Latest Publications

Control over the microstructure of vapour-deposited cspbbr3 enhances amplified spontaneous emission Yuan et al. Adv. Optical Mater., 13:e02160 (Sep 2025) [ pdf ][ DOI:10.1002/adom.202502160 ] We show that controlling the microstructure of vapor-deposited $\gamma$-CsPbBr$_3$ suppresses defects and impurity phases that limit optical gain. Optimised growth conditions yield enhanced photoluminescence and a low amplified spontaneous emission threshold of $30.9~\mu\mathrm{J\,cm^{-2}}$.	Resonance-amplified terahertz near-field spectroscopy of a single nanowire Norman et al. Nano Lett., 24:15716--15723 (Nov 2024) [ pdf ][ DOI:10.1021/acs.nanolett.4c04395 ] A resonance-amplified terahertz near-field spectroscopy technique is demonstrated that exploits a bowtie antenna to sensitively probe ultrafast conductivity changes in a single InAs nanowire, enabling quantitative extraction of photoexcited carrier dynamics with sensitivity to conductivity variations corresponding to as few as 100 additional charge carriers.	In situ nanoscopy of single-grain nanomorphology and ultrafast carrier dynamics in metal halide perovskites Zizlsperger et al. Nat. Photon., 18:975–-981 (Sep 2024) [ pdf ][ DOI:10.1038/s41566-024-01476-1 ] In this collaborative work with Regensburg we study vertical charge transport in vapour-deposited metal halide perovskites.
Contrasting ultra-low frequency raman and infrared modes in emerging metal halides for photovoltaics Lim et al. ACS Energy Lett., 9:4127-4135 (Jul 2024) [ pdf ][ DOI:10.1021/acsenergylett.4c01473 ] We propose that the central response observed in Raman spectra from hybrid metal halide perovskites results from an interplay of the significant broadening of Raman-active, low-energy phonon modes that are strongly amplified by a population component from Bose-Einstein statistics toward low frequency.	Bandgap-universal passivation enables stable perovskite solar cells with low photovoltage loss Lin et al. Science, 384:767-775 (May 2024) [ pdf ][ DOI:10.1126/science.ado2302 ] We demonstrate a vapor-based amino-silane passivation that reduces photovoltage deficits to around 100 millivolts (>90percent of the thermodynamic limit) in perovskite solar cells of bandgaps between 1.6 and 1.8 electron volts, which is crucial for tandem applications.	The role of the organic cation in developing efficient green perovskite leds based on quasi-2d perovskite heterostructures Ramadan et al. Adv. Funct. Mater., 34:2309653 (Apr 2024) [ pdf ][ DOI:10.1002/adfm.202309653 ]