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Aromatic Molecules Control Perovskite Quantum Dot Ripening for Efficient Solar Cells
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DOI：10.1021/acsenergylett.6c01202.png)
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Abstract
En 中文
Perovskite quantum dots (PQDs) combine solution processability with excellent optoelectronic properties for next-generation photovoltaics. However, ligand depletion across synthesis, purification, film formation, and storage accumulates surface defects that drive aggregation and Ostwald ripening of the PQDs. Meanwhile, long-chain oleic acid (OA)/oleylamine (OAm) ligands act as insulating barriers within PQD solids, inhibiting charge carrier transport and solar cell performance. Here, we introduce a ligand-assisted ripening control (LARC) strategy that fortifies aromatic-molecule binding on formamidinium lead triiodide (FAPbI3) QDs to strengthen surface coordination and suppress ripening. Post-synthesis dosing with thiopheneacetic acid (TEAA) tunes the native OA/OAm acid–base equilibrium, facilitating proton exchange that drives controlled ligand desorption. The enhanced surface coordination suppresses ion detachment and breaks the dissolution–reprecipitation loop, thereby improving inter-QD electronic coupling. These synergistic effects yield FAPbI3 QD-based solar cells with power conversion efficiencies up to 18.88% and enhanced stability under both humidity storage and standard one-sun operational conditions.
Keywords:
Ligands
Perovskites
Quantum dots
Ripening
Solar cells
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