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US 8,679,445 B1Granted
Synthesis of CsSnI3 by temperature gradient solid-phase sintering method
AssigneeSun Harmonics Ltd
InventorsYuhang Ren, Jin Zhang, Yizhi Li, Kai Shum
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Abstract
This invention discloses a solid-based synthesis of cesium tin tri-iodide (CsSnI3). More specifically, the CsSnI3 is fabricated in a 3 zone high temperature resisting tube by the solid-phase sintering method. CsSnI3 are ideally suited for a wide range of applications such as light emitting and photovoltaic devices.
Claims11
A process of forming CsSnI3 in a high temperature resistant tube, comprising the steps of:
- (1) providing a 3 zone high temperature heating unit having first and second end or opposing zones and a third intermediate portion or zone;
- (2) providing CsI powder;
- (3) providing SnI2 powder;
- (4) mixing said CsI and SnI2 powders to provide a mixture wherein the molar ratio of the SnI2 and CsI in the mixture is selected to be in the range from about 1/1 to 5/1;
- (5) creating a vacuum within said heating unit and sealing the mixed powder in said first zone of said heating unit;
- (6) placing said heating unit into a heating chamber of a furnace and heating said first zone of said heating unit at a temperature maintained above 450° C. to form black CsSnI3;
- and
- (7) collecting evaporated SnI2 in said second zone of said heating unit.
5 more elements
Dependencies are inferred from the claim text.