Answer
Semiconductors are the focus of Hiroshi Amano's research. Semiconductors are materials with electrical conductivity between conductors and insulators. They are essential components in electronic devices such as transistors, diodes, and integrated circuits. Amano's work has focused on developing new semiconductor materials and devices, particularly in the field of gallium nitride (GaN). GaN is a wide-bandgap semiconductor that is well-suited for high-power and high-frequency applications.