PhD-Postdoc series

The PhD-Postdoc series will be back after the summer break!

The Next Generation Solar Energy (NGSE) PhD-Postdoc series aims to promote the work of emerging scientists in the field of solar energy. Whereas many talks at mainstream conferences are given by experienced professors and group leaders, here only early career researchers will be given a stage to promote a new generation of promising scientists.
Group leaders and professors are more than welcome to attend the talks and ask questions to the speaker. In this fashion, the series will provide a platform for experienced scientists to give feedback and challenge the young generation, but also to scout for future potential collaborators and colleagues.
This series aims to facilitate discussions and to allow for deeper insights into phenomena as well as characterization techniques. As such, presentations will focus on clearly defined topics covered in-depth, rather than a list of big achievements.
The series is organized by a committee of early career researchers.

Presentations will be around 30 minutes with copious time for questions. The series runs online via Zoom on the second and fourth Wednesday of every month. Sessions start at 5 PM Berlin time (GMT+2), which, depending on your location, translates, into 8 AM Los Angeles (GMT-7), 11 AM Montreal (GMT-4) or 11 PM (GMT+8) Beijing.

With the speakers’ permission (embargo period possible) the talks will be recorded and uploaded to the NGSE YouTube channel.

We look forward to welcoming all of you to these events,

Dr. V.M. Le Corre | Dr. Simon Kahmann


The registration to attend the NGSE – PhD-Postdoc series is free of charge!

To register in advance please follow the links below:

Click here to register for the second Wednesday of the month’s talks

Click here to register for the fourth Wednesday of the month’s talks

Note that if you register once for either of the meetings you will not have to register again.

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22-May-2024 – Bowen Yang:

Multifunctional sulfonium-based treatment for durable perovskite solar cells

Both performance loss and degradation of perovskite solar cells (PSCs) are initiated at grain boundaries (GBs) and interfaces, where defects and mobile ions tend to accumulate under external stress, such as continuous illumination, humid environment, and elevated temperature. Therefore, suppressing surface defects along with inhibiting mobile ion migration is critical to achieve PSCs long term stability. Different molecular species have been explored to suppress defect formation and ion migration either in the perovskite bulk or at the adjacent interfaces, with the ultimate goal of achieving stable PSCs. These species include ammonium-based salts, small organic molecules, polymers and other passivation agents including inorganic salts. A new category of aprotic sulfonium-based molecules shows great potential in stabilizing PSCs, however, it remains largely unexplored.
In this work, we innovated a sulfonium-based molecule to post-treat formamidinium lead iodide perovskite films, which shows outstanding stability upon light soaking and remarkably remains in black-phase after 2 years ageing under ambient condition without encapsulation. The DMPESI-treated PSCs deliver a breakthrough record in operational stability of highly-efficient PSCs with less than 1% performance loss after more than 4500 h at maximum power point tracking, yielding a theoretical T80 of over 9 years under continuous 1-sun illumination. They also present less than 5% PCE drops under various ageing conditions.


Date:Speaker:Title & Abstract:Link:
27-Sep-2023Pilar López Varo
– Institut Photovoltaïque d’Île-de-France (FR)
Ion Migration in Perovskite Solar Cells in X-Ray Photoemission SpectroscopyLink
11-Oct-2023Esma Ugur
Overcoming the challenges of the perovskite-based tandem solar cells: A spectroscopy perspectiveLink
25-Oct-2023Luke Sutherland
– Monash University, Aus
Carbon Electrodes for Highly Efficient Small, Large, Rigid, and Flexible Perovskite Solar CellsLink
8-Nov-2023Julien F. Gorenflot
Transient absorption spectroscopy on organic photovoltaic materials: Why? How? And what?Link
22-Nov-2023Mariam Ahmad
– University of Southern Denmark, DK
Unveiling the electronic State interplay at TiOx/ITIC Electron transport layer/non-fullerene acceptor interfaces in highly efficient organic photovoltaicsLink
24-Jan-2024Lennart Reb
– Technical University of Munich, DE
Next-Generation Solar Cells for Space Applications – Space Characterization and X-Ray Studies on Perovskite and Organic Solar CellsLink
14-Feb-2024Zijian Peng
– Friedrich-Alexander-Universität Erlangen-Nürnberg, DE
Understanding How 2D/3D Interfaces Deteriorate the Long-Term Stability of Perovskite Solar Cells under 85°C and Light-SoakingLink
28-Feb-2024David Garcia Romero
– University of Groningen, NL
Tin Oxide for High-Performance and Stable Organic Solar CellsLink
13-Mar-2024Hannes Hempel
– Helmholtz-Zentrum Berlin, DE
Transient Photoluminescence of Lead Halide Perovskites Beyond LifetimesLink
27-Mar-2024Abigail Hering
– UC Davis, US
High-throughput characterization and machine-learning assisted analysis of halide perovskite stabilityLink
10-Apr-2024Arianna Quesada Ramirez
Ellipsometric measurements in organic semiconducting materials for photovoltaicsLink
24-Apr-2024No Talk
08-May-2024Kyle Frohna
– Stanford University, US
Multimodal Microscopic Characterisation of Halide PerovskitesLink
22-May-2024Bowen Yang
– Uppsala University
Multifunctional sulfonium-based treatment for durable perovskite solar cellsLink

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