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Abstract Tailoring multifunctional additives for performing interfacial modifications, improving crystallization, and passivating defects is instrumental for the fabrication of efficient and stable perovskite solar cells (PSCs). Here, a Schiff base derivative, (chloromethylene) dimethyliminium chloride (CDCl), is introduced as an additive to modify the interface between the mesoporous TiO 2 electron transport layer and the MAPbI 3 light absorber during the annealing process. CDCl chemically links to TiO 2 and MAPbI 3 through coordination and hydrogen bonding, respectively, and results in the construction of fast electron extraction channels. CDCl also optimizes the energy‐level alignment of the TiO 2 /MAPbI 3 heterojunction and improves the pore‐filling and crystallization of MAPbI 3 in the mesoscopic scaffold, which inhibits nonradiative recombination and eliminates open‐circuit voltage losses. As a result, an impressive power conversion efficiency of 19.74%, which is the best one ever reported, is obtained for printable carbon‐based hole‐conductor‐free PSCs based on MAPbI 3 .
Chen et al. (Tue,) studied this question.
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