Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Perovskite solar cells (PSCs) have shown notable improvements in performance in recent years; however, stability still poses a significant obstacle to large scale implementation. One potential avenue to improve stability is through the incorporation of passivation layers, which can enhance the electronic properties of the perovskite layer and mitigate charge recombination at the interfaces. In this work, we present a study of the impact of metal halide passivation on the performance and stability of wide band gap PSCs.
The primary focus is understanding the dual effect of the passivation through analysis of device performance and stability under environmental stress, as well as electronic properties. Passivated PSCs with a 1.77 eV bandgap exhibit up to a 60mV improvement in Voc and 1.5% absolute improvement in PCE compared to controls. However, this performance enhancement is countered by a negative impact on stability, particularly in Jsc. Passivated devices experienced a 50% reduction in current density in just 15 hours in 85°C AM1.5 conditions, compared to the control devices, which require 100 hours for an equivalent decline under identical stress conditions.
We hypothesize, based on analysis of fast hysteresis and photoluminescence characterization, that this accelerated degradation may be due to enhanced ion effects caused by the interaction between the perovskite and metal halide layers, resulting in the formation of a charge blocking layer that impedes current extraction. This work examines the trade-offs between performance and stability for PSCs employing metal salt passivation and aims to understand the degradation pathway caused by this added layer to help inform design principles and strategies for achieving both high performing and stable PSCs.
Surel acknowledges funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the SPP 2196 HIPSTER-PRO project.
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