Photoanodes with mesoporous TiO2 beads and nanoparticles for enhanced performance of CdS/CdSe quantum dot co-sensitized solar cells

Interface Engineering in Quantum-Dot-Sensitized Solar Cells

The unique properties of II-VI semiconductor nanocrystals such as superior light absorption, size-dependent optoelectronic properties, solution processability, and interesting photophysics prompted quantum-dot-sensitized solar cells (QDSSCs) as promising candidates for next-generation photovoltaic (PV) technology. QDSSCs have advantages such as low-cost device fabrication, multiple exciton generation, and the possibility to push over the theoretical power conversion efficiency (PCE) limit of 32%. In spite of dedicated research efforts to enhance the PCE, optimize individual solar cell components, and better understand the underlying science, QDSSCs have unfortunately not lived up to their potential due to shortcomings in the fabrication process and with the QDs themselves. In this feature article, we briefly discuss the QDSSC concepts and mechanisms of the charge carrier recombination pathways that occur at multiple interfaces, viz., (i) metal oxide (MO)/QDs, (ii) MO/QDs/electrolyte, and (iii) counter electrode (CE)/electrolyte. The rational strategies that have been developed to minimize/block these charge recombination pathways are elaborated. The article concludes with a discussion of the present challenges in fabricating efficient devices and future prospects for QDSSCs.

Charge recombination control for high efficiency CdS/CdSe quantum dot co-sensitized solar cells with multi-ZnS layers

ZnS as an inorganic passivation agent has been proven to be effective in suppressing charge recombination and enhancing power conversion efficiency (PCE) in quantum dot-sensitized solar cells (QDSCs).

Optimized design of multi-shell ZnO/TiO2/ZnSe nanowires decorated with Ag nanoparticles for photocatalytic applications

The photocatalytic activity of ZnO/TiO₂/Ag/ZnSe nanowires was significantly enhanced under light irradiation compared with that of ZnO/TiO₂/ZnSe/Ag nanowires.

Application of aqueous Ag:ZnInSe quantum dots to non-toxic sensitized solar cells

A non-toxic, aqueous Ag:ZnInSe quantum dot-sensitized solar cell with an efficiency of 0.89% at 1 sun was fabricated.

Chemical bath deposition of Cu2O quantum dots onto ZnO nanorod arrays for application in photovoltaic devices

A protective CuO layer on the Cu₂O quantum dots was prepared by simply heat-treating the Cu₂O/ZnO hetero-nanorod arrays in ambient air, which enhances the photovoltaic stability.