Patent ID: 8470693

Claim:
A method of manufacturing a quantum dot, comprising: setting a ratio of a second material to a first material to a value of not less than a first reference value, and depositing an amorphous thin film on a substrate; raising a temperature of the amorphous thin film deposited at the setting a ratio to a preset temperature at a temperature raising rate of not lower than 0.2° C./second; and heat-treating the amorphous thin film at the preset temperature to form a heat-treated amorphous thin film; wherein: the preset temperature is a temperature for generating a crystal grain; the first material includes a first element; the second material includes a second element; the first reference value is a ratio of the second material to the first material when a stoichiometric insulating film including the first and second elements is formed; a second reference value is a ratio of the second material to a third material including a third element when a stoichiometric insulating film including the third element and the second element is formed; and at the setting a ratio, the ratio of the second material to the first material is set to a value of not less than the first reference value; and the ratio of the second material to the third material is set to a value of not less than the second reference value to deposit the amorphous thin film on the substrate; the first element is oxygen; the second element is any of silicon and germanium; and the third element is nitrogen.