Robust hole transport material with interface anchors enhances the efficiency and stability of inverted formamidinium–cesium perovskite solar cells with a certified efficiency of 22.3%

Herein, we report the use of pyridine anchoring group functionalized poly(triarylamine) (p-PY) as a hole transport layer at buried interfaces between the ITO and formamidinium–cesium perovskite layer to enhance the efficiency and stability of inverted PSCs.