Contact Engineering and In Situ Formation of 2D Perovskite Via Solid‐Phase Growth for Efficient Hole‐Transport‐Layer‐Free Perovskite Solar Cells

Perovskite Solar Cells In article number 2300020, Congcong Wu, Haijin Li, and co-workers present a contiguous contact of perovskite/carbon interface achieved by in situ formation of 2D perovskite through a solid phase reaction when fabricating a carbon electrode. The 2D perovskite interlayer not only passivates surface defects but also enables a seamless contact at the perovskite/carbon interface and promotes carrier transport, thereby improving power conversion efficiency and stability of hole-transport-layer-free perovskite solar cells simultaneously.