-cost manufacturing. However, unsolved questions of perovskite stability are still a concern, challenging their potential of widespread commercialization. Factors able to induce degradation to metal halide perovskite (MOHP) materials and devices, such as humidity, atmosphere, bias voltage, temperature, or light exposure, have been the centre of multiple studies and debates for many years. The ISOS stability assessment protocols, elaborated after a consensus among leading international laboratories, have been recently upgraded to incorporate stressors involving the peculiarities of PSCs. However, the understanding of the different degradation mechanisms taking place in materials and solar cells will only be effective if the applied stressors are as closed as possible to an actual functioning solar cell under real (outdoor) conditions. The application of real outdoor conditions (ISOS-O protocol) implies that multiple stressors are imposed to the sample with large variability and with different dosages. In this talk, I will show our most recent publications related to the issues observed for the analysis of PSCs under outdoor stability analysis (e.g. encapsulation). I will also show our most recent results on the interface and bulk modification of PSCs with the aim of enhancing device stability (indoor and outdoor), in this case our work is focus on the use of organic additives and MXenes. Finally, I will briefly describe our current work on in-situ and operando characterization, under single or multiple stressors with time, on PSCs to elucidate degradation mechanisms in these devices.

11:00 - 11:15
Discussion
Franklin Jaramillo
Chair: Jovana Milic
11:15 - 11:45
Jaramillo-I1
Jaramillo, Franklin
Universidad de Antioquia - UdeA, Colombia
Outdoor performance of perovskite solar minimodules: Ideality factor analysis and encapsulation challenges
Jaramillo, Franklin
Universidad de Antioquia - UdeA, Colombia, CO
Authors
Franklin Jaramillo a, Esteban Velilla a, Daniel Ramírez a, Edwin Ramírez a, Julian Gil a
Affiliations
a, Centro de Investigación y Desarrollo de Materiales (CIDEMAT), Universidad de Antioquia
Abstract

Halide perovskite solar cells is a very promising technology as an alternative to low cost and high-performance photovoltaics. Some of the main challenges of bringing perovskite technologies to market are efficiency, low cost and technically viable manufacturing, and long-term stability. Each of the key aspects has its own development; for example, efficiency has already surpassed values of 25%, and there are various publications demonstrating scalability and solution processing with very promising results particularly using slot die techniques [1]. This presentation will focus on two aspects: first, the analysis of ideality factor (nID) [2] for perovskite mini modules measured under outdoor conditions as a tool to follow up the performance and to understand the device degradation. Second, to mitigate this degradation process, some strategies to encapsulate the mini modules have been successfully implemented and evaluated.

Encapsulation tests have been carried out on minimodules fabricated on rigid and flexible substrates. In both cases, the edge-sealing structure for encapsulation was polyisobutylene (PIB) sealant by Quanex (SolarGain®) [3], [4]. In addition, glass and polymers coextruded with EVO were used as barrier material for rigid and flexible encapsulation, respectively. The encapsulation methodology developed is compatible with flexible substrates and allows the process to be carried out at a temperature of 100°C without compromising the thermal stability of the mini-modules. Finally, devices were tested under ambient conditions with MAPI perovskite solar cells in PIN structure and T80 efficiency was achieved after 1000 h of exposure.

Halide perovskite solar cells is a very promising technology as an alternative to low cost and high-performance photovoltaics. Some of the main challenges of bringing perovskite technologies to market are efficiency, low cost and technically viable manufacturing, and long-term stability. Each of the key aspects has its own development; for example, efficiency has already surpassed values of 25%, and there are various publications demonstrating scalability and solution processing with very promising results particularly using slot die techniques [1]. This presentation will focus on two aspects: first, the analysis of ideality factor (nID) [2] for perovskite mini modules measured under outdoor conditions as a tool to follow up the performance and to understand the device degradation. Second, to mitigate this degradation process, some strategies to encapsulate the mini modules have been successfully implemented and evaluated.

Encapsulation tests have been carried out on minimodules fabricated on rigid and flexible substrates. In both cases, the edge-sealing structure for encapsulation was polyisobutylene (PIB) sealant by Quanex (SolarGain®). In addition, glass and polymers coextruded with EVO were used as barrier material for rigid and flexible encapsulation, respectively. The encapsulation methodology developed is compatible with flexible substrates and allows the process to be carried out at a temperature of 100°C without compromising the thermal stability of the mini-modules. Finally, devices were tested under ambient conditions with MAPI perovskite solar cells in PIN structure and T80 efficiency was achieved after 1000 h of exposure.

11:45 - 12:00
Discussion
12:00 - 14:00
Lunch
Antonio Abate
Chair: Daniel Ramirez
14:00 - 14:30
Abate-I1
Abate, Antonio
Lead-Free Perovskite Solar Cells
Abate, Antonio
Authors
Antonio Abate a
Affiliations
a, Helmholtz-Zentrum Berlin
Abstract

Halide perovskites quickly overrun research activities in new materials for cost-effective and high-efficiency photovoltaic technologies.  Since the first demonstration from Kojima and co-workers in 2007, several perovskite-based solar cells have been reported and certified with rapidly improving power conversion efficiency, now approaching the theoretical limit.  Recent reports demonstrated that perovskites outperform the most efficient photovoltaic materials to date. At the same time, they still allow solution processing as a potential advantage in delivering a cost-effective solar technology.

The most stable and efficient perovskites contain lead, among the most toxic elements on earth. Lead-free alternatives have been reported with impressive progress in power conversion efficiency for tin-based (lead-free) perovskites. However, the stability of tin-based perovskite solar cells is still unexplored. In the present talk, we will focus on the stability of tin-based (lead-free) perovskite solar cells. We will show how the use of tin can actually improve the stability of perovksite solar cells. 

14:30 - 14:45
Discussion
Juan Bisquert
Chair: Daniel Ramirez
14:45 - 15:15
Bisquert-I1
Bisquert, Juan
Instituto de Tecnología Química (ITQ-UPV-CSIC)
Advances in kinetics processes of halide perovskite solar cells by neuron-style nonlinear model equations and electrooptical techniques
Bisquert, Juan
Instituto de Tecnología Química (ITQ-UPV-CSIC)

Juan Bisquert (pHD Universitat de València, 1991) is a Professor of applied physics at Universitat Jaume I de Castelló, Spain. He is the director of the Institute of Advanced Materials at UJI. He authored 360 peer reviewed papers, and a series of books including . Physics of Solar Cells: Perovskites, Organics, and Photovoltaics Fundamentals (CRC Press).  His h-index 95, and is currently a Senior Editor of the Journal of Physical Chemistry Letters. He conducts experimental and theoretical research on materials and devices for production and storage of clean energies. His main topics of interest are materials and processes in perovskite solar cells and solar fuel production. He has developed the application of measurement techniques and physical modeling of nanostructured energy devices, that relate the device operation with the elementary steps that take place at the nanoscale dimension: charge transfer, carrier transport, chemical reaction, etc., especially in the field of impedance spectroscopy, as well as general device models. He has been distinguished in the 2014-2019 list of ISI Highly Cited Researchers.

 

Authors
Juan Bisquert a
Affiliations
a, Institute of Advanced Materials (INAM), Universitat Jaume I, Castellón, Spain.
Abstract

The dynamic response of metal halide perovskite devices shows a variety of physical responses that need to be understood and classified for enhancing the performance and stability and for identifying physical behaviours that may lead to developing new applications. Beyond the well-established characteristics of regular impedance arcs, we address the appearance of inductor effect at high voltage in perovskite solar cell. We present a physical model in terms of delayed recombination current that explains the evolution of impedance spectra and the evolution of current-voltage curves. A multitude of chemical, biological, and material systems present an inductive behavior that is not electromagnetic in origin. Here, it is termed a chemical inductor. We show that the structure of the chemical inductor consists of a two-dimensional system that couples a fast conduction mode and a slowing down element. Therefore, it is generally defined in dynamical terms rather than by a specific physicochemical mechanism. The impedance spectra announce the type of hysteresis, either regular for capacitive response or inverted hysteresis for inductive response. We address the characterization of electron diffusion and radiative emission in halide perovskites using a range of light stimulated techniques as IMPS, IMVS, and voltage controlled light emission technique (LEVS).

15:15 - 15:30
Discussion
15:30 - 16:00
Coffee Break
Antonio Cabas
Chair: Daniel Ramirez
16:00 - 16:30
Cabas-I1
Cabas Vidani, Antonio
Fluxim AG, CH
Analysis of ionic charge carriers in FA-based perovskite and ageing of high-bandgap perovskite films and solar cells
Cabas Vidani, Antonio
Fluxim AG, CH, CH
Authors
Antonio Cabas Vidani a, Sandra Jenatsch a, Arno Gadola a, Daniele Braga a, Beat Ruhstaller a, b
Affiliations
a, Fluxim AG, 8400 Winterthur, Switzerland
b, Institute of Computational Physics, Zurich University of Applied Sciences, Winterthur, Switzerland, Gertrudstrasse, 15, Winterthur, CH
Abstract

Perovskite is well known for its composition tunability allowing bandgap optimization according to the application requirements. Composition and cations stoichiometries have an impact on the type and concentration of ionic charge carriers as well as on performance stability under continuous stressing conditions.

First, we will analyze the intrinsic instability of Methylammonium lead iodide (MAPbI3) based films under constant illumination. The analysis shows that the film transmittance increases (“bleaching”) within the first few hours but then saturates. The photoluminescence signal shows an initial increase – linked to the transmission – before it decreases. Interestingly, the speed and amount of the bleaching depend on the hole-transport layer and potential post-treatment steps.

We then proceed with investigations on the characteristics of FA-based perovskite solar cells with non-stochiometric compositions. A FA excess of 1-1.5% leads to improved stabilized device performance and higher ionic conductivity as measured with electrical impedance spectroscopy. According to simulations of IV and impedance data, carried out with the simulation software Setfos, it appears that increased conductivity correlates with an increase in the density of ions rather than mobility.[1]

Finally, we compare the performance under continuous stressing conditions of high bandgap MA- and FA-based PSCs, which are suitable candidates as sub-cells for tandem solar cell technologies. In this study, we tested encapsulated PSCs of various compositions with bandgaps higher than 1.57eV and an efficiency of up to 20%. The stressing experiments were carried out at different temperatures from 25°C up to 85°C, at MPP conditions with equivalent AM1.5G illumination (ISOS-L1 conditions) using the benchtop instrument Litos. Additionally, by performing in-situ JV scans every 60 minutes, we could follow the evolution of the PV parameters in parallel with stressing. The decay of the MPP correlates with the short-circuit current decay, thus indicating the development of charge generation and collection issues with aging. We performed additional characterization techniques before and after the stressing experiments using the Paios measurement platform to gain further insight into the degradation mechanisms.

16:30 - 16:45
Discussion
16:45 - 17:15
Panel Discussion “The future of perovskite solar cell stability in real-world conditions”
17:15 - 17:30
Closing
17:30 - 18:30
Ápero
 
Posters

Time Converter

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info