Dual-mode size InAs/GaAs quantum dot growth method, quantum dot and quantum dot composition

The invention discloses a dual-mode size InAs/GaAs quantum dot growth method, a quantum dot and a quantum dot composition, and the method comprises the following steps: S1, setting a first temperature, and depositing InAs of n atomic layers on a GaAs substrate on which a GaAs buffer layer grows, n being greater than 1.4 and less than 1.7; s2, a second temperature is set, annealing is carried out, quantum dot crystal nucleuses are formed, and the second temperature is lower than the first temperature; and S3, at the second temperature, InAs of a 1.7-n atomic layer continues to be deposited, first quantum dots are formed by the quantum dot crystal nucleuses, second quantum dots are formed on the surface of the atomic layer between the first quantum dots when the deposition amount reaches 1.7 atomic layers, and the size of the second quantum dots is smaller than that of the first quantum dots. According to the invention, the dual-mode size is realized, and the quantum dot with an adjustable proportion between th