4.8 Article

Radiative Recombination Processes in Halide Perovskites Observed by Light Emission Voltage Modulated Spectroscopy

Journal

ADVANCED MATERIALS
Volume 35, Issue 11, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202207993

Keywords

halide perovskites; light-emission kinetics; light-emitting diodes; radiative recombination; solar cells

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In this study, the kinetics of light emission in high-performance halide perovskite LEDs were investigated using a new methodology called light emission voltage modulated spectroscopy (LEVS). The spectra obtained provided detailed information on at least three different characteristic times. LEVS shows promise to capture internal kinetics that are difficult to be discerned by other techniques.
The kinetics of light emission in halide perovskite light-emitting diodes (LEDs) and solar cells is composed of a radiative recombination of voltage-injected carriers mediated by additional steps such as carrier trapping, redistribution of injected carriers, and photon recycling that affect the observed luminescence decays. These processes are investigated in high-performance halide perovskite LEDs, with external quantum efficiency (EQE) and luminance values higher than 20% and 80 000 Cd m(-2), by measuring the frequency-resolved emitted light with respect to modulated voltage through a new methodology termed light emission voltage modulated spectroscopy (LEVS). The spectra are shown to provide detailed information on at least three different characteristic times. Essentially, new information is obtained with respect to the electrical method of impedance spectroscopy (IS), and overall, LEVS shows promise to capture internal kinetics that are difficult to be discerned by other techniques.

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