Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.7: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Measurement development for hysteresis characterization of perovskite solar cells — •Aniela Czudek1, Lukas Kegelmann1, Amran Al-Ashouri1, Steve Albrecht1, and Eva Unger1,2 — 1Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin, Germany — 2Lund University, Department of Chemical Physics, Lund, Sweden
Evaluating the performance of perovskite solar cells can be intricate due to transient current-voltage phenomena on different time scales. Current-voltage measurements in different scan directions may exhibit varying degrees of discrepancy - often referred to as hysteresis - which makes defining the 'right' measurement conditions difficult. We here present a procedure to assess the steady-state solar cell performance of perovskite devices using an iterative - perturb and observe - maximum power point tracking algorithm. This methodology is directly used to also investigate the transient response of devices upon voltage perturbation around maximum power point. The time constants of transient current response allows for a quantitative comparison of different device architecture types and determine the minimum delay time (voltage settling time) required to perform current-voltage measurements at quasi-steady-state condition of the device. We will show and discuss how this methodology was utilize to quantitatively compare perovskite solar cells of different architecture types, contact layers and perovskite absorber composition.