PhD-Postdoc series

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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Next Talk 28-Feb-2024 – David Garcia Romero:

SnO2 for High-Performance and Stable Organic Solar Cells

In organic solar cells, the interface between the photoactive layer and the transport layers influences severely the device performance and stability. In particular, when solution-processed metal oxides are employed as the electron transport layer (ETL), such as SnO2, the presence of surface defects can downgrade the charge extraction, and it is essential to understand their origin.
Herein, we show that a well-reported and commercially available colloidal SnO2 dispersion leads to a suboptimal interface with the organic layer, as evidenced by the s-shaped J-V curves and poor device stability. In my talk, I will show two solutions we propose to make SnO2 a suitable ETL:
Firstly, by diving into the surface chemistry of the nanoparticles, we identify potassium ions as stabilizing ligands. By removing them with a simple method, we remove the s-shape and improve short-circuit current. We increase the efficiency of two typical blends: from 11.06% to 12.82% for TPD-3F:IT-4F, and from 15.17% to 16.26% for PM6:L8:BO. More strikingly, the ion removal boosts the stability up to 87% of initial efficiency after 100h of illumination.
Secondly, we have employed an alternative method to deposit SnO2 by atomic layer deposition (ALD). ALD is an industrial grade technique, suitable at the wafer level and also in a roll-to-roll configuration. The superior interface quality obtained with ALD lead to efficiencies as high as 17.26%, thanks to a reduced interfacial charge carrier recombination.



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

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