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Monolithic quantum dot sensitized solar cells

We report a new design of solar cells based on semiconductor quantum dots (QDs), monolithic quantum dot sensitized solar cells (MQDSCs). MQDSCs offer the prospect of having lower cost and a simpler manufacturing process in comparison to conventional double substrate QDSCs. Our proposed monolithic QDSCs have a triple-layer structure, composed of a CdS sensitized mesoporous TiO2 photoanode, a scattering layer made by a core–shell structure of TiO2/SiO2, and a carbon active/graphite counter electrode layer, which are all deposited on a single fluorine doped tin oxide (FTO) glass substrate. Mesoporous TiO2 was sensitized with CdS QDs by successive ionic layer adsorption and reaction. Here, non-conventional solvents were utilized, which made it possible to deposit the CdS QDs in our monolithic structure. The measured photovoltaic properties and simple preparation method show that MQDSCs can be introduced as promising structures to make low-cost QDSCs in the near future.