In order to contribute to energy conservation and energy creation, we are conducting research on semiconductor materials, devices, and systems from a comprehensive overview. Among these, we are working on the development of materials and crystal growth processes for “environmental semiconductors,” which are environmentally friendly semiconductors, and on the control of the physical properties of environmental semiconductors. We also work on the development of semiconductor devices that are expected to save energy. Furthermore, in order to effectively utilize the waste heat inevitably generated in any energy conversion process, we are focusing on thermoelectric conversion, and together with environmental semiconductors, we are aiming to construct a total system that includes energy storage. Based on semiconductor crystal engineering and semiconductor crystal growth technology, we will contribute to the academic field of environmental semiconductors and the development of an environmentally friendly semiconductor industry while integrating various fields.