Patent ID: 8679879

Claim:
A method for fabricating a quantum dot, the method comprising: (a) preparing a compound semiconductor layer including a quantum well structure formed by sequentially stacking a first barrier layer, a well layer and a second barrier layer; (b) forming a dielectric thin film pattern on the second barrier layer comprising: forming a resist layer on the second barrier layer; etching the resist layer to form a hole pattern that exposes a part of the second barrier layer; depositing one of a dielectric thin film selected from the group consisting of a first dielectric thin film having a thermal expansion coefficient higher than a thermal expansion coefficient of the second barrier layer and a second dielectric thin film having a thermal expansion coefficient lower than the thermal expansion coefficient of the second barrier layer on the exposed part of the second barrier layer such that the dielectric thin film has a width of nanometer size; and removing the resist layer remaining on the second barrier layer and depositing the remaining dielectric thin film selected from the group consisting of the first dielectric thin film and the second dielectric thin film on the second barrier layer; and (c) heat-treating the compound semiconductor layer formed thereon with the dielectric thin film pattern to cause an intermixing between elements of the well layer and elements of the barrier layers at a region of the compound semiconductor layer under the second dielectric thin film.