| 摘要 |
An HBT includes an MQB between a base and a collector as a part of the collector. The MQB has an energy band structure in which the height of the effective potential barrier of the MQB increases in steps from the base to the collector. Therefore, an electric field in a region of the collector in the vicinity of the base-collector interface is relaxed and intervalley scattering of electron is suppressed, whereby reduction in electron mobility due to the intervalley scattering is suppressed, reducing the collector transit time of electron. |
