Latest Publications

Solvent-Free Method for Defect Reduction and Improved Performance of {p-i-n} Vapor-Deposited Perovskite Solar Cells Lohmann et al. ACS Energy Lett., 7:1903-1911 (May 2022) [ pdf ][ DOI:10.1021/acsenergylett.2c00865 ]	Interplay of structure, charge-carrier localization and dynamics in copper-silver-bismuth-halide semiconductors Buizza et al. Adv. Funct. Mater., 32:2108392 (Feb 2022) [ pdf ][ DOI:10.1002/adfm.202108392 ]	The application of one-dimensional nanostructures in terahertz frequency devices Peng et al. Appl. Phys. Rev., 8:041314 (Dec 2021) [ pdf ][ DOI:10.1063/5.0060797 ] We review the exciting field of 1D terahertz devices, with emphasis on semiconductor nanowires and carbon nanotubes
Ultrafast photo-induced phonon hardening due to pauli blocking in $MAPbI_3$ single-crystal and polycrystalline perovskites Xia et al. J. Phys-Mater., 4:044017 (Oct 2021) [ pdf ][ DOI:10.1088/2515-7639/ac22b9 ] We observed the shift of phonon modes in thin file and single crystals MAPbI3 that occurs when the materials are optically excited. We observe an ultrafast Pauli blocking effect with leads to phonon hardening / blue-shifting.	Hot electron cooling in InSb probed by ultrafast time-resolved terahertz cyclotron resonance Xia et al. Phys. Rev. B, 103:245205 (Jun 2021) [ pdf ][ DOI:10.1103/PhysRevB.103.245205 ] We develop and apply the technique of time resolved cyclotron resonance to observe electron cooling in the narrow bandgap semiconductor indium antimonide and find excellent agreement with first principles GW calculations.	Limits to electrical mobility in lead-halide perovskite semiconductors Xia et al. J. Phys. Chem. Lett., 12:3607-3617 (Apr 2021) [ pdf ][ DOI:10.1021/acs.jpclett.1c00619 ] We measure THz photoconductivity of single crystals and thin films of the prototypical metal halide perovskite MAPbI3. This direct comparison combined with DFT calculations allows us to study the influence of grain boundaries on charge-carrier scattering, and hence mobility.