Ionic liquid-assisted growth of high-quality methylammonium lead bromide single crystals for photodetection applications

Abstract

The control of nucleation temperature and growth kinetic during the inverse temperature crystallization (ITC) method is critical to achieve high quality perovskite single crystals (SCs) for various optoelectronic application. Here...

In-Line Electrochemical Impedance Spectroscopy for Real-Time Circuit Identification and Interpretation in Metal Halide Perovskite Single Crystals

“…To assess the electrical properties of MHPSCs, a thorough understanding of their electro-ionic interaction phenomena is crucial. This has been a focal point in the perovskite community, and attempts to understand these phenomena have been made by using current–voltage ( J – V ), current–transient ( I – T ), and electrochemical impedance spectroscopy (EIS) measurements under the conditions of varied temperatures, scan rates, or biases. − In comparison to J – V and I – T studies, EIS has emerged as a robust characterization tool due to its ability to provide information related to the ionic and charge movements with variation in frequency …”

“…However, practically, it has been found that the identified ECs often fail to provide an accurate classification of the EIS in varying stimuli conditions such as bias, temperature, and intensity. , One such method to identify the circuit type based on a human-learned approach was introduced by Huang et al, where they tried to correlate the impedance shape and the electrocatalytic activity, where a systematic mathematical analysis of first single-adsorbate reactions and subsequently more sophisticated reactions involving multiple adsorbates was utilized . Previously, we also discussed the evolution of EIS with respect to changes in the applied bias, temperature, and wavelength for perovskite solar cells and SCs. − ,− , In such situations, a close watch on the evaluation of EIS spectra, along with the identification of the appropriate EC, is crucial and needs to be performed precisely. Second, the extraction of circuit parameters within an acceptable range of accuracy is another crucial aspect.…”