Publication date: 10th June 2020
Perovskite quantum dots (QDs) have the advantages of quantum confinement effect, defect-tolerant nature, and the capability of developing lightweight and flexible films, thus attracting much recent research focus for a variety of functional device developments including QD solar cells. Here we report our recent progress on a novel surface ligand engineering strategy in designing perovskite QDs, which led to a record power conversion efficiency of 16.6% in quantum dot solar cells. In normal practice, the long carbon-chain ligands on the surface of QDs not only confine the growth of QDs, but also play an important role in passivating the surface defects. However, these long-chain ligands are insulating and limiting the transport of charge carriers within QD film. To improve the electronic coupling between QDs, we discovered that increasing the concentration of oleic acid ligands during the formation of mixed-cation perovskite QDs facilitates preserve high radiative efficiency by suppressing surface defects. This new finding allowed us not only fundamentally understand the optoelectronic working mechanism of the QDs, but also remarkably improve the optoelectronic quality of the perovskite QDs. The new classes of perovskite quantum dots have been used as building blocks in Quantum Dot Solar Cells with a certified record efficiency of 16.6% (https://en.wikipedia.org/wiki/Solar_cell_efficiency). By using QDs as light absorbing materials, the QD based photocatalysts also exhibited good performance in photocatalytic gaseous hydrogen production.
Keywords：perovskites quantum dots, power conversion efficiency, water splitting
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