am1c24763_si_001.pdf (806.37 kB)
Download fileUsing Ligand Engineering to Produce Efficient and Stable Pb–Sn Perovskite Solar Cells with Antioxidative 2D Capping Layers
journal contribution
posted on 2022-03-21, 19:03 authored by Ge Wang, Chen Wang, Roderick C. I. MacKenzie, Zihan Zhu, Yi Chen, Shengping Ruan, Shanpeng WenPb–Sn
binary halide perovskites are a promising photovoltaic
material due to their low toxicity and optical absorption spectrum
well matched to the solar spectrum. However, the ready oxidation of
Sn2+ to Sn4+ makes the material system currently
too unstable to commercialize. Herein, ligand engineering based on
antioxidative tyramine (hydrochloride, TACl) is presented for the
first time to increase the stability of this material system. Using
this strategy, we generate a two-dimensional (2D) capping layer on
top of a standard three-dimensional Pb–Sn film. After capping,
the surface defects can be passivated and the TACl-based 2D perovskite
effectively protected Sn2+ from oxidation, which stabilized
the Sn–Pb perovskite composition, avoiding the Pb-based perovskite
formation. It is further found that the TACl treatment suppressed
the halide segregation and improved the perovskite film photostability.
Cell efficiency increases from 16.25 to 18.28% and device lifetime
(T80) increases from less than 100 to
over 1000 h. Our finding suggests that tuning ligand form/function
represents a potentially highly productive direction to explore when
trying to produce stable tin-based perovskite devices.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
tuning ligand formperovskite film photostabilityligand engineering baseddevice lifetime (<cell efficiency increasesbased perovskite formationbased perovskite devicesproduce stable tin4 + sup2 + supusing ligand engineeringtacl treatment suppressedmaterial system currentlymaterial systemproduce efficientsurface defectsstandard threesolar spectrumlow toxicityhalide segregationfunction representsfirst timefinding suggestsantioxidative tyramine>< sub1000 h