Dynamic THz signatures of charge-lattice correlations

• The hybrid metal halide perovskites have shown enormous promise for optoelectronic devices, including efficient photovoltaics, however their insensitivity to defects has remained puzzling. Polaron correlations have been cited as a possible means to protect charge carriers from defect scattering. In this paper, we show time-resolved THz spectroscopy measurements are capable of directly probing polaron correlations via an intra-band coherent beat arising from center-of-mass quasi-particle motion and the internal motion of charge within its self-induced potential. We describe these measurements indicating that charge carriers do indeed exist as polarons, which are coherent for several hundred femtoseconds following photon absorption.

Ämnesord

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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