TY - GEN A1 - Gawlińska−Nęcek, Katarzyna A1 - Dąbczyński, Paweł A1 - Nuckowski, Paweł A1 - Starowicz, Zbigniew A1 - Kot, Małgorzata A1 - Panek, Piotr A1 - Flege, Jan Ingo T1 - Crystallographic changes mediated by copper migration from hole transporting layer into CsPbBr₃ perovskite T2 - The journal of physical chemistry C N2 - Copper oxides, due to their low cost and high ambient stability, are promising candidates for use as a hole-transporting layer (HTL) in perovskite solar cells. However, it has been found that they can be very unstable in contact with organic–inorganic FAPbI3 perovskite, causing mutual chemical reactions and changing a photoactive to a nonphotoactive perovskite phase. To verify if the copper migration and the occurrence of chemical reactions are a matter of contact with a type of perovskite (organic–inorganic or fully inorganic) or the nature of copper oxides, in this work, the interface between cupric and cuprous oxides and a fully inorganic cesium lead bromide (CsPbBr3) perovskite is investigated. It is found that CsPbBr3 is not robust against copper ion migration from HTL, similarly to organic–inorganic FAPbI3; however, contrary to the previous results, they do not cause chemical reactions. Instead, crystallographic lattice shrinkage of the CsPbBr3 occurred along with the substitution of Pb2+ by copper ions. The work explains the mechanism of this phenomenon and confirms the unreliability of copper(I) oxide and copper(II) oxide as HTLs in p-i-n perovskite solar cells based on both organic–inorganic and fully inorganic lead halide perovskites. KW - Copper KW - Lattices KW - Oxides KW - Solar Cells Y1 - 2025 U6 - https://doi.org/10.1021/acs.jpcc.5c06144 SN - 1932-7447 VL - 129 IS - 43 SP - 19410 EP - 19420 PB - American Chemical Society (ACS) CY - Washington, DC ER -