Abstract: Methods of fabricating nanocrystals are disclosed. Such methods may include providing copper sulfide core nanocrystals and providing a lead precursor. Moreover, the copper sulfide core nanocrystals may be reacted with the lead precursor to generate copper doped lead sulfide nanocrystals. Related nanocrystals and optoelectronic devices are also disclosed.

Abstract: A process for synthesizing Cu2-xS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60° C. Cu2-xS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60° C. for 6 minutes to form the PbS shell around the Cu2-xS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the Cu2-xS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the Cu2-xS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of Cu2-xS cores in the reaction, Cu2-xS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.

Abstract: A process for synthesizing Cu2-xS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60° C. Cu2-xS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60° C. for 6 minutes to form the PbS shell around the Cu2-xS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the Cu2-xS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the Cu2-xS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of Cu2-xS cores in the reaction, Cu2-xS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.

Abstract: A passivated iron disulfide (FeS2) surface encapsulated by an epitaxial zinc sulfide (ZnS) capping layer or matrix is provided. Also disclosed are methods for passivating the surface of crystalline iron disulfide by encapsulating it with an epitaxial zinc sulfide capping layer or matrix. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by ZnS.

Abstract: A method for passivating the surface of crystalline iron disulfide (FeS2) by encapsulating it within an epitaxial zinc sulfide (ZnS) matrix. Also disclosed is the related product comprising FeS2 encapsulated by a ZnS matrix in which the sulfur atoms at the FeS2 surfaces are passivated. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by a ZnS matrix.

Abstract: A method for passivating the surface of crystalline iron disulfide (FeS2) by encapsulating it within an epitaxial zinc sulfide (ZnS) matrix. Also disclosed is the related product comprising FeS2 encapsulated by a ZnS matrix in which the sulfur atoms at the FeS2 surfaces are passivated. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by a ZnS matrix.

Abstract: A passivated iron disulfide (FeS2) surface encapsulated by an epitaxial zinc sulfide (ZnS) capping layer or matrix is provided. Also disclosed are methods for passivating the surface of crystalline iron disulfide by encapsulating it with an epitaxial zinc sulfide capping layer or matrix. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by ZnS.

Abstract: A method for passivating the surface of crystalline iron disulfide (FeS2) by encapsulating it in crystalline zinc sulfide (ZnS). Also disclosed is the related product comprising FeS2 encapsulated by ZnS in which the sulfur atoms at the FeS2 surfaces are passivated. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by ZnS.

Abstract: A method for passivating the surface of crystalline iron disulfide (FeS2) by encapsulating it in crystalline zinc sulfide (ZnS). Also disclosed is the related product comprising FeS2 encapsulated by ZnS in which the sulfur atoms at the FeS2 surfaces are passivated. Additionally disclosed is a photovoltaic (PV) device incorporating FeS2 encapsulated by ZnS.