Publication date: 21st July 2025
Lead-free halide perovskite quantum dots (QDs), including Sn-based and double perovskite QDs, have gained increasing attention as environmentally benign alternatives to lead-based perovskites for optoelectronic applications. These materials offer tunable bandgaps, strong light absorption, and excellent solution processability. However, achieving high crystal quality, defect tolerance, and efficient charge transport remains critical to unlocking their full potential.
In our recent studies, we have successfully synthesized phase-stable, low-defect Sn-based, Sn–Pb alloyed, and double perovskite QDs with enhanced photoluminescence quantum yields (PL QYs) and long carrier lifetimes [1–6]. Strategies such as Sn(IV) suppression and metal ion doping effectively minimized trap-mediated recombination and lattice distortion. Ultrafast transient absorption (TA) and time-resovled photoluminescence (TRPL) further revealed negligible electron or hole trapping, consistent with enhanced PL QY in optimized samples.
Focusing on double perovskite QDs, we developed Sb³⁺/Mn²⁺ co-doped Cs₂NaInCl₆ systems that exhibit efficient broadband white-light emission via self-trapped excitons. This co-doping approach not only induces white emission but also suppresses cation disorder, leading to PL QYs approaching 100%. To improve device performance, we replaced long-chain ligands with short-chain alternatives[8], which increased film conductivity by nearly 20-fold and reduced the hole-injection barrier by 0.4 eV. These improvements enabled light-emitting diodes (LEDs) with an external quantum efficiency (EQE) of 0.86%—the highest reported to date for double perovskite QD-based LEDs.
In this talk, we will present our recent progress in the synthesis, surface passivation, and photophysical characterization of lead-free perovskite QDs, and discuss their promising applications in optoelectronic devices such as LEDs. Our findings offer new insights into the design principles for achieving high-efficiency, stable, and environmentally friendly perovskite-based devices.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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