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Optoelectronic Properties of Tin-Based Hybrid Metal Halide Perovskite Thin Films for Photovoltaics

Institute of Electrical and Electronics Engineers (IEEE) 00 (2019) 1-1

Authors:

Rebecca L Milot, Michael B Johnston, Laura M Herz
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Time-resolved THz spectroscopy of metal-halide perovskite single crystals and polycrystalline thin films

Institute of Electrical and Electronics Engineers (IEEE) 00 (2019) 1-2

Authors:

Chelsea Q Xia, Qianqian Lin, Jay B Patel, Adam D Wright, Timothy W Crothers, Rebecca L Milot, Laura M Herz, Michael B Johnston
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Unveiling Temperature-Dependent Scattering Mechanisms in Semiconductor Nanowires Using Optical-Pump Terahertz-Probe Spectroscopy

Institute of Electrical and Electronics Engineers (IEEE) 00 (2019) 1-1

Authors:

Jessica L Boland, Francesca Amaduzzi, Sabrina Sterzl, Heidi Potts, Gözde Tütüncüoglu, Laura M Herz, Anna Fontcuberta I Morral, Michael B Johnston
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Charge‐Carrier Dynamics, Mobilities, and Diffusion Lengths of 2D–3D Hybrid Butylammonium–Cesium–Formamidinium Lead Halide Perovskites

Advanced Functional Materials, 29(35), 1902656

Authors:

Leonardo RV Buizza, Timothy W Crothers, Zhiping Wang, Jay B Patel, Rebecca L Milot, Henry J Snaith, Michael B Johnston, Laura M Herz

Abstract:

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Electronic traps and phase segregation in lead mixed-halide Perovskite

ACS Energy Letters American Chemical Society 4:1 (2018) 75-84

Authors:

Alexander J Knight, Adam D Wright, Jay B Patel, David P McMeekin, Henry J Snaith, Michael B Johnston, Laura M Herz

Abstract:

An understanding of the factors driving halide segregation in lead mixed-halide perovskites is required for their implementation in tandem solar cells with existing silicon technology. Here we report that the halide segregation dynamics observed in the photoluminescence from CH3NH3Pb(Br0.5I0.5)3 is strongly influenced by the atmospheric environment, and that encapsulation of films with a layer of poly(methyl methacrylate) allows for halide segregation dynamics to be fully reversible and repeatable. We further establish an empirical model directly linking the amount of halide segregation observed in the photoluminescence to the fraction of charge carriers recombining through trap-mediated channels, and the photon flux absorbed. From such quantitative analysis we show that under pulsed illumination, the frequency of the modulation alone has no influence on the segregation dynamics. Additionally, we extrapolate that working CH3NH3Pb(Br0.5I0.5)3 perovskite cells would require a reduction of the trap-related charge carrier recombination rate to ≲105s–1 in order for halide segregation to be sufficiently suppressed.
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