Perovskite Solar Cells: Interface Engineering of Perovskite/Hole Transport Layer Using Nano‐Network Formation in Small Molecule–Polymer Blend for Efficient Inverted Perovskite Solar Cells (Adv. Mater. Interfaces 6/2021)

Water-soluble CuPc derivatives (TS-CuPc) have a self-assembly phase when present with PEDOT:PSS. In particular, a unique nano-mesh structure is formed in a thin film in which PEDOT:PSS and TS-CuPc are blended at a specific volume ratio. The nano-mesh structured thin film can be used as a hole transport layer of perovskite solar cell, and the efficiency of the device applied has increased efficiency and stability compared to the device to which pristine TS-CuPc or PEDOT:PSS films are applied. The cover figure shows the molecules of TS-CuPc that are aligned in the presence of PEDOT:PSS and the resulting mesh structure. More details can be found in article number 2001891 by Hyo Jung Kim and co-workers.