Latest Publications

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 ]	In situ nanoscopy of single-grain nanomorphology and ultrafast carrier dynamics in metal halide perovskites Zizlsperger et al. Nat. Photon., 18:21 (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 ]	Direct and integrating sampling in terahertz receivers from wafer-scalable inas nanowires Peng et al. Nat. Commun., 15:103 (Jan 2024) [ pdf ][ DOI:10.1038/s41467-023-44345-1 ] We have developed a new approach to the fabrication of THz nanowire detectors. This approach lends itself to wafer-scale processing and array devices.