Interpretation of the Recombination Lifetime in Halide Perovskite Devices by Correlated Techniques

Abstract

Institute of Advanced Materials. He published the book Physics of Solar Energy Conversion (CRC Press, 2020) that establishes a general physical picture of solar energy devices. He has been distinguished in the list of Highly Cited Researchers from 2014 to 2021. He is Editor for Europe of the Journal of Physical Chemistry Letters. His research activity is dedicated to the mechanisms of energy devices such as the hybrid metal halide perovskites, a class of photovoltaic materials and devices that show excellent performance. He also investigates the resistive switching of perovskites for memory applications and brain-inspired computing. ■ ACKNOWLEDGMENTSWe thank the Ministerio de Ciencia e Innovación of Spain (MICINN) project PID2019-107348GB-100 for financial support.

Electrical Charge Coupling Dominates the Hysteresis Effect of Halide Perovskite Devices

“…The large scale perturbation techniques in the time domain are connected to the small signal impedance results, but the transformation is not straightforward. This topic has been discussed in refs and .…”

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

“…The model is based on well-understood features that have been amply investigated in the methods of IS, [29,59] to which we add the equivalent circuit part associated with radiative recombination that is not observed in the electrical impedance measurements. [30] A list of the elements used is presented in Table 1.…”

“…[29] The connection between time transients and light-stimulated frequency methods in halide perovskite has been reviewed recently. [30] Here, we explore a new experimental measuring technique that can provide significant information about recombination in high-performance solar cells and LEDs. We analyze the frequency-resolved light emission with respect to an applied modu lated voltage, that we denote light emission voltage modulated spectroscopy (LEVS).…”

“…The main point of this investigation is to reveal significant features of the radiative charge recombination that are difficult to be discerned in other measurement techniques. [30] This methodology will be especially useful when the radiative recombination event is convoluted with previous electronic carrier steps such as transport, trapping, or contact polarization effects, and/or ionic-related phenomena. It has previously been remarked that the capacitance and luminance of LEDs show correlated features [21,31,32] and some studies of electrically stimulated light emission spectroscopy have been reported, [33][34][35] but unfortunately, a general methodology has not been fully developed.Here we describe the first LEVS experiments in halide perovskite LEDs and establish an equivalent circuit model to understand the observed spectra, based on the previous experience in IS.…”

Quantitative Determination of Charge Accumulation and Recombination in Operational Quantum Dots Light Emitting Diodes via Time-Resolved Electroluminescence Spectroscopy

“…It is noticed that the charging curve of TRC follows a single exponential decay similar to a RC circuit . Therefore, it is deduced that an equivalent circuit with a series resistance, a capacitor, and a parallel resistance can be applied to analyze the operation of QLEDs under a pulsed voltage (see Figure d) . When a pulsed voltage is applied on the device, the capacitor will initially become short-circuited.…”