Hernández-Balaguera EMuñoz-Díaz LPereyra CLira-Cantú MNajafi MYULIA GALAGAN2022-11-162022-11-16202224686069https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132428056&doi=10.1016%2fj.mtener.2022.101031&partnerID=40&md5=7de8d9fadf2d2a3c641ae499616a1f3bhttps://scholars.lib.ntu.edu.tw/handle/123456789/625105The unprecedented increase of photovoltaic perovskites performance metrics has been obscured by the puzzling phenomenology underlying the device's anomalous ionic/electronic landscape. Thus, the establishment of a reliable measurement protocol of efficiency measurements, unanimously adopted by the perovskite's community, is indeed necessary to ensure comparability of device performance between different research laboratories. Here, we report a control strategy of ionic-electronic cooperative relaxation phenomena, eliminating the “hysteria around hysteresis”. The procedure, based on mixed engineering strategies, solves the problem that arises from the difficulty of providing steady-state device operation conditions, capturing in turn the anomalous capacitive behavior. From the determination of an optimal scan rate for J–V modeling, we provide an experimental visualization of the interplay between perovskites' ionic and electronic responses. The results of this combined theoretical and experimental study identify key guidelines about assessment procedural of device performance that should be taken into account in future publications to further improve reproducibility in the research field. © 2022 Elsevier LtdDevice performance assessment; Impedance spectroscopy; J–V hysteresis; Metal halide perovskites; Transient analysis[SDGs]SDG7Conversion efficiency; Hysteresis; Metal halides; Perovskite; Perovskite solar cells; Research laboratories; Control strategies; Device performance; Device performance assessment; Efficiency measurement; Halide perovskites; Impedance spectroscopy; J–V hysteresis; Metal halide perovskite; Performance assessment; Universal control; Transient analysisjournal article10.1016/j.mtener.2022.1010312-s2.0-85132428056