Multifunctional Two-Dimensional Conjugated Materials for Dopant-Free Perovskite Solar Cells with Efficiency Exceeding 22%

Replacing the dominated hole transport material (HTM), doped Spiro-OMeTAD, in state-of-the-art perovskite solar cells (PSCs) is a challenge but an urgent issue for commercialization of this technology. Here, a solution-processable two-dimensional (2D) polymer HTM, namely, 2DP-TDB, which featuring with extended π-electron delocalization into the two-dimensions, has been successfully developed. It is found that 2DP-TDB shows multifunctional...