Christian Wolff

Power conversion efficiency of tandem devices fabricated in the presented study versus device area. The 1cm2 device has over 31%, the 4cm2 device over 30% and the 60 cm2 device 28.9%. On top are photographs of the mentioned devices.

Kerem pushed the limit of perovskite/silicon tandem solar cells once more!

www.nature.com/articles/s41...

wafer-scale homogeneous passivation enabled 60cm2 tandem devices with 29% efficiency! #tandem #solar #pv #perovskite

Schick Mir ne DM

Finde dein Projekt toll. Könntest du vielleicht die Wishlist auf eine EU-basierte Platform verschieben?

What we show is that simple, easily accessible robots (eg, refurbished 3D printers or hobby robots) are able to automate many tasks and get data in an automated reliable way for research labs spanning to industry. Fast feedback on your ideas accelerates any development.
make your own!

Thinking beyond, this shows what is possible outside of semiconductors. One could easily extend these systems to solution-processed multilayers for Bragg filters/reflectors, but also other processed films for a number of applications such as batteries, and others with ease.

We showcase it with perovskites, but it doesn’t stop there. The solution processing add-on ROSIE adds the ability to make thin films ( any really) in an automated fashion, drop-casting at the moment, spin coating coming up next.

Accelerating optimization of halide perovskites: two blueprints for automation The fine-tuning of halide perovskite materials for both performance and stability calls for innovative tools that streamline high-throughput experimentation. Here, we present two complementary systems...

Incredibly proud of this and of your work, in all, Hilal Aybike Can. Any semiconductor meant for absorbing light can be tested this way in an accelerated fashion - rebuilt and adapt! pubs.rsc.org/en/content/a...

Aber, vielleicht lösen wir erstmal die akuteren Probleme auf unserem Planenten, da ist solare Energieumwandlung sicherlich eine der besten Optionen.

Man muss sich in diesem Fall den Gegebenheiten optimal anpassen. In Anbetracht der halbwegs realistischen Zeitlinien zur punktuellen Besiedlung des Marses ist es nicht unbedingt sinnvoll Atomkraft komplett abzulehnen. Rückschlüsse auf die Erde sind natürlich Quatsch. Differenzierung schadet niemand

Auf dem Mond macht solare Energieumwandlung Sinn, auf dem Mars wird’s schon schwieriger. Atomkraft sollte nicht generell abgelehnt werden. Diese ist nützlich für Situationen wo Sicherheit kein Problem ist (zb weit weg von allem Lebenden, also zb auf dem Mars mittelfristig).

Sehr coole Aktion. Vielleicht macht ja der ein oder andere noch mit.

www.climatehub.earth/balkonien

Auf der Teetasse, damit der beim ziehen nicht so schnell abkühlt und danach den Teebeutel auffängt wenn man schon in der Decke eingemummelt ist und nicht mehr aufstehen mag.

YouTube video by HÜBNER Photonics Femtosecond Physics Fundamentals

www.youtube.com/watch?v=_oTW...

Ultrakurze Erklärung, pun intended

Das mit der Attosekunde, der Dauer eines Herzschlags und dem Alter des Universums kommt grob hin, ja. 10^-18s, 10^0s, 4 x 10^17s. Ich weiß nicht ob das hilft, ich kann mit dem Alter des Universums intuitiv nichts anfangen, aber gut.

Femtosekundenlaser sind inzwischen fast schon „Standard“, man kann sehr gute Systeme mit ~ 10fs kommerziell erstehen, wenn auch nicht immer günstig. Darunter, im Attosekundenbereich, kommt man an die Limits was gerade machbar ist. Zurecht vorletztes Jahr mit dem Nobelpreis ausgezeichnet.

Ok, danke für die Antwort!

Bin kein Fan der rassistisch anmaßenden Maßnahmen, dennoch: wie schätzen sie dann die Genauigkeit von Gentests wie MyHeritage etc. ein ? Die liefern meiner persönlichen Erfahrung nach tatsächlich sehr akkurate Ergebnisse. Natürlich auf ner anderen Längenskala als für Strafverfolgung nötig, dennoch?

a beautiful example of applied Le Chatelier principle. @austinkuba.bsky.social - based on prelim. work by F. Sahli - inverted the degradation of FAI by increasing the concentration of the degradation products and added a therm. gradient favouring formation & condensation over degradation & effusion.

Making from Breaking: Degradation Inversion Enables Vapor-Phase Synthesis of Halide Perovskites in Ambient Conditions Vapor phase deposition of formamidinium-rich perovskites is hampered by the decomposition of formamidine in the vapor phase. We use the reversibility of this reaction to establish a dynamic equilibriu...

New paper!

pubs.acs.org/doi/10.1021/...

Vapor processing of FA based perovskites is tricky. Material usage/accessible deposition rates can be low because of degradation reactions in the vapor phase, and high vacuum or close space is usually required.

Bitte Teilen und weiter Sagen:
Bitte helft mit! 🙏
Ich brauche dringend Laptops, um weiterhin Menschen unterstützen zu können.
Voraussetzungen: ab Windows 7, mindestens 4 GB RAM.
Mit oder ohne Festplatte – aber unbedingt mit Netzteil!
Jeder Laptop schenkt Zukunft. 💻❤️
➡️ www.pc-spenden.de

This results in improved optoelectronic performance of the solar cells, and more importantly is a markedly enhanced stability when operated at 65°C over thousands of hours.

Mostafa then came up with a way to drastically reduce the likelihood of these defects by manipulating the growth of the crystals preferentially along crystal planes that are much less likely to form stacking faults.

By locally looking at the diffraction of these defective regions we could link the formation of these stacking faults to a specific crystal growth direction.

Suppression of Stacking Faults for Stable Formamidinium‐Rich Perovskite Absorbers The authors show that the (011)C perovskite planes are prone to stacking faults formation in all leading formamidinium-rich perovskite compositions. Using ethylene thiourea as a precursor additive, O...

PAPER ALERT:
Mostafa's 2nd big paper is finally out in Adv. Mat. :

advanced.onlinelibrary.wiley.com/doi/10.1002/...

We started out by looking at an aged perovskite film under the TEM and observed that the films start degrading from specific regions which we identified then as stacking faults.

Ich lebe seit einigen Jahren in der Schweiz. Wehrdienstmodell: Man wird vom Beruf zeitweise freigestellt, inkl. Lohnausgleich (80%). Klappt recht problemlos, aber muss sich ein Staat leisten wollen. Einmalig 18 Wochen und dann 19 Tage jedes Jahr zwischen dem 18. und 30. Lebensjahr.

Template‐Assisted Growth of CsxFA1‐xPbI3 with Pulsed Laser Deposition for Single Junction Perovskite Solar Cells Template-assisted pulsed laser deposition (PLD) enables the growth of phase-pure α-CsxFA1-xPbI3 perovskite films. Stoichiometric transfer and uniform coverage on planar and textured substrates is dem...

In our latests work we show template-assisted PLD growth of CsxFA1-xPbI3 films: compositional control and phase-pure growth on planar and textured substrates 🔬. @kraljs.bsky.social and collaborators at EPFL (@pero-pal.bsky.social), EMPA and AMOLF advanced.onlinelibrary.wiley.com/doi/10.1002/...

The Inspiration to Look at encapsulated devices, too, came from Uli Pätzold‘s Team @kit.edu : doi.org/10.1364/OE.4...

Five Failures in the Oval Office (video) America hurt itself badly today.

Here I react to the shameful encounter between American leaders and media and the Ukrainian president. No doubt there were more, but I saw five failures on our side: of hospitality, decency, democracy, strategy, and independence. Please watch and share.
snyder.substack.com/p/five-failu...

Beyond Flat: Undulated Perovskite Solar Cells on Microscale Si Pyramids by Solution Processing Microscale pyramids of silicon solar cells are often considered incompatible with solution-processed perovskite films. Thus, solution processing has mainly been used with submicron pyramids that are buried under thick perovskite films with flattened front surfaces. Yet, while this modification simplifies the fabrication process, it compromises optical performance compared to conformal perovskite films (e.g., obtained by vapor processing). Here, we show that protrusion-free perovskite films can be formed on random pyramids much higher than the film thickness by tailoring the film thickness to match the pyramids’ height profile, notably without modifying the pyramid facets. Accordingly, we demonstrate perovskite cells spin-coated on over 2 μm-high random pyramids with electronic performance comparable to those fabricated on flat substrates, and proof-of-concept perovskite-silicon tandem devices with efficiencies reaching 33%. Finally, we show that the undulated films with enhanced conformality enable optical performance superior to flat surfaces, especially upon encapsulation, most relevant to outdoor applications.

Hi,
I'm new to BSK. A good place to start: new publication from my team:

Si solar cells with micro-pyramids are considered not compatible with solution-proc. perovskite films—but are they? We show films coated onto >2 μm pyramids with optical benefits beyond flat.

pubs.acs.org/doi/10.1021/...

PhD Studentship in Development of Low-Light and Ambient Photovoltaic Devices for IoT Applications at Newcastle University on FindAPhD.com PhD Project - PhD Studentship in Development of Low-Light and Ambient Photovoltaic Devices for IoT Applications at Newcastle University, listed on FindAPhD.com

🌟New #PhDposition @NewcastleUni! Join us in developing innovative low-light photovoltaic devices for IoT applications. Working with amazing colleagues including @lucywhalley.bsky.social on next-gen PV.
Apply/Share: www.findaphd.com/phds/project...

#AcademicTwitter #STEM #Sustainability #AI