Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
A higher surface coverage of QD sensitizers on the oxide substrate is a “must” to improve the efficiencies of quantum dot sensitized solar cells (QDSCs). Due to the big size and lack of anchoring site on colloidal QD surface, the deposition of colloidal QD on TiO2 film electrode has being a bottleneck in the construction of high efficiency QDSCs. A capping ligand-induced selfassembly approach, wherein QDs capped with bifunctional linker ligands such as mercaptopropionic acid (MPA) are immobilized on TiO2 prompted by the affinity between carboxyl group and TiO2, has been developed to achieve fast, uniform, and dense deposition of colloidal QD on TiO2 electrode. 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 electrodes. With the combination of high-quality QD sensitizers, effective deposition technique, and suppressed charge recombination, 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 9.0%. We believe that through optimizing the electrolyte and counter electrode, the PCE of QDSCs will break through 10% (the threshold for commercial applications)in the near future.
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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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