Ag Electrode Anticorrosion in Inverted Perovskite Solar Cells

Abstract

Ag electrode is widely used in inverted perovskite solar cells (PSCs), but its easy reaction and corrosive nature with perovskite always induces severe stability issue. Here, from typical theory of metal anticorrosion, a chemical anticorrosion approach for Ag electrode in inverted PSCs through introducing 2‐mercaptobenzothiazole (MBT) as a corrosion inhibitor is reported. MBT can strongly bond to Ag and form a compact [MBT‐Ag] chain on Ag surface owing to its N atom in thiazolyl ring and exocyclic thiol groups. As a result, Ag anticorrosion ability is greatly enhanced by increasing the corrosion potential and decreasing the corrosion current, thus effectively inhibiting possible chemical reaction and corrosion between perovskite and Ag electrodes. PSCs containing MBT/Ag exhibit high efficiency of over 23% with good stability, retaining 95 ± 4.1% of initial efficiency after storage for 3800 h in glovebox. Importantly, resulting PSCs also show excellent thermal stability, maintaining 90 ± 1.8% of initial efficiency after aging for 900 h at 85 °C.

Engineering of the perovskite/electron-transporting layer interface with transition metal chalcogenides for improving the performance of inverted perovskite solar cells

“…This behavior can be attributed to the degradation of the Ag electrode caused by its reaction with iodine, which migrated from the perovskite layer. 101–103 The device incorporating SnS 2 nanosheets showed the worst stability, while the one containing MoSe 2 nanosheets exhibited similar behavior to the reference cell. On the other hand, the incorporation of InSe led to the disappearance of the burn-in phase, enhancing the cell stability.…”

Key Roles of Interfaces in Inverted Metal-Halide Perovskite Solar Cells

“…Usually, low work function (WF) metals (e.g., silver, copper, aluminum, etc.) that are easily corroded or oxidized by air or halogens are used. − In IPSCs, the WF of the electrodes needs to match the ETL; otherwise, the charge transfer efficiency will be affected. A stable metal like gold has a higher WF when used as an electrode.…”

Improved photovoltaic performance and stability of perovskite solar cells by adoption of an n-type zwitterionic cathode interlayer

“…For instance, Li et al introduced 2-mercaptobenzothiazole (MBT) as a corrosion inhibitor to prevent Ag corrosion. 17 The [MBT-Ag] chain formed on Ag through interaction between the N atom (in the thiazolyl ring and the thiol group) and Ag exhibited significantly suppressed corrosion of Ag. The PeSCs fabricated based on this strategy achieved a PCE of 23.37%, maintaining over 90% of the initial PCE for more than 900 h at 85 °C.…”