Pavel Troshin

Skolkovo Institute of Science and

Technology, Skoltech, RU

Eugene Katz

Ben-Gurion University of the Negev, IL

Symposium 1
Techniques to analyze stability 
June 2nd 
Chairperson:  Pavel Troshin
Invited Speakers

Jovana Milic
Ecole Polytechnique Federale 
de Lausanne (EPFL), CH

Emilio J. Juarez-Perez
ARAID Foundation, ES

Antonio Guerrero
Universitat Jaume I, 
Institute of Advanced Materials (INAM), ES

Symposium 2
Testing operational stability 
June 3rd
Chairperson: Eugene Katz
Invited Speakers

Morten Madsen
University of Southern Denmark, DK

Rongrong Cheacharoen
Chulalongkorn University, TH

Alessio Gagliardi
Technische Universitaet Muenchen, DE

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The Online Meetup Methods to analyze stability of perovskite-type absorbers and solar cells took place on Tuesday 2nd and Wednesday 2020.

Contents

Perovskite solar cells demonstrated impressive power conversion efficiencies exceeding 25%, while their practical application is still significantly impeded by poor operation stability. This online conference is aimed to promote discussion and exchange of knowledge on the methods and techniques used to analyze and characterize different types of degradation effects in perovskite films and solar cells.

During the first day, we focused on advanced approaches for designing absorber materials with improved stability and methodology to study their aging under the action of elevated temperatures, light and/or electric field. In addition, environmental degradation such as oxidation, hydrolysis and other atmosphere-dependent effects will be considered. In a broader context, we will discuss interface degradation effects occurring at grain boundaries and between the device functional layers (HTL, ETL, absorber, contacts) induced by certain stress factors or their combinations. Special attention will be paid to the advanced strategies of material design and characterization for reaching improved operational stability of perovskite solar cells. Is the interface passivation the key component to enable commercially interesting perovskite PV lifetimes?

During the second day of the conference, we discussed the studies of operational stability of perovskite solar cells. We will mostly focus on the experimental procedures that can account for properties specific to perovskite solar cells (such as ion redistribution under electric fields, bias-dependent degradation, reversible character of degradation, challenges of device encapsulation, etc) and to distinguish ambient-induced degradation from other stress factors. Unlike efficiency measurements, stability experiments might take very diverse forms and have a broad range of parameters to take care of. This makes it difficult to reproduce and compare the results between different groups. Unified procedures for stability studies and consistency in data reporting could lead to the creation of a large machine-readable database on perovskite photovoltaic stability. One the lectures will be specifically devoted to machine learning (ML) methods that could potentially identify patterns in the degradation experimental data, detect statistically significant stress factors, correlate repeated phenomena in different studies to detect universal degradation mechanisms and stabilizing approaches, and predict lifetimes and failure modes.

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Symposium 1 - Techniques to analyze stability - June 2nd 

• Material design for improved stability
• Material aging induced by heat stress
• Degradation induced by light
• Electric field induced degradation effects
• Effects of moisture
• Effects of oxygen
• Other atmospheric effects
• Radiation-induced degradation 

Symposium 2 - Testing operational stability  - June 3rd

• Bias-dependent dynamics of degradation and restoration of perovskite solar cells
• Towards 25-year lifetime of perovskite photovoltaics: Studies and optimization of the device encapsulation
• Machine-Learning based screening of mixed lead-free double-perovskites solar cells