Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.031
Publication date: 4th December 2020
A capping ligand-induced self-assembly approach, wherein QDs capped with bifunctional linker ligands such as mercaptopropionic acid (MPA) are immobilized on TiO2 matrix prompted by the affinity between carboxyl group and TiO2, has been developed to achieve fast, uniform, and dense deposition of colloidal QD on TiO2 filmelectrode. Meanwhile, alloyed and type-II core/shell structured QD sensitizers with features of wide absorption range and high conduction band edge have been designed and prepared. Furthermore, the potential charge recombination inside QD, and at photoanode/electrolyte interfaces is substantially suppressed with the use of buffer layer and energetic barrier layers, consisting of a am-TiO2/ZnS/SiO2 recipe onto QD sensitized TiO2 photoanodes. With the combination of high-quality QD sensitizers, effective deposition technique, suppressed charge recombination, and the high performance mesoporous carbon supported titanium mesh (MC/Ti) counter electrode, the power conversion efficiency (PCE) of QDSCs under simulated AM 1.5, full 1 sun illumination has been improved steadily from the level of 4-5% to a certified value of 14.4%.
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