Reaction Dynamics between Formamidinium Lead Iodide and Copper Oxide
Katarzyna Gawlińska Nęcek1, Małgorzata Kot2, Zbigniew Starowicz1
1Institute of Metallurgy and Materials Science Polish Academy of Sciences, Reymonta 25 St., 30-059 Krakow, Poland.
ACS Applied Materials & Interfaces
|October 24, 2024
Summary
Copper oxide (CuO) layers degrade perovskite solar cells, regardless of copper oxidation state or preparation method. New strategies are needed to prevent CuO diffusion and reactions with formamidinium lead triiodide (FAPI) perovskite films.
Area of Science:
- Materials Science
- Photovoltaics
- Chemical Engineering
Background:
- Copper oxide (CuO) is a promising hole-transporting layer for perovskite solar cells.
- Previous work showed copper(I) oxide (Cu2O) diffusion and reaction with formamidinium lead triiodide (FAPI) perovskite.
Purpose of the Study:
- Investigate if CuO degradation products depend on CuO oxidation state or preparation method.
- Determine the efficacy of an aluminum oxide (Al2O3) interlayer in preventing CuO migration.
Main Methods:
- Prepared CuO films via thermal oxidation (120-300 °C).
- Observed oxidation state transformation from Cu2O to CuO with increasing temperature.
- Introduced an ultrathin Al2O3 layer between CuO and FAPI films.
Main Results:
- FAPI perovskite degradation occurred with both Cu2O and CuO films.
- Reaction products differed slightly between copper oxidation states.
- An Al2O3 interlayer only partially blocked CuO migration into the FAPI film.
Conclusions:
- FAPI perovskite decomposition is unavoidable with current CuO preparation methods.
- CuO migration and reaction with FAPI perovskite occur regardless of CuO's oxidation state or preparation.
- Novel strategies are essential to enable CuO's use as a hole-transporting layer in solar cells.
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