Performance and Stability of Polymer:Nonfullerene Solar Cells with 100 °C‐Annealed Electron‐Collecting Combination Layers

Inverted‐type organic solar cells, fabricated with low‐temperature‐processed combination layers of hybrid electron‐collecting buffer layers (ECBLs) consisting of zinc oxide (ZnO) and poly(2‐ethyl‐2‐oxazoline) (PEOz) and additional PEOz interlayers, showed improved performance and stability. The ZnO : PEOz precursor films with various PEOz compositions (0–12 wt %) were prepared and thermally treated at 100 °C, leading to the ECBLs on which the...