Modulating Efficiency and Stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene Hydrazine

2023 IEEE 50TH PHOTOVOLTAIC SPECIALISTS CONFERENCE, PVSC(2023)

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摘要
Halide perovskite solar cells (PSCs) with state-of-the-art efficiencies consist of thermally unstable methylammonium (MA). In this report, we have employed the surface passivation method with multifunctional fluoroarene molecule, which suppresses the formation of PbI2 and delta-perovskite phase in MA/Br-free perovskite film. The penta fluorophenylhydrazine (5F-PHZ) passivation effectively mitigates the defects at surface or grain boundaries in perovskite film with fluoroarene embedded interfacial layer as a consequence of stronger halogen bonding with fluoroarene moieties or NH-NH2 terminal. As a result, the PSC with a p-i-n configuration achieved superior operational thermal stability and a PCE exceeding 22 % with a large area of similar to 1 cm(2). This work underscores a universal strategy for defect passivation to further improvement of efficiency using a multifunctional passivator. This report gives insights into the film growth properties, device photo-physics, and defect analysis correlating with device performance and device stability.
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