A perovskite feedstock is placed in a high-pressure cell of a high pressurehigh temperature apparatus and subjected to pressures in excess of about 2 kbar and temperatures above about 800 C. The controller of the storage apparatus includes an error correction module and a data disordering module. Where an international roaming service is executed by a user’s moving from one country to another country, the mobile terminal can automatically generate a country code or store an arbitrary phone number. The optic function subcircuit can be an optical modulator, an optical receiver or any other device that is to be operated and powered only when incident light is present.