A semiconductor structure includes a silicon substrate, a buffer layer, a nitride-based epitaxial structure layer and multiple discontinuous strain-releasing layers. A subscriber station transmits a value generated by using an identifier and an authentication server’s public key to the authentication server through an access point. The pulse sequence is output to the at least one channel. in an N2O atmosphere while irradiating with ultraviolet light, and then carrying out a heat treatment at 300-700 C. An image-recording sheet comprising a substrate and a color-developing layer disposed by applying the image-recording composition to the substrate is also provided.