Journal Article

FZJ-2021-00061

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells

Alvarez, A. O. ; Arcas, R. ; Aranda, C. A. (Corresponding author)FZJ* ; Bethencourt, L. ; Mas-Marzá, E. ; Saliba, M.FZJ* ; Fabregat-Santiago, F. (Corresponding author)

2020
ACS Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/26951  doi:10.1021/acs.jpclett.0c02331

Abstract: Negative capacitance in the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use impedance spectroscopy to analyze these responses in methylammonium lead bromide cells treated with lithium cations at the electron-selective layer/perovskite interface and in iodide devices exposed to different relative humidity conditions. Employing the surface polarization model, we obtain a time constant associated with the kinetics of the interaction of ions/vacancies with the surface, τkin, in the range of 100–102 s for all the cases exhibiting both features. These interactions lead to a decrease in the overall recombination resistance, modifying the low-frequency perovskite response and yielding a flattening of the cyclic voltammetry. As a consequence of these results we find that negative capacitance and inverted hysteresis lead to a decrease in the fill factor and photovoltage values.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 121 - Solar cells of the next generation (POF3-121) (POF3-121)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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