USA As Represented by Secretary of the Navy

Steven C Erwin

Jasbinder Singh Sanghera

Jesse A Frantz

Jason D Myers

Colin C Baker

Rhonda Michele Stroud

Sarah F Brittman

Janice E Boercker

Patrick Y Yee

Paul D Cunningham

Michael H Stewart

Joseph G Tischler

Chase T Ellis

Katherine D Burgess

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.

Methods of forming nanocrystals and related crystals and optoelectronic devices

A process for synthesizing CuS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60&#xb0; C. CuS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60&#xb0; C. for 6 minutes to form the PbS shell around the CuS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the CuS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the CuS/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 CuS cores in the reaction, CuS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.

Core/shell nanocrystals with copper sulfide cores and lead sulfide shells

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

Method of passivating an iron disulfide surface via encapsulation in a zinc sulfide matrix

A passivated iron disulfide (FeS) 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 FeSencapsulated by ZnS.

Passivated iron disulfide surface encapsulated in zinc sulfide

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

Method of passivating an iron disulfide surface via encapsulation in zinc sulfide

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Washington, DC, United States of America

Steven C Erwin