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A photon ratchet route to high-efficiency hybrid halide perovskite intermediate band solar cells
Jarvist M. Frost, Pooya Azarhoosh, Scott McKechnie +2
The spin-split indirect bandgap in hybrid-halide perovskites provides a momentum-space realisation of a photon-ratchet intermediate band. Excited electrons thermalise to recombinat…
Phonon anharmonicity, lifetimes and thermal transport in CHNHPbI from many-body perturbation theory
Lucy D. Whalley, Jonathan M. Skelton, Jarvist M. Frost +1
Lattice vibrations in CHNHPbI are strongly interacting, with double well instabilities present at the Brillouin zone boundary. Analysis within a first-principles lattic…
Indirect to direct bandgap transition in methylammonium lead halide perovskite
Tianyi Wang, Benjamin Daiber, Jarvist M. Frost +4
Methylammonium lead iodide perovskites are considered direct bandgap semiconductors. Here we show that in fact they present a weakly indirect bandgap 60 meV below the direct bandga…
Dynamic disorder, phonon lifetimes, and the assignment of modes to the vibrational spectra of methylammonium lead halide perovskites
Aurélien M. A. Leguy, Alejandro R. Goñi, Jarvist M. Frost +11
We present Raman and terahertz absorbance spectra of methylammonium lead halide single crystals (MAPbX3, X = I, Br, Cl) at temperatures between 80 and 370 K. These results show goo…
Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells
Pooya Azarhoosh, Jarvist M. Frost, Scott McKechnie +2
The hybrid perovskite CH3NH3PbI3 (MAPI) exhibits long minority-carrier lifetimes and diffusion lengths. We show that slow recombination originates from a spin-split indirect-gap. L…
Direct Observation of Dynamic Symmetry Breaking above Room Temperature in Methylammonium Lead Iodide Perovskite
Alexander N. Beecher, Octavi E. Semonin, Jonathan M. Skelton +7
Lead halide perovskites such as methylammonium lead triiodide (MAPI) have outstanding optical and electronic properties for photovoltaic applications, yet a full understanding of h…
What is moving in hybrid halide perovskite solar cells?
Jarvist M. Frost, Aron Walsh
Organic-inorganic semiconductors, which adopt the perovskite crystal structure, have perturbed the landscape of contemporary photovoltaics research. In this Account, we discuss the…