Record-Efficiency Printable Hole-Conductor-Free Mesoscopic Perovskite Solar Cells Enabled by the Multifunctional Schiff Base Derivative.
basic_science · Level V
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- Record sourced from PubMed, PMID 38531370.
- Also identified by DOI 10.1002/adma.202401319.
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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<sub>2</sub> electron transport layer and the MAPbI<sub>3</sub> light absorber during the annealing process. CDCl chemically links to TiO<sub>2</sub> and MAPbI<sub>3</sub> 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<sub>2</sub>/MAPbI<sub>3</sub> heterojunction and improves the pore-filling and crystallization of MAPbI<sub>3</sub> 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<sub>3</sub>.