The Renaissance of Iron Pyrite Photovoltaics: Progress, Challenges, and Perspectives - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 153

Fig. 13 a schematic diagram of TiO 2 support with a thin layer of pyrite on top b band diagram
of thin layer sensitized solar cell. Reprinted with permission from [ 59 ]
above, it was found that the {111} face was inactive and less stable than the {100}
face of pyrite. Since this is the case, it was decided to make use of the {100}
terminated nano-cubes in our PV devices. Cadmium Sulfide quantum dots were
chosen to create the heterojunction in the cell due to the large offset of the valence
band of FeS 2 and the conduction band of CdS of 1.1 eV. It was hoped that this
would help overcome the problem of low photovoltages that plague the pyrite
system. The pyrite cubes did not create a nice film to create a bi-layer device, so a