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US 2018/0023213 A1Published application
Article comprising a semiconducting material
AssigneeThe Florida State University Research Foundation, Inc.
InventorsJeffrey Whalen, Theo Siegrist
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Abstract
Single crystals of the new semiconducting oxychalcogenide phase were synthesized using a novel crystal growth method. The crystals had low defects and homogeneous composition as characterized by single crystal X-ray diffraction and scanning electron microscopy, respectively. Heat capacity and resistivity measurements were in agreement with the calculated band structure calculations indicating semiconductivity, with a band gap of about 3 eV.
Claims17
A method for forming an oxychalcogenide composition, comprising:
- providing a mixture having a molar ratio of about 20 R:1 RO:1 X, where R is an alkaline earth metal cation, X is a chalcogen, and O is oxygen;
- heating the mixture until the mixture melts;
- fluxing the melted mixture at least at the melting point for about 10 hours;
- allowing the mixture to cool;
- and
- removing one or more oxychalcogenide crystals from the mixture, where the one or more oxychalcogenide crystals, comprise:
- a tetragonal crystal of repeating units of RX and RO;
- wherein R is an alkaline earth metal cation, X is an anionic chalcogen, and O is oxygen;
- where the alkaline earth metal cation of RO is integrated into a crystalline structure with the unit of RX;
- and
- wherein the R:X molar ratio is about 2:1.
8 more elements
A method for forming an oxychalcogenide composition, comprising:
- providing a mixture having a molar ratio of about 20 R:1 RO:1 X, where R is an alkaline earth metal cation, X is a chalcogen, and O is oxygen;
- placing the mixture in a crucible;
- sealing the crucible;
- heating the mixture until the mixture melts;
- fluxing the melted mixture at least at the melting point for about 10 hours;
- allowing the mixture to cool;
- and
- removing one or more oxychalcogenide crystals from the mixture, where the one or more oxychalcogenide crystals, comprise:
- a tetragonal crystal of repeating units of RX and RO;
- wherein R is an alkaline earth metal cation, X is an anionic chalcogen, and O is oxygen;
- where the alkaline earth metal cation of RO is integrated into a crystalline structure with the unit of RX;
- and
- wherein the R:X molar ratio is about 2:1.
10 more elements
Dependencies are inferred from the claim text.