Charge-transporting layers are important in determining the performance and stability of perovskite solar cells (PSCs). Recently, there is a tide of using a self-assembled monolayer (SAM) as charge-selective contact, especially for the hole-selective SAMs in inverted PSCs as well as perovskite involved tandem solar cells. The SAM-based charge-selective contact shows many advantages over traditional thin-film organic/inorganic charge-transporting layers, including reduced cost, low optical and electric loss, conformal coating on a rough substrate, simple deposition on the large-area substrate and easy modulation of energy levels, molecular dipoles and surface properties. The incorporation of various hole-selective SAMs has resulted in high-efficiency single junction and tandem solar cells. This topic review summarizes both advantages and challenges of SAM based charge-selective contact, and discusses potential directions for future studies.
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