Michael Nielsen
@lasermike.bsky.social
Canadian undertaking spectroscopy and optoelectronics research Down Under. Senior Lecturer and Scientia Fellow at SPREE, UNSW Sydney https://www.aos-nielsen-group.com/
Ever wondered how X-ray diffraction works? Now you are able to visualise it in 3D in your web browser for any crystal structure of your choice. Run it: dubajicmilos.github.io/assets/diffr... The full tutorial video: www.youtube.com/watch?v=wYKH... The source code: github.com/dubajicmilos...
Structural exciton localization drives efficient solid-state sensitized triplet fusion upconversion www.nature.com/articles/s41...
Structural exciton localization drives efficient solid-state sensitized triplet fusion upconversion - Nature Photonics
An absolute photon upconversion efficiency of 8.2% is demonstrated using a liquid triplet fusion medium that behaves as solid on excitonic timescales. The findings may drive higher efficiencies in nan...
nature.com
Have you ever wanted to send someone a message but didnt want an observer seeing you do it? Introducing thermoradiative signatureless communications (now published in LSA), an offshoot of our work on negative luminescence for night-time solar applications. www.nature.com/articles/s41...
Balancing positive and negative luminescence for thermoradiative signatureless communications - Light: Science & Applications
We demonstrate covert transmission of data by rapidly modulating mid-infrared photodiodes, balancing forward and reverse bias luminescence. Only fast detectors resolve the signal; slow observers obser...
nature.com
Very excited for our new paper to come out in ACS Nano where we investigate room-temperature magneto-photoluminescence in 2D perovskite nanosheets! doi.org/10.1021/acsn...
Between the Nanosheets: Enhancing Electron–Hole Exchange Interaction for Room-Temperature Magneto-Photoluminescence in Liquid-phase-exfoliated 2D Perovskite
Nanomaterials with a strong room-temperature optical response to magnetic fields are highly desirable for applications in sensing and photonics. Therefore, the ability to tune this response presents a...
doi.org
Latest work from @schmidtim.bsky.social Tayebjee and collaborators Singlet Fission c-Si Solar Cells: Beyond Tetracene | ACS Energy Letters pubs.acs.org/doi/10.1021/...
Singlet Fission c-Si Solar Cells: Beyond Tetracene
Singlet fission photovoltaics enable the extraction of two electron–hole pairs from each higher-energy photon while leveraging a mature technology such as crystalline silicon (c-Si) as the underlying cell. Significant steps have been made in the development of singlet fission silicon photovoltaics, but all examples reported to date use tetracene as the singlet fission material. Tetracene is photochemically unstable and therefore unsuitable for commercial applications. Here we demonstrate singlet fission-derived triplet exciton transfer to c-Si from photochemically stable dipyrrolonaphthyridinedione (DPND) derivatives, with a thin layer of tin oxide as the passivation layer. An overlayer of poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) was found to improve interface passivation further. These observations demonstrate that singlet fission photovoltaic devices can be made using stable and commercially viable materials.
pubs.acs.org
Finally published in @natnano.nature.com, this work shows how A-site cation in perovskites influences dynamic nanodomains, fleeting pockets of tilted octahedra, lurking in the lattice. Nanoscale crystallography driving macroscopic performance! www.nature.com/articles/s41...
Dynamic nanodomains dictate macroscopic properties in lead halide perovskites - Nature Nanotechnology
Dynamic nanodomains in lead halide perovskites, dictated by A-site cations, crucially affect the optoelectronic properties by modulating electronic disorder and consequently enabling better solar cell...
nature.com
Congratulations on passing the PhD to Dr Abhinav Sharma, who I had the pleasure of supervising these last few years. He leaves us soon for greener pastures in Germany, but leaves behind a great read: unsworks.unsw.edu.au/entities/pub...