posted on 2021-10-04, 07:14authored bySikai Mei, Zhipeng Yin, Pengcheng Gu, Hai-Qiao Wang, Jianhao Wang, Weijie Song
Metal
electrode corrosion by halogen species from perovskites causes
severe degradation in perovskite solar cells (PSCs). By employing
the Au–Ag bilayer top electrode, we show improved operational
stability for PSCs compared to devices with a single metal electrode.
The optoelectronic property of bilayer electrodes and their influence
on device parameters and operational stability are characterized and
discussed. Significantly enhanced operational stability (T80 > 200 h) is demonstrated compared to pure Ag metal
electrode devices (T40 ≈ 200 h),
under maximum power point conditions. The applicability of this strategy
is further confirmed by the Au–Al bilayer electrode system.
The work not only demonstrates an effective method to prevent metal
electrode corrosion and perovskite decomposition but also provides
insights into the working principle and degradation of PSCs.