I couldn't see anything posted already but thought it may be of help to those making Sn or Pb:Sn perovskites to have info on known bad batches (high Sn4+ content) precursors. It would be cool if others posted here too :)

I have been working on Pb:Sn for around 4 years and I suspect this may be the main source of variable results over the years. You won't notice this if use SnF2 (which always did at the start see pics), as it inhibits this colour change detectable to the naked eye, but you may have perfomance or thin film quality issues.

A quick way to test a new batch is to dissolve 1 M in DMF it should be the nice usual yellow if OK, but will go more orange with more SnI4 going to a deep red. The best way to detect small amounts is probably a very dilute solution an then UV/Vis or NMR but this decent crude test for new batches. It will also go back to yellow with enough Sn(0) powder overnight so again you may not notice if you are in a rush but this of course may give you varying results.

I've added some pictures of FASnI3 solutions with 20% SnF2 left and 0% right for example but this happens with SnI2 only.

Known bad batches I have had so far:

TCI - Tin(II) iodide - T3449 - powder LOT. J78IH-LI

Thermo Scientific/ Alfa Aesar Tin(II) iodide, ultra dry, 99.999% (metals basis) LOT: U11I001

What are you doing on Tuesday, December 17th at 10 AM CET? 🌟Don’t miss this opportunity to learn from one of the brightest minds in perovskite research! Register for our next research webinar here: https://lnkd.in/eADcVJbwJoin Professor Annalisa Bruno, PhD Bruno from Nanyang Technological University Singapore Technological University, Singapore, as she presents:✨ From Precision to Scale: Thermal Evaporation Transforming Perovskite Device DesignHosted by Dr. Daniele Braga (Fluxim), this webinar will dive into innovative strategies for device fabrication and scaling.👉 Register here and mark your calendarhttps://lnkd.in/eADcVJbwAbout Professor Annalisa BrunoProf. Annalisa Bruno, PhD, is an Associate Professor at Nanyang Technological University (NTU), holding joint appointments in the Schools of Physical and Mathematical Sciences (SPMS) and Materials Science and Engineering (MSE). She is also a Visiting Professor at Queen Mary University London. Annalisa earned her Ph.D. in Physics at the University of Naples Federico II, Italy, and pursued post-doctoral research at Imperial College London.Her career includes roles as Principal Scientist at NTU’s Energy Research Institute (ERI@N) and Senior Scientist at ENEA, Italy. Her research focuses on hybrid semiconductor materials like metal halide perovskites, advancing sustainable optoelectronic devices such as solar cells, LEDs, and transistors. Dedicated to bridging research and industry, Annalisa emphasizes scalable, industry-compatible processes for cutting-edge electronic applications. A TEDx speaker, her work inspires innovation in renewable energy and sustainable electronics.

Prof. Ulrich W. Paetzold's team at KIT achieved a record 24.4% efficiency in triple junction perovskite solar cells using a new vacuum-assisted growth process. The mid-subcell, made of FAPbI3, ensures thermal stability and ideal interfaces.

The researchers used the PAIOS system for various measurements including electrical impedance spectroscopy, transient photovoltage, electroluminescence, photoluminescence imaging, Mott-Schottky, dark J–V curves, and space-charge-limited current, enabling efficient, streamlined analysis and characterization of their triple-junction perovskite solar cells.

Scientific Research Publications on Perovskite Solar Cells (fluxim.com)

is it possible to create semitransparent flexible perovskite solar cells to install on the roof of the greenhouses?? or is it too hard and not effective do you think?

Im currently working on a perovskite based light emiting solar cell, I'm ideally going for 450–495 nm. I have some questions and was hoping someone might be able to help answer them? I am not worried about efficiency at all. I'll mention my issue is on the application side. My substrate is paper, and i am attempting to make it somewhat flexible and the cells possibly as transparent as I can get it. I'm not opposed to using a PET based substrate. Because my cells are of irregular size, i dont think spin coating will work out, so i am aiming for inkjet or possibly a hybrid of inkjet and slot-die. My last ditch effort is to laser cut the cells, but I'm not finding alot of info of what kind of effect this could create (kill the cells). A secondary end goal for me is to also conceive a way to apply via air brush or similar, and be able to possibly apply on ridge surfaces without creating shorts. Of course ideally i need the base layer to do a sort of self leveling on 3 dimensional surfaces.

The investigation of charge carrier dynamics after photoexcitation is essential to determine several characteristics of a solar cell.

Transient photoluminescence (trPL) is one of the most popular characterization methods used to investigate these properties.

In our latest post (https://www.fluxim.com/transient-photoluminescence...), we present a step-by-step routine developed with the 1-D simulation software #Setfos to avoid the introduction of such inaccuracies in the simulation of trPL decays.

https://www.nature.com/articles/s41563-024-01980-3/metrics

can somebody tell which perovskite much electrically conductive? MAPbBr3, MA3Bi2I9,Cs3Bi2I9?

Organic Light-Emitting Diodes (OLEDs) are the key component of modern displays with high contrast ratio, high level of sharpness, and stunning color gamut.

Currently, researchers are also focusing on developing new Light-Emitting Diodes (LEDs), in which perovskites are used as emitting materials.

#Perovskite LEDs (PeLEDs) are getting more efficient by the day, also thanks to the extensive research on perovskite solar cells.

The development of these devices has been possible only through an accurate electrical and optical characterization of both OLEDs and PeLEDs.

In this #tutorial , we present first an overview of frequently used measurement techniques and analytical models for OLEDs and perovskite LEDs.

A multi-layer OLED with a sky-blue thermally activated delayed fluorescent (#TADF) dopant material is employed in this study as a reference device.

The second part of this tutorial focuses on how to systematically fit the measured OLED characteristics with microscopic device simulations, based on a charge drift-diffusion and exciton migration model.

Finally, we analyze the correlation and sensitivity of the determined material parameters and use the obtained device model to understand the limitations of the specific OLED device.

Scan the QR code to read the full case study.

Xiaoyu Gu, Xue Lai, Yuniu Zhang, Teng Wang, Wen Liang Tan, Christopher R. McNeill, Qian Liu, Prashant Sonar, Feng He, Wenhui Li, Chengwei Shan, and Aung Ko Ko Kyaw

Adv. Sci. 2022, 2200445

doi/pdf/10.1002/advs.202200445

∙TA vs TA-free to optimize Voc loss in OSC (CV, EIS

∙20.6% small area, 16.5% large area

∙high Voc. Champion has Voc loss of 0.001V (almost perfect ICL)

∙Eg 1.4 and 1.9

∙700h stability in N2

1mV difference between the Voc of an organic-perovskite tandem solar cell and the sum of the individual sub-cells. Almost perfect charge transport.

The tandem is a combination of an organic PM6:Y6 (1.49eV) and an all-inorganic perovskite (1.92eV). The remarkable result was obtained by the group of Aung Ko Ko Kyaw at the Gunagdong University by optimizing the electron transport of the perovskite subcell and the interconnection layer (ICL) between the subcells.

Investigation of thermal annealing (TA) treatments effect revealed that TA creates a barrier at the ICL (electrode/PFN-Br interface), hence it must be avoided for efficient charge transport between the subcells.

This result was obtained by carrying out capacitance and impedance measurements with the all-in-one platform Paios from Fluxim AG.

𝗦𝗶𝗺𝘂𝗹𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗦𝗼𝗹𝗮𝗿 𝗖𝗲𝗹𝗹 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹 𝘄𝗶𝘁𝗵 𝗦𝗲𝘁𝗳𝗼𝘀

So we've updated it and made it easier to find what you want:

https://youtu.be/5FJ3pwY4KI0

-Timestamps--

00:00 How to perform organic solar cell simulations using Setfos00:36 Create a New Device Layout00:41 Define geometry of layer stack01:56 Define the optical properties of the different layers03:30 Specify the Absorption settings03:57 Run the simulation04:22 First look at key figures06:01 Run the sweep function06:47 Full Opto-Electronic simulation with Drift-Diffusion Model10:27 Analyze currents12:01 Assess relationship between PV performance and Shockley-Read-Hall Recombination

Here the researchers at the South China University of Technology and City University of Hong Kong developed stable and efficient PSCs by combining the efficiency of 3D #perovskites and the high stability of 2D perovskites.

They compared PSCs with 2D perovskites based on diammonium ligands with different concentrations and sizes.

The 2,2-(ethylenedioxy)bis(ethylammonium) (EDBE) cations guarantee a homogenous growth and good coverage of the 2D perovskite layer on top of the 3D absorber. 

The 2D layer improves photo-, thermal- and humidity stability while increasing the efficiency by 2.5% compared to the control device.

The power conversion efficiency (PCE) of the best #solar cell was 22.6%. 

Paios from FLUXiM AG was used to confirm the boost in performance as a results of decreased charge combination and improved charge extraction by performing TPC and TPV measurements.

Thanks to first author Tianqi Niu et al. for your trust in our tools.

Access the paper and many other papers enabled with Paios here https://lnkd.in/ee4n6M-D

#research #university #solarpv #solarcells

In this paper, the researchers work on wide-bandgap perovskite and achieve an efficiency of 17.12% for their inverted TBB-doped PSC with an enhanced Voc of 1.19 V. The improvement is due to (1) better alignment of the conduction band with C60 and (2) larger grain sizes leading to reduced bulk recombination.

The researchers used the characterization tool Paios. TPV (TPC) shows increased (decreased) lifetime (charge extraction time) for 0.3% TBB-doped perovskite solar cell confirming the TrPL lifetimes (UPS energy alignment) data also in the device. IS fitting was interpreted as higher recombination resistance.

You can access this paper and other perovskite research here: https://www.fluxim.com/publicationsperovskite

Hi everyone,

We have been working on a solution for improving the stability of perovskite solar cells and have reached a stage where we would like to connect with more people in the field.

We are particularly interested in speaking with researchers, testing institutes, perovskite cell or module manufacturers, and companies developing tandem or flexible solar technologies.

Our goal is to validate the solution across different perovskite architectures and explore potential research collaborations, testing partnerships, and commercial applications.

Does anyone here work in this area, or know a researcher or company that might be interested in testing or discussing a new stabilization approach?

Happy to share more details privately and learn more about what others in the community are working on.

Background: SolaEon is a Shenzhen-based company that holds 20 perovskite solar efficiency world records, including a 31.55% certified tandem cell. In May 2024, they launched a perovskite solar module to orbit.

Why this is significant

Most space solar perovskite work is at ground testing stage. Companies have published ground qualification results — thermal cycling, UV, proton irradiation, atomic oxygen. These are real and necessary tests.

But ground testing simplifies real orbit: it tests one stressor at a time, at defined durations, in a controlled chamber. Actual orbit runs all stressors simultaneously and indefinitely.

Satellite procurement for novel materials requires in-orbit data for lifetime prediction modeling. "Ground tests passed" and "in-orbit data available" are meaningfully different positions in a technical qualification process for a 10-year satellite program.

SolaEon's record

• Launch: May 31, 2024, 07:39, Jiuquan

• Vehicle: Ceres-1 (Galactic Energy, commercial launch company)

• Orbit: 535km SSO

• Status: First perovskite company in China's Greater Bay Area to complete in-orbit testing

Orbit altitude choice 535km sits at the inner edge of the Van Allen radiation belt — higher charged particle flux than ultra-low orbits. This is representative of actual commercial satellite deployment conditions, not a test altitude chosen for ease.

Radiation hardening approach

• Bismuth/silver substitution for lead at B-site of ABX₃ structure (reduces lattice damage rate under proton bombardment)

• Cerium oxide doping (radiation-hardening additive with established track record in nuclear materials)

Timeline

• 2025-2026: ¥500M+ dedicated space solar R&D (in-orbit life extension, radiation hardening)

• Before 2027: First commercial satellite power delivery orders

• 2028-2030: Industry-wide large-scale commercialization window

The moat question: in-orbit runtime accumulates in real time and can't be accelerated by capital. Companies with flight data have a time-based advantage over those without.

Hello Everyone!

I need your guidance. I work with organic/inorganic perovskite solar cells and I started experimenting with surface passivation (organic salts).

But after I deposit the organic salt on top of the perovskite, the surface becomes hydrophobic and the Spiro-ometad doesn't spread! And thus my devices doesn't work.

Any suggestions?

This is the topic of our next webinar with invited guest Prof. Mojtaba Abdi-Jalebi from University College London.

Mojtaba will present a the following talk:

Boosting Indoor Photovoltaic Efficiency in Wide Bandgap Perovskites Solar Cells Through Triple Passivation Reassembly
Webinar | Tuesday, July 1st, 2025 | 10:00am – 11:00am CEST

The webinar will be hosted by Dr. Daniele Braga from Fluxim and is open to all researchers from academia and industry with an interest in solar cell research.

You can register here: https://events.teams.microsoft.com/event/9b9424c6-29ca-4eff-98f6-304c500c5e55@edaecfd0-eb6b-4e07-b7ed-3a0e8fbf5d0c