Terahertz photonics

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Ultrafast Localisation and Charge Carrier Dynamics in Novel Bismuth Based Perovskite Inspired Materials

Fundacio Scito (2023)

Authors:

Snigdha Lal, Zhuotong Sun, Aleksander Ulatowski, Silvia Motti, Benjamin Putland, Harry Sansom, Marcello Righetto, Henry Snaith, Laura Herz, Robert Hoye, Judith Driscoll, Michael Johnston
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Methylammonium-free wide-bandgap metal halide perovskites for tandem photovoltaics

Nature Reviews Materials Springer Nature 8:12 (2023) 822-838

Authors:

Alexandra J Ramadan, Robert DJ Oliver, Michael B Johnston, Henry J Snaith
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Correction to "A Templating Approach to Controlling the Growth of Coevaporated Halide Perovskites".

ACS energy letters 8:11 (2023) 4714-4715

Authors:

Siyu Yan, Jay B Patel, Jae Eun Lee, Karim A Elmestekawy, Sinclair R Ratnasingham, Qimu Yuan, Laura M Herz, Nakita K Noel, Michael B Johnston

Abstract:

[This corrects the article DOI: 10.1021/acsenergylett.3c01368.].
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Terahertz characterization of charge carrier dynamics in 3D Dirac semi-metal Cd3As2 nanowires

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) IEEE (2023) 1-2

Authors:

Y Saboon, D Damry, CQ Xia, P Schoenherr, X Liu, Thorsten Hesjedal, Laura M Herz, Michael B Johnston, JL Boland

Abstract:

Optical Pump Terahertz Probe (OPTP) spectroscopy is a well-established measurement technique with which charge-carrier dynamics of semiconductor nanowires (NW) can be extracted in a noncontact manner. Here in this work, we employ OPTP spectroscopy for measuring temperature-dependent photoconductivity spectra of 3D Dirac Cd 3 As 2 semi-metal nanowires, revealing a high Extrinsic carrier concentration of ∼2.0x1017cm−3 and ultrahigh carrier mobility of up to ∼13x103cm2V−1s−1 at a temperature of 5 K.
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Topological materials for helicity-dependent THz emission

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) IEEE (2023) 1-2

Authors:

A Mannan, Y Saboon, CQ Xia, DA Damry, P Schoenherr, Dharmalingam Prabhakaran, Laura M Herz, Thorsten Hesjedal, Michael B Johnston, Jl Boland

Abstract:

Topological insulator (TI) materials are emerging as novel materials for spintronic applications. Here, we demonstrate helicity-dependent THz emission from Dirac semi-metal Cd 3 As 2 nanowires and used scattering-type scanning optical microscopy (s-SNOM) to identify potential single nanowire candidates for device applications. The preliminary investigation data of a candidate nanowire shows a homogenous topography and constant dielectric function in the MIR range. Indicating high-quality crystalline growth ideal for topological characterization.
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