The hysteresis-free behavior of perovskite solar cells from the perspective of the measurement conditions

George Alexandru Nemnes; Cristina Besleaga; Andrei Gabriel Tomulescu; Lucia Nicoleta Leonat; Viorica Stancu; Mihaela Florea; Andrei Manolescu; Ioana Pintilie

doi:10.1039/c8tc05999c

arXiv · 1812.03855

The hysteresis-free behavior of perovskite solar cells from the perspective of the measurement conditions

George Alexandru Nemnes·Cristina Besleaga·Andrei Gabriel Tomulescu·Lucia Nicoleta Leonat·Viorica Stancu·Mihaela Florea·Andrei Manolescu·Ioana Pintilie

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Abstract

We investigate in how far the hysteresis-free behavior of perovskite solar cells can be reproduced using particular pre-conditioning and measurement conditions. As there are currently more and more reports of perovskite solar cells without J-V hysteresis it is crucial to distinguish between genuine performance improvements and measurement artifacts. We focus on two of the parameters that influence the dynamic J-V scans, namely the bias scan rate and and the bias poling voltage, and point out measurement conditions for achieving a hysteresis-free behavior. In this context we discuss the suitability of defining a hysteresis index (HI) for the characterization of dynamic J-V scans. Using HI, aging effects are also investigated, establishing a potential connection between the sample degradation and the variation of the maximal hysteresis on one hand, and relaxation time scale of the slow process, on the other hand. Pre-poling induced recombinations effects are identified. In addition, our analysis based on sample pre-biasing reveals potential indication regarding two types of slow processes, with two different relaxation time scales, which provides further insight regarding ionic migration.

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George Alexandru Nemnes, Cristina Besleaga, Andrei Gabriel Tomulescu, Lucia Nicoleta Leonat, Viorica Stancu, Mihaela Florea, Andrei Manolescu, Ioana Pintilie. 2019-02-21. The hysteresis-free behavior of perovskite solar cells from the perspective of the measurement conditions. https://doi.org/10.1039/c8tc05999c

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