Thanks to Prof. David Griffith for the invitation to give a talk at Willamette University today. I presented James’ and Michael’s work on perovskite NCs and got a ton of excellent questions from the students at Willamette. I hope we soon see some of those students at UO as graduate students!

Many thanks to Prof. Clemens Burda for hosting my seminar visit to Case today. It was great to chat with him and his awesome team of graduate students about their recent work, and meet some of the great faculty at Case. Thanks for the fun visit!

Many thanks to Stephanie Lee and Takuji Adachi for the invitation to speak at this year’s APS meeting and for organizing a stimulating session on organic electronics. It was the first time we’ve presented Zach’s new SSTA measurements, collected in situ during polymer annealing! Great work, Zach!

Thanks to Prof. Pat Kambhampati for hosting a fantastic virtual visit to McGill University in Montreal. Many stimulating conversations with faculty there who are doing quite amazing work!

A big thank you to my host, Prof. Karl Jobst, for inviting me to present a seminar in the Chemistry Department at Memorial University. It was a great opportunity to share our work!

A huge congratulations to Dr Morgan Sosa on becoming a Dr this morning! Morgan did an excellent job in defending her dissertation, titled “Modeling the Evolving Mixture of H- and J-Aggregates During Organic Film Formation”. Morgan’s work in using the two-particle approximation to rapidly simulate and fit the absorption spectra of an organic molecule is a big step forward in our understanding of how a heterogeneous mixture of aggregates can form during the casting of a thin-film. Morgan drew a huge crowd of supporters and well-wishers. We will miss you both in our research group and more broadly in the UO community, Morgan! Congrats!

A huge congratulations to Michael and James on their paper, “Ligand-engineered bandgap stability in mixed-halide perovskite LEDs”, which was published today in Nature. A mixture of halides can be used in perovskite NCs to tune their emission wavelength, but upon exposure to light or electrical bias these halides tend to segregate, changing their emission wavelength. Our collaborators at Oxford developed a method using short-chain, multi-dentate ligands to stabilize the surface of perovskite NCs, and we, along with collaborators in Korea, demonstrated that the use of these ligands inhibits halide-segregation. Michael performed incredibly difficult transient absorption measurements on the nanocrystals, trapping them in their segregated state to measure their excited state dynamics and demonstrate the inhibition of segregation upon exposure to light. James and Michael also used dilution studies to show that the mechanism of halide segregation is likely within single nanocrystals. James patiently and carefully wrote and revised large portions of this paper and I hope he and Michael enjoy seeing the culmination of their years of hard work in print at last! Many thanks to all of our collaborators, particularly Yasser Hassan and Henry Snaith for inviting us to be a part of this fruitful collaboration.

In Kelly and Zach’s invited paper in Spectrochim Acta A, we review the different methodologies used to implement single-shot transient absorption spectroscopy, and review design principles for these instruments. It was fun to write this final paper with Kelly as he left for his next position. Great job, all!

Thanks to Prof. Tiglet Besera for the invitation to virtually visit Missouri State University’s Physics Department for a seminar. It was great to have a chance to share our work with their faculty and students.

Zach did a masterful job of presenting his research during his qualifying exam, passing with flying colors. All the studying paid off! Great job, Zach, and to the entire group for helping him prepare – go team!